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authorsternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>2021-05-16 21:39:44 +0200
committersternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>2021-05-16 21:39:44 +0200
commit9e5896496cfd5da5754018887f7ad3b256b3ad80 (patch)
treed16fadfe61a00d589289f72f27718ea70d46a071 /pkgs/development
parentcb6ec35052306d0d78fe238852394c3976608918 (diff)
parent74b74b05550f258e9055b824eff49b15637dd917 (diff)
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Merge remote-tracking branch 'origin/master' into haskell-updates
Diffstat (limited to 'pkgs/development')
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-rw-r--r--pkgs/development/python-modules/hyperlink/default.nix11
-rw-r--r--pkgs/development/python-modules/iso8601/default.nix19
-rw-r--r--pkgs/development/python-modules/johnnycanencrypt/default.nix2
-rw-r--r--pkgs/development/python-modules/kiwisolver/1_1.nix2
-rw-r--r--pkgs/development/python-modules/kiwisolver/default.nix2
-rw-r--r--pkgs/development/python-modules/libarcus/default.nix4
-rw-r--r--pkgs/development/python-modules/libsavitar/default.nix4
-rw-r--r--pkgs/development/python-modules/llvmlite/default.nix2
-rw-r--r--pkgs/development/python-modules/matplotlib/2.nix19
-rw-r--r--pkgs/development/python-modules/matplotlib/default.nix38
-rw-r--r--pkgs/development/python-modules/matplotlib/setup-darwin.cfg7
-rw-r--r--pkgs/development/python-modules/matplotlib/setup.cfg5
-rw-r--r--pkgs/development/python-modules/meshtastic/default.nix57
-rw-r--r--pkgs/development/python-modules/numba/default.nix2
-rw-r--r--pkgs/development/python-modules/pandas/2.nix2
-rw-r--r--pkgs/development/python-modules/pandas/default.nix2
-rw-r--r--pkgs/development/python-modules/poppler-qt5/default.nix6
-rw-r--r--pkgs/development/python-modules/prison/default.nix4
-rw-r--r--pkgs/development/python-modules/py-cpuinfo/default.nix32
-rw-r--r--pkgs/development/python-modules/py-ubjson/default.nix32
-rw-r--r--pkgs/development/python-modules/py3exiv2/default.nix2
-rw-r--r--pkgs/development/python-modules/pycurl/default.nix64
-rw-r--r--pkgs/development/python-modules/pygatt/default.nix48
-rw-r--r--pkgs/development/python-modules/pykdl/default.nix4
-rw-r--r--pkgs/development/python-modules/pynest2d/default.nix4
-rw-r--r--pkgs/development/python-modules/pyqt-builder/default.nix4
-rw-r--r--pkgs/development/python-modules/pyqt/4.x.nix8
-rw-r--r--pkgs/development/python-modules/pyqt/5.x.nix4
-rw-r--r--pkgs/development/python-modules/python-engineio/3.nix2
-rw-r--r--pkgs/development/python-modules/qscintilla-qt5/default.nix4
-rw-r--r--pkgs/development/python-modules/random2/default.nix9
-rw-r--r--pkgs/development/python-modules/sip/4.x.nix44
-rw-r--r--pkgs/development/python-modules/sip/5.x.nix40
-rw-r--r--pkgs/development/python-modules/sip/default.nix56
-rw-r--r--pkgs/development/python-modules/sphinx/default.nix96
-rw-r--r--pkgs/development/python-modules/timeago/default.nix32
-rw-r--r--pkgs/development/python-modules/txaio/default.nix51
-rw-r--r--pkgs/development/r-modules/generic-builder.nix2
-rw-r--r--pkgs/development/tools/analysis/include-what-you-use/default.nix6
-rw-r--r--pkgs/development/tools/boomerang/default.nix12
-rw-r--r--pkgs/development/tools/build-managers/bazel/bazel_3/default.nix2
-rw-r--r--pkgs/development/tools/build-managers/bazel/bazel_4/default.nix2
-rw-r--r--pkgs/development/tools/castxml/default.nix7
-rw-r--r--pkgs/development/tools/documentation/gtk-doc/default.nix7
-rw-r--r--pkgs/development/tools/irony-server/default.nix2
-rw-r--r--pkgs/development/tools/luaformatter/default.nix4
-rw-r--r--pkgs/development/tools/misc/binutils/default.nix17
-rw-r--r--pkgs/development/tools/misc/ccls/default.nix4
-rw-r--r--pkgs/development/tools/misc/creduce/default.nix6
-rw-r--r--pkgs/development/tools/misc/cvise/default.nix6
-rw-r--r--pkgs/development/tools/misc/gdb/default.nix10
-rw-r--r--pkgs/development/tools/parinfer-rust/default.nix2
-rw-r--r--pkgs/development/tools/parsing/re2c/default.nix40
-rw-r--r--pkgs/development/tools/poetry2nix/poetry2nix/overrides.nix2
-rw-r--r--pkgs/development/tools/qtcreator/default.nix2
-rw-r--r--pkgs/development/tools/rq/default.nix4
-rw-r--r--pkgs/development/tools/rtags/default.nix4
-rw-r--r--pkgs/development/tools/rust/bindgen/default.nix2
-rw-r--r--pkgs/development/tools/rust/cbindgen/default.nix2
-rw-r--r--pkgs/development/web/nodejs/v12.nix4
-rw-r--r--pkgs/development/web/nodejs/v14.nix4
-rw-r--r--pkgs/development/web/nodejs/v15.nix4
317 files changed, 11771 insertions, 1579 deletions
diff --git a/pkgs/development/compilers/adoptopenjdk-bin/jdk-darwin-base.nix b/pkgs/development/compilers/adoptopenjdk-bin/jdk-darwin-base.nix
index 262e52c2521..71a55c68290 100644
--- a/pkgs/development/compilers/adoptopenjdk-bin/jdk-darwin-base.nix
+++ b/pkgs/development/compilers/adoptopenjdk-bin/jdk-darwin-base.nix
@@ -3,6 +3,7 @@
 { swingSupport ? true # not used for now
 , lib, stdenv
 , fetchurl
+, setJavaClassPath
 }:
 
 let cpuName = stdenv.hostPlatform.parsed.cpu.name;
@@ -30,7 +31,11 @@ let cpuName = stdenv.hostPlatform.parsed.cpu.name;
 
     ln -s $out/Contents/Home/* $out/
 
+    # Propagate the setJavaClassPath setup hook from the JDK so that
+    # any package that depends on the JDK has $CLASSPATH set up
+    # properly.
     mkdir -p $out/nix-support
+    printWords ${setJavaClassPath} > $out/nix-support/propagated-build-inputs
 
     # Set JAVA_HOME automatically.
     cat <<EOF >> $out/nix-support/setup-hook
diff --git a/pkgs/development/compilers/adoptopenjdk-bin/jdk-linux-base.nix b/pkgs/development/compilers/adoptopenjdk-bin/jdk-linux-base.nix
index a433a2f1321..e304f67bd75 100644
--- a/pkgs/development/compilers/adoptopenjdk-bin/jdk-linux-base.nix
+++ b/pkgs/development/compilers/adoptopenjdk-bin/jdk-linux-base.nix
@@ -5,6 +5,7 @@
 , fetchurl
 , autoPatchelfHook
 , makeWrapper
+, setJavaClassPath
 # minimum dependencies
 , alsaLib
 , fontconfig
@@ -74,7 +75,11 @@ let result = stdenv.mkDerivation rec {
     # https://github.com/NixOS/nixpkgs/issues/57733
     find "$out" -name 'libfreetype.so*' -delete
 
+    # Propagate the setJavaClassPath setup hook from the JDK so that
+    # any package that depends on the JDK has $CLASSPATH set up
+    # properly.
     mkdir -p $out/nix-support
+    printWords ${setJavaClassPath} > $out/nix-support/propagated-build-inputs
 
     # Set JAVA_HOME automatically.
     cat <<EOF >> "$out/nix-support/setup-hook"
diff --git a/pkgs/development/compilers/crystal/default.nix b/pkgs/development/compilers/crystal/default.nix
index 58e4b3b355d..8fc4a15efce 100644
--- a/pkgs/development/compilers/crystal/default.nix
+++ b/pkgs/development/compilers/crystal/default.nix
@@ -146,7 +146,7 @@ let
         "CRYSTAL_CONFIG_VERSION=${version}"
       ];
 
-      LLVM_CONFIG = "${llvmPackages.llvm}/bin/llvm-config";
+      LLVM_CONFIG = "${llvmPackages.llvm.dev}/bin/llvm-config";
 
       FLAGS = [
         "--release"
diff --git a/pkgs/development/compilers/dale/default.nix b/pkgs/development/compilers/dale/default.nix
index addd7997d36..bf02d623e52 100644
--- a/pkgs/development/compilers/dale/default.nix
+++ b/pkgs/development/compilers/dale/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation {
     sha256 = "0v4ajrzrqvf279kd7wsd9flrpsav57lzxlwwimk9vnfwh7xpzf9v";
   };
 
-  nativeBuildInputs = [ cmake pkg-config ];
+  nativeBuildInputs = [ cmake pkg-config llvm_6.dev ];
   buildInputs = [ libffi llvm_6 ];
 
   inherit doCheck;
diff --git a/pkgs/development/compilers/gcc/10/default.nix b/pkgs/development/compilers/gcc/10/default.nix
index 1502b09cca6..2f7991a9212 100644
--- a/pkgs/development/compilers/gcc/10/default.nix
+++ b/pkgs/development/compilers/gcc/10/default.nix
@@ -4,6 +4,7 @@
 , langObjC ? stdenv.targetPlatform.isDarwin
 , langObjCpp ? stdenv.targetPlatform.isDarwin
 , langGo ? false
+, reproducibleBuild ? true
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
@@ -48,11 +49,15 @@ assert langAda -> gnatboot != null;
 # threadsCross is just for MinGW
 assert threadsCross != null -> stdenv.targetPlatform.isWindows;
 
+# profiledCompiler builds inject non-determinism in one of the compilation stages.
+# If turned on, we can't provide reproducible builds anymore
+assert reproducibleBuild -> profiledCompiler == false;
+
 with lib;
 with builtins;
 
 let majorVersion = "10";
-    version = "${majorVersion}.2.0";
+    version = "${majorVersion}.3.0";
 
     inherit (stdenv) buildPlatform hostPlatform targetPlatform;
 
@@ -85,7 +90,7 @@ stdenv.mkDerivation ({
 
   src = fetchurl {
     url = "mirror://gcc/releases/gcc-${version}/gcc-${version}.tar.xz";
-    sha256 = "130xdkhmz1bc2kzx061s3sfwk36xah1fw5w332c0nzwwpdl47pdq";
+    sha256 = "0i6378ig6h397zkhd7m4ccwjx5alvzrf2hm27p1pzwjhlv0h9x34";
   };
 
   inherit patches;
@@ -186,8 +191,7 @@ stdenv.mkDerivation ({
 
   dontDisableStatic = true;
 
-  # TODO(@Ericson2314): Always pass "--target" and always prefix.
-  configurePlatforms = [ "build" "host" ] ++ lib.optional (targetPlatform != hostPlatform) "target";
+  configurePlatforms = [ "build" "host" "target" ];
 
   configureFlags = import ../common/configure-flags.nix {
     inherit
diff --git a/pkgs/development/compilers/gcc/4.8/default.nix b/pkgs/development/compilers/gcc/4.8/default.nix
index 6a2121a8298..4ed41ba3ca1 100644
--- a/pkgs/development/compilers/gcc/4.8/default.nix
+++ b/pkgs/development/compilers/gcc/4.8/default.nix
@@ -4,6 +4,7 @@
 , langObjCpp ? stdenv.targetPlatform.isDarwin
 , langJava ? false
 , langGo ? false
+, reproducibleBuild ? true
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
@@ -58,6 +59,10 @@ assert langGo -> langCC;
 # threadsCross is just for MinGW
 assert threadsCross != null -> stdenv.targetPlatform.isWindows;
 
+# profiledCompiler builds inject non-determinism in one of the compilation stages.
+# If turned on, we can't provide reproducible builds anymore
+assert reproducibleBuild -> profiledCompiler == false;
+
 with lib;
 with builtins;
 
@@ -196,8 +201,7 @@ stdenv.mkDerivation ({
 
   dontDisableStatic = true;
 
-  # TODO(@Ericson2314): Always pass "--target" and always prefix.
-  configurePlatforms = [ "build" "host" ] ++ lib.optional (targetPlatform != hostPlatform) "target";
+  configurePlatforms = [ "build" "host" "target" ];
 
   configureFlags = import ../common/configure-flags.nix {
     inherit
diff --git a/pkgs/development/compilers/gcc/4.9/default.nix b/pkgs/development/compilers/gcc/4.9/default.nix
index 709288559d1..0eb0a85eaff 100644
--- a/pkgs/development/compilers/gcc/4.9/default.nix
+++ b/pkgs/development/compilers/gcc/4.9/default.nix
@@ -4,6 +4,7 @@
 , langObjCpp ? stdenv.targetPlatform.isDarwin
 , langJava ? false
 , langGo ? false
+, reproducibleBuild ? true
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
@@ -58,6 +59,10 @@ assert langGo -> langCC;
 # threadsCross is just for MinGW
 assert threadsCross != null -> stdenv.targetPlatform.isWindows;
 
+# profiledCompiler builds inject non-determinism in one of the compilation stages.
+# If turned on, we can't provide reproducible builds anymore
+assert reproducibleBuild -> profiledCompiler == false;
+
 with lib;
 with builtins;
 
@@ -209,8 +214,7 @@ stdenv.mkDerivation ({
 
   dontDisableStatic = true;
 
-  # TODO(@Ericson2314): Always pass "--target" and always prefix.
-  configurePlatforms = [ "build" "host" ] ++ lib.optional (targetPlatform != hostPlatform) "target";
+  configurePlatforms = [ "build" "host" "target" ];
 
   configureFlags = import ../common/configure-flags.nix {
     inherit
diff --git a/pkgs/development/compilers/gcc/6/default.nix b/pkgs/development/compilers/gcc/6/default.nix
index 93c9dde61fc..32a4ad0dd09 100644
--- a/pkgs/development/compilers/gcc/6/default.nix
+++ b/pkgs/development/compilers/gcc/6/default.nix
@@ -5,6 +5,7 @@
 , langObjCpp ? stdenv.targetPlatform.isDarwin
 , langJava ? false
 , langGo ? false
+, reproducibleBuild ? true
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
@@ -61,6 +62,10 @@ assert langAda -> gnatboot != null;
 # threadsCross is just for MinGW
 assert threadsCross != null -> stdenv.targetPlatform.isWindows;
 
+# profiledCompiler builds inject non-determinism in one of the compilation stages.
+# If turned on, we can't provide reproducible builds anymore
+assert reproducibleBuild -> profiledCompiler == false;
+
 with lib;
 with builtins;
 
@@ -232,8 +237,7 @@ stdenv.mkDerivation ({
 
   dontDisableStatic = true;
 
-  # TODO(@Ericson2314): Always pass "--target" and always prefix.
-  configurePlatforms = [ "build" "host" ] ++ lib.optional (targetPlatform != hostPlatform) "target";
+  configurePlatforms = [ "build" "host" "target" ];
 
   configureFlags = import ../common/configure-flags.nix {
     inherit
diff --git a/pkgs/development/compilers/gcc/7/default.nix b/pkgs/development/compilers/gcc/7/default.nix
index d9b4c639b5a..33edc81ce53 100644
--- a/pkgs/development/compilers/gcc/7/default.nix
+++ b/pkgs/development/compilers/gcc/7/default.nix
@@ -3,6 +3,7 @@
 , langObjC ? stdenv.targetPlatform.isDarwin
 , langObjCpp ? stdenv.targetPlatform.isDarwin
 , langGo ? false
+, reproducibleBuild ? true
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
@@ -45,6 +46,10 @@ assert langGo -> langCC;
 # threadsCross is just for MinGW
 assert threadsCross != null -> stdenv.targetPlatform.isWindows;
 
+# profiledCompiler builds inject non-determinism in one of the compilation stages.
+# If turned on, we can't provide reproducible builds anymore
+assert reproducibleBuild -> profiledCompiler == false;
+
 with lib;
 with builtins;
 
@@ -197,8 +202,7 @@ stdenv.mkDerivation ({
 
   dontDisableStatic = true;
 
-  # TODO(@Ericson2314): Always pass "--target" and always prefix.
-  configurePlatforms = [ "build" "host" ] ++ lib.optional (targetPlatform != hostPlatform) "target";
+  configurePlatforms = [ "build" "host" "target" ];
 
   configureFlags = import ../common/configure-flags.nix {
     inherit
diff --git a/pkgs/development/compilers/gcc/8/default.nix b/pkgs/development/compilers/gcc/8/default.nix
index 4edc034720c..dae98afccb9 100644
--- a/pkgs/development/compilers/gcc/8/default.nix
+++ b/pkgs/development/compilers/gcc/8/default.nix
@@ -3,6 +3,7 @@
 , langObjC ? stdenv.targetPlatform.isDarwin
 , langObjCpp ? stdenv.targetPlatform.isDarwin
 , langGo ? false
+, reproducibleBuild ? true
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
@@ -45,6 +46,10 @@ assert langGo -> langCC;
 # threadsCross is just for MinGW
 assert threadsCross != null -> stdenv.targetPlatform.isWindows;
 
+# profiledCompiler builds inject non-determinism in one of the compilation stages.
+# If turned on, we can't provide reproducible builds anymore
+assert reproducibleBuild -> profiledCompiler == false;
+
 with lib;
 with builtins;
 
@@ -183,8 +188,7 @@ stdenv.mkDerivation ({
 
   dontDisableStatic = true;
 
-  # TODO(@Ericson2314): Always pass "--target" and always prefix.
-  configurePlatforms = [ "build" "host" ] ++ lib.optional (targetPlatform != hostPlatform) "target";
+  configurePlatforms = [ "build" "host" "target" ];
 
   configureFlags = import ../common/configure-flags.nix {
     inherit
diff --git a/pkgs/development/compilers/gcc/9/default.nix b/pkgs/development/compilers/gcc/9/default.nix
index ca92a8f4845..ebe20e0cba5 100644
--- a/pkgs/development/compilers/gcc/9/default.nix
+++ b/pkgs/development/compilers/gcc/9/default.nix
@@ -5,6 +5,7 @@
 , langObjCpp ? stdenv.targetPlatform.isDarwin
 , langD ? false
 , langGo ? false
+, reproducibleBuild ? true
 , profiledCompiler ? false
 , langJit ? false
 , staticCompiler ? false
@@ -54,6 +55,10 @@ assert langAda -> gnatboot != null;
 # threadsCross is just for MinGW
 assert threadsCross != null -> stdenv.targetPlatform.isWindows;
 
+# profiledCompiler builds inject non-determinism in one of the compilation stages.
+# If turned on, we can't provide reproducible builds anymore
+assert reproducibleBuild -> profiledCompiler == false;
+
 with lib;
 with builtins;
 
@@ -200,8 +205,7 @@ stdenv.mkDerivation ({
 
   dontDisableStatic = true;
 
-  # TODO(@Ericson2314): Always pass "--target" and always prefix.
-  configurePlatforms = [ "build" "host" ] ++ lib.optional (targetPlatform != hostPlatform) "target";
+  configurePlatforms = [ "build" "host" "target" ];
 
   configureFlags = import ../common/configure-flags.nix {
     inherit
diff --git a/pkgs/development/compilers/gcc/common/configure-flags.nix b/pkgs/development/compilers/gcc/common/configure-flags.nix
index 7f7a40f3368..42deb970dfe 100644
--- a/pkgs/development/compilers/gcc/common/configure-flags.nix
+++ b/pkgs/development/compilers/gcc/common/configure-flags.nix
@@ -44,6 +44,9 @@ let
   crossMingw = targetPlatform != hostPlatform && targetPlatform.libc == "msvcrt";
   crossDarwin = targetPlatform != hostPlatform && targetPlatform.libc == "libSystem";
 
+  targetPrefix = lib.optionalString (stdenv.targetPlatform != stdenv.hostPlatform)
+                  "${stdenv.targetPlatform.config}-";
+
   crossConfigureFlags =
     # Ensure that -print-prog-name is able to find the correct programs.
     [
@@ -112,6 +115,18 @@ let
 
     # Basic configuration
     ++ [
+      # Force target prefix. The behavior if `--target` and `--host`
+      # are specified is inconsistent: Sometimes specifying `--target`
+      # always causes a prefix to be generated, sometimes it's only
+      # added if the `--host` and `--target` differ. This means that
+      # sometimes there may be a prefix even though nixpkgs doesn't
+      # expect one and sometimes there may be none even though nixpkgs
+      # expects one (since not all information is serialized into the
+      # config attribute). The easiest way out of these problems is to
+      # always set the program prefix, so gcc will conform to our
+      # expectations.
+      "--program-prefix=${targetPrefix}"
+
       (lib.enableFeature enableLTO "lto")
       "--disable-libstdcxx-pch"
       "--without-included-gettext"
diff --git a/pkgs/development/compilers/ghdl/default.nix b/pkgs/development/compilers/ghdl/default.nix
index ec07331dc52..e7886eb8f5e 100644
--- a/pkgs/development/compilers/ghdl/default.nix
+++ b/pkgs/development/compilers/ghdl/default.nix
@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
   '';
 
   configureFlags = [ "--enable-synth" ] ++ lib.optional (backend == "llvm")
-    "--with-llvm-config=${llvm}/bin/llvm-config";
+    "--with-llvm-config=${llvm.dev}/bin/llvm-config";
 
   hardeningDisable = [ "format" ];
 
diff --git a/pkgs/development/compilers/intel-graphics-compiler/default.nix b/pkgs/development/compilers/intel-graphics-compiler/default.nix
index 51286582960..75687de4e9e 100644
--- a/pkgs/development/compilers/intel-graphics-compiler/default.nix
+++ b/pkgs/development/compilers/intel-graphics-compiler/default.nix
@@ -18,7 +18,7 @@ let
     inherit spirv-llvm-translator;
   };
   inherit (llvmPkgs) llvm;
-  inherit (if buildWithPatches then opencl-clang else llvmPkgs) clang clang-unwrapped spirv-llvm-translator;
+  inherit (if buildWithPatches then opencl-clang else llvmPkgs) clang libclang spirv-llvm-translator;
   inherit (lib) getVersion optional optionals versionOlder versions;
 in
 
@@ -55,7 +55,7 @@ stdenv.mkDerivation rec {
       ln -s ${clang}/bin/clang $out/
       ln -s clang $out/clang-${versions.major (getVersion clang)}
       ln -s ${opencl-clang}/lib/* $out/
-      ln -s ${clang-unwrapped}/lib/clang/${getVersion clang}/include/opencl-c.h $out/
+      ln -s ${lib.getLib libclang}/lib/clang/${getVersion clang}/include/opencl-c.h $out/
     '';
   };
 
diff --git a/pkgs/development/compilers/ispc/default.nix b/pkgs/development/compilers/ispc/default.nix
index fd748158711..bbe17e0755c 100644
--- a/pkgs/development/compilers/ispc/default.nix
+++ b/pkgs/development/compilers/ispc/default.nix
@@ -28,10 +28,9 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  nativeBuildInputs = [ cmake which m4 bison flex python3 ];
+  nativeBuildInputs = [ cmake which m4 bison flex python3 llvmPackages.llvm.dev ];
   buildInputs = with llvmPackages; [
-    # we need to link against libclang, so we need the unwrapped
-    llvm llvmPackages.clang-unwrapped
+    llvm llvmPackages.libclang
   ];
 
   postPatch = ''
@@ -66,6 +65,7 @@ stdenv.mkDerivation rec {
   '';
 
   cmakeFlags = [
+    "-DLLVM_CONFIG_EXECUTABLE=${llvmPackages.llvm.dev}/bin/llvm-config"
     "-DCLANG_EXECUTABLE=${llvmPackages.clang}/bin/clang"
     "-DCLANGPP_EXECUTABLE=${llvmPackages.clang}/bin/clang++"
     "-DISPC_INCLUDE_EXAMPLES=OFF"
diff --git a/pkgs/development/compilers/ldc/generic.nix b/pkgs/development/compilers/ldc/generic.nix
index 4261c2b6533..f79fb24a56b 100644
--- a/pkgs/development/compilers/ldc/generic.nix
+++ b/pkgs/development/compilers/ldc/generic.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
   '';
 
   nativeBuildInputs = [
-    cmake ldcBootstrap lit lit.python llvm_11 makeWrapper ninja unzip
+    cmake ldcBootstrap lit lit.python llvm_11.dev makeWrapper ninja unzip
   ]
   ++ lib.optionals stdenv.hostPlatform.isDarwin [
     darwin.apple_sdk.frameworks.Foundation
diff --git a/pkgs/development/compilers/llvm/10/clang/default.nix b/pkgs/development/compilers/llvm/10/clang/default.nix
index 35b7ab313d8..d228c4261af 100644
--- a/pkgs/development/compilers/llvm/10/clang/default.nix
+++ b/pkgs/development/compilers/llvm/10/clang/default.nix
@@ -1,4 +1,5 @@
-{ lib, stdenv, fetch, cmake, libxml2, llvm, version, clang-tools-extra_src, python3, lld
+{ lib, stdenv, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+, buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
 }:
@@ -18,28 +19,33 @@ let
       mv clang-tools-extra-* $sourceRoot/tools/extra
     '';
 
-    nativeBuildInputs = [ cmake python3 lld ]
+    nativeBuildInputs = [ cmake python3 ]
       ++ lib.optional enableManpages python3.pkgs.sphinx
       ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-    buildInputs = [ libxml2 llvm ];
+    buildInputs = [ libxml2 libllvm ];
 
     cmakeFlags = [
       "-DCMAKE_CXX_FLAGS=-std=c++14"
       "-DCLANGD_BUILD_XPC=OFF"
       "-DLLVM_ENABLE_RTTI=ON"
+      "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
     ] ++ lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"
       "-DSPHINX_OUTPUT_MAN=ON"
       "-DSPHINX_OUTPUT_HTML=OFF"
       "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
     ];
 
     patches = [
       ./purity.patch
       # https://reviews.llvm.org/D51899
       ./compiler-rt-baremetal.patch
+      ./gnu-install-dirs.patch
     ];
 
     postPatch = ''
@@ -56,12 +62,12 @@ let
         --replace "NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB" FALSE
     '';
 
-    outputs = [ "out" "lib" "python" ];
+    outputs = [ "out" "lib" "dev" "python" ];
 
     # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${llvm}/lib/LLVMgold.so ]; then
-        ln -sv ${llvm}/lib/LLVMgold.so $out/lib
+      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
+        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
       fi
 
       ln -sv $out/bin/clang $out/bin/cpp
@@ -80,11 +86,14 @@ let
       fi
       mv $out/share/clang/*.py $python/share/clang
       rm $out/bin/c-index-test
+
+      mkdir -p $dev/bin
+      cp bin/clang-tblgen $dev/bin
     '';
 
     passthru = {
       isClang = true;
-      inherit llvm;
+      inherit libllvm;
     };
 
     meta = {
diff --git a/pkgs/development/compilers/llvm/10/clang/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/10/clang/gnu-install-dirs.patch
new file mode 100644
index 00000000000..454c81875ea
--- /dev/null
+++ b/pkgs/development/compilers/llvm/10/clang/gnu-install-dirs.patch
@@ -0,0 +1,248 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index dc1413f4b597..c173531e624f 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -9,6 +9,8 @@ endif()
+ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
+   project(Clang)
+ 
++  include(GNUInstallDirs)
++
+   # Rely on llvm-config.
+   set(CONFIG_OUTPUT)
+   if(LLVM_CONFIG)
+@@ -417,7 +419,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/clang include/clang-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -427,7 +429,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "CMakeFiles" EXCLUDE
+@@ -447,7 +449,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   add_custom_target(bash-autocomplete DEPENDS utils/bash-autocomplete.sh)
+   install(PROGRAMS utils/bash-autocomplete.sh
+-          DESTINATION share/clang
++          DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+           COMPONENT bash-autocomplete)
+   if(NOT LLVM_ENABLE_IDE)
+     add_llvm_install_targets(install-bash-autocomplete
+diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
+index 577cc11ab015..a4f4481d8442 100644
+--- a/cmake/modules/AddClang.cmake
++++ b/cmake/modules/AddClang.cmake
+@@ -114,9 +114,9 @@ macro(add_clang_library name)
+       install(TARGETS ${name}
+         COMPONENT ${name}
+         ${export_to_clangtargets}
+-        LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        RUNTIME DESTINATION bin)
++        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+       if (NOT LLVM_ENABLE_IDE)
+         add_llvm_install_targets(install-${name}
+@@ -160,7 +160,7 @@ macro(add_clang_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_clangtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT LLVM_ENABLE_IDE)
+@@ -175,7 +175,7 @@ endmacro()
+ macro(add_clang_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+ 
+ function(clang_target_link_libraries target type)
+diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
+index 85c3124234ad..64c48235d914 100644
+--- a/lib/Headers/CMakeLists.txt
++++ b/lib/Headers/CMakeLists.txt
+@@ -191,7 +191,7 @@ set_target_properties(clang-resource-headers PROPERTIES
+   FOLDER "Misc"
+   RUNTIME_OUTPUT_DIRECTORY "${output_dir}")
+ 
+-set(header_install_dir lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++set(header_install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ install(
+   FILES ${files} ${generated_files}
+diff --git a/tools/c-index-test/CMakeLists.txt b/tools/c-index-test/CMakeLists.txt
+index ceef4b08637c..8efad5520ca4 100644
+--- a/tools/c-index-test/CMakeLists.txt
++++ b/tools/c-index-test/CMakeLists.txt
+@@ -54,7 +54,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
+        "@executable_path/../../lib")
+   else()
+-    set(INSTALL_DESTINATION bin)
++    set(INSTALL_DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endif()
+ 
+   install(TARGETS c-index-test
+diff --git a/tools/clang-format/CMakeLists.txt b/tools/clang-format/CMakeLists.txt
+index 35ecdb11253c..d77d75de0094 100644
+--- a/tools/clang-format/CMakeLists.txt
++++ b/tools/clang-format/CMakeLists.txt
+@@ -21,20 +21,20 @@ if( LLVM_LIB_FUZZING_ENGINE OR LLVM_USE_SANITIZE_COVERAGE )
+ endif()
+ 
+ install(PROGRAMS clang-format-bbedit.applescript
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-diff.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-sublime.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS git-clang-format
+-  DESTINATION bin
++  DESTINATION ${CMAKE_INSTALL_BINDIR}
+   COMPONENT clang-format)
+diff --git a/tools/clang-rename/CMakeLists.txt b/tools/clang-rename/CMakeLists.txt
+index cda8e29ec5b1..0134d8ccd70b 100644
+--- a/tools/clang-rename/CMakeLists.txt
++++ b/tools/clang-rename/CMakeLists.txt
+@@ -19,8 +19,8 @@ clang_target_link_libraries(clang-rename
+   )
+ 
+ install(PROGRAMS clang-rename.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+ install(PROGRAMS clang-rename.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+diff --git a/tools/diagtool/CMakeLists.txt b/tools/diagtool/CMakeLists.txt
+index a95444be40ee..136d96d9bf5b 100644
+--- a/tools/diagtool/CMakeLists.txt
++++ b/tools/diagtool/CMakeLists.txt
+@@ -21,7 +21,7 @@ clang_target_link_libraries(diagtool
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(TARGETS diagtool
+     COMPONENT diagtool
+-    RUNTIME DESTINATION bin)
++    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+   if (NOT LLVM_ENABLE_IDE)
+     add_llvm_install_targets(install-diagtool
+diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
+index 973655361f71..0181002e4e3b 100644
+--- a/tools/libclang/CMakeLists.txt
++++ b/tools/libclang/CMakeLists.txt
+@@ -141,7 +141,7 @@ endif()
+ if(INTERNAL_INSTALL_PREFIX)
+   set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
+ else()
+-  set(LIBCLANG_HEADERS_INSTALL_DESTINATION include)
++  set(LIBCLANG_HEADERS_INSTALL_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+ endif()
+ 
+ install(DIRECTORY ../../include/clang-c
+@@ -172,7 +172,7 @@ foreach(PythonVersion ${CLANG_PYTHON_BINDINGS_VERSIONS})
+           COMPONENT
+             libclang-python-bindings
+           DESTINATION
+-            "lib${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
++            "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
+ endforeach()
+ if(NOT LLVM_ENABLE_IDE)
+   add_custom_target(libclang-python-bindings)
+diff --git a/tools/scan-build/CMakeLists.txt b/tools/scan-build/CMakeLists.txt
+index 28241245fcb7..d6b59f02fc2a 100644
+--- a/tools/scan-build/CMakeLists.txt
++++ b/tools/scan-build/CMakeLists.txt
+@@ -42,7 +42,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+     install(PROGRAMS bin/${BinFile}
+-            DESTINATION bin
++            DESTINATION ${CMAKE_INSTALL_BINDIR}
+             COMPONENT scan-build)
+   endforeach()
+ 
+@@ -56,7 +56,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libexec/${LibexecFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/libexec/${LibexecFile})
+     install(PROGRAMS libexec/${LibexecFile}
+-            DESTINATION libexec
++            DESTINATION ${CMAKE_INSTALL_LIBEXECDIR}
+             COMPONENT scan-build)
+   endforeach()
+ 
+@@ -84,7 +84,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/scan-build/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-build/${ShareFile})
+     install(FILES share/scan-build/${ShareFile}
+-            DESTINATION share/scan-build
++            DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-build
+             COMPONENT scan-build)
+   endforeach()
+ 
+diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
+index 22edb974bac7..9f140a9a4538 100644
+--- a/tools/scan-view/CMakeLists.txt
++++ b/tools/scan-view/CMakeLists.txt
+@@ -22,7 +22,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+     install(PROGRAMS bin/${BinFile}
+-            DESTINATION bin
++            DESTINATION ${CMAKE_INSTALL_BINDIR}
+             COMPONENT scan-view)
+   endforeach()
+ 
+@@ -36,7 +36,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-view/${ShareFile})
+     install(FILES share/${ShareFile}
+-            DESTINATION share/scan-view
++            DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-view
+             COMPONENT scan-view)
+   endforeach()
+ 
+diff --git a/utils/hmaptool/CMakeLists.txt b/utils/hmaptool/CMakeLists.txt
+index 62f2de0cb15c..6aa66825b6ec 100644
+--- a/utils/hmaptool/CMakeLists.txt
++++ b/utils/hmaptool/CMakeLists.txt
+@@ -10,7 +10,7 @@ add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HM
+ 
+ list(APPEND Depends ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HMAPTOOL})
+ install(PROGRAMS ${CLANG_HMAPTOOL}
+-        DESTINATION bin
++        DESTINATION ${CMAKE_INSTALL_BINDIR}
+         COMPONENT hmaptool)
+ 
+ add_custom_target(hmaptool ALL DEPENDS ${Depends})
diff --git a/pkgs/development/compilers/llvm/10/compiler-rt/default.nix b/pkgs/development/compilers/llvm/10/compiler-rt/default.nix
index 1d759c903fc..1f990ac433d 100644
--- a/pkgs/development/compilers/llvm/10/compiler-rt/default.nix
+++ b/pkgs/development/compilers/llvm/10/compiler-rt/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   inherit version;
   src = fetch pname "1yjqjri753w0fzmxcyz687nvd97sbc9rsqrxzpq720na47hwh3fr";
 
-  nativeBuildInputs = [ cmake python3 llvm ];
+  nativeBuildInputs = [ cmake python3 llvm.dev ];
   buildInputs = lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
   NIX_CFLAGS_COMPILE = [
@@ -54,6 +54,7 @@ stdenv.mkDerivation rec {
   patches = [
     ./codesign.patch # Revert compiler-rt commit that makes codesign mandatory
     ./find-darwin-sdk-version.patch # don't test for macOS being >= 10.15
+    ./gnu-install-dirs.patch
   ]# ++ lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
     ++ lib.optional stdenv.hostPlatform.isAarch32 ./armv7l.patch;
 
diff --git a/pkgs/development/compilers/llvm/10/compiler-rt/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/10/compiler-rt/gnu-install-dirs.patch
new file mode 100644
index 00000000000..db0bd006eaf
--- /dev/null
+++ b/pkgs/development/compilers/llvm/10/compiler-rt/gnu-install-dirs.patch
@@ -0,0 +1,129 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 8d768a404f21..74551dc5a004 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -12,6 +12,7 @@ endif()
+ # Check if compiler-rt is built as a standalone project.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR COMPILER_RT_STANDALONE_BUILD)
+   project(CompilerRT C CXX ASM)
++  include(GNUInstallDirs)
+   set(COMPILER_RT_STANDALONE_BUILD TRUE)
+   set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+ endif()
+diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake
+index 35a48c6af29c..e4300f256091 100644
+--- a/cmake/Modules/AddCompilerRT.cmake
++++ b/cmake/Modules/AddCompilerRT.cmake
+@@ -493,7 +493,7 @@ macro(add_compiler_rt_resource_file target_name file_name component)
+   add_custom_target(${target_name} DEPENDS ${dst_file})
+   # Install in Clang resource directory.
+   install(FILES ${file_name}
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/share
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_DATADIR}
+     COMPONENT ${component})
+   add_dependencies(${component} ${target_name})
+ 
+@@ -510,7 +510,7 @@ macro(add_compiler_rt_script name)
+   add_custom_target(${name} DEPENDS ${dst})
+   install(FILES ${dst}
+     PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/bin)
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_BINDIR})
+ endmacro(add_compiler_rt_script src name)
+ 
+ # Builds custom version of libc++ and installs it in <prefix>.
+diff --git a/cmake/Modules/CompilerRTDarwinUtils.cmake b/cmake/Modules/CompilerRTDarwinUtils.cmake
+index 9f501a61c4b6..f9a0d92dbca0 100644
+--- a/cmake/Modules/CompilerRTDarwinUtils.cmake
++++ b/cmake/Modules/CompilerRTDarwinUtils.cmake
+@@ -440,7 +440,7 @@ macro(darwin_add_embedded_builtin_libraries)
+     set(DARWIN_macho_embedded_LIBRARY_OUTPUT_DIR
+       ${COMPILER_RT_OUTPUT_DIR}/lib/macho_embedded)
+     set(DARWIN_macho_embedded_LIBRARY_INSTALL_DIR
+-      ${COMPILER_RT_INSTALL_PATH}/lib/macho_embedded)
++      ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/macho_embedded)
+       
+     set(CFLAGS_armv7 "-target thumbv7-apple-darwin-eabi")
+     set(CFLAGS_i386 "-march=pentium")
+diff --git a/cmake/Modules/CompilerRTUtils.cmake b/cmake/Modules/CompilerRTUtils.cmake
+index 6e672b1e1818..64999709958e 100644
+--- a/cmake/Modules/CompilerRTUtils.cmake
++++ b/cmake/Modules/CompilerRTUtils.cmake
+@@ -371,7 +371,7 @@ endfunction()
+ function(get_compiler_rt_install_dir arch install_dir)
+   if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+     get_compiler_rt_target(${arch} target)
+-    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/lib/${target} PARENT_SCOPE)
++    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${target} PARENT_SCOPE)
+   else()
+     set(${install_dir} ${COMPILER_RT_LIBRARY_INSTALL_DIR} PARENT_SCOPE)
+   endif()
+diff --git a/cmake/base-config-ix.cmake b/cmake/base-config-ix.cmake
+index b4b87aa53073..f1ae8668837c 100644
+--- a/cmake/base-config-ix.cmake
++++ b/cmake/base-config-ix.cmake
+@@ -65,11 +65,11 @@ if (LLVM_TREE_AVAILABLE)
+ else()
+     # Take output dir and install path from the user.
+   set(COMPILER_RT_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH
+-    "Path where built compiler-rt libraries should be stored.")
++    "Path where built compiler-rt build artifacts should be stored.")
+   set(COMPILER_RT_EXEC_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/bin CACHE PATH
+     "Path where built compiler-rt executables should be stored.")
+-  set(COMPILER_RT_INSTALL_PATH ${CMAKE_INSTALL_PREFIX} CACHE PATH
+-    "Path where built compiler-rt libraries should be installed.")
++  set(COMPILER_RT_INSTALL_PATH "" CACHE PATH
++    "Prefix where built compiler-rt artifacts should be installed, comes before CMAKE_INSTALL_PREFIX.")
+   option(COMPILER_RT_INCLUDE_TESTS "Generate and build compiler-rt unit tests." OFF)
+   option(COMPILER_RT_ENABLE_WERROR "Fail and stop if warning is triggered" OFF)
+   # Use a host compiler to compile/link tests.
+@@ -97,7 +97,7 @@ else(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
+   set(COMPILER_RT_LIBRARY_OUTPUT_DIR
+     ${COMPILER_RT_OUTPUT_DIR}/lib/${COMPILER_RT_OS_DIR})
+   set(COMPILER_RT_LIBRARY_INSTALL_DIR
+-    ${COMPILER_RT_INSTALL_PATH}/lib/${COMPILER_RT_OS_DIR})
++    ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${COMPILER_RT_OS_DIR})
+ endif()
+ 
+ if(APPLE)
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index d47d7baeb118..507c8e5c713e 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -62,22 +62,22 @@ set_target_properties(compiler-rt-headers PROPERTIES FOLDER "Compiler-RT Misc")
+ install(FILES ${SANITIZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/sanitizer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/sanitizer)
+ # Install fuzzer headers.
+ install(FILES ${FUZZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/fuzzer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/fuzzer)
+ # Install xray headers.
+ install(FILES ${XRAY_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/xray)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/xray)
+ # Install profile headers.
+ install(FILES ${PROFILE_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/profile)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/profile)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDEs.
+   add_custom_target(install-compiler-rt-headers
+diff --git a/lib/dfsan/CMakeLists.txt b/lib/dfsan/CMakeLists.txt
+index 051215edbeb7..ecce1f52efb0 100644
+--- a/lib/dfsan/CMakeLists.txt
++++ b/lib/dfsan/CMakeLists.txt
+@@ -56,4 +56,4 @@ add_custom_command(OUTPUT ${dfsan_abilist_filename}
+                    DEPENDS done_abilist.txt libc_ubuntu1404_abilist.txt)
+ add_dependencies(dfsan dfsan_abilist)
+ install(FILES ${dfsan_abilist_filename}
+-        DESTINATION ${COMPILER_RT_INSTALL_PATH}/share)
++        DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_DATADIR})
diff --git a/pkgs/development/compilers/llvm/10/default.nix b/pkgs/development/compilers/llvm/10/default.nix
index 3fa91cd8374..e2e78e16d79 100644
--- a/pkgs/development/compilers/llvm/10/default.nix
+++ b/pkgs/development/compilers/llvm/10/default.nix
@@ -1,6 +1,5 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, gccForLibs
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
-, buildPackages
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 }:
@@ -18,31 +17,39 @@ let
   clang-tools-extra_src = fetch "clang-tools-extra" "06n1yp638rh24xdxv9v2df0qajxbjz4w59b7dd4ky36drwmpi4yh";
 
   tools = lib.makeExtensible (tools: let
-    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch; });
-    mkExtraBuildCommands = cc: ''
+    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch buildLlvmTools; });
+    mkExtraBuildCommands0 = cc: ''
       rsrc="$out/resource-root"
       mkdir "$rsrc"
-      ln -s "${cc}/lib/clang/${release_version}/include" "$rsrc"
+      ln -s "${cc.lib}/lib/clang/${release_version}/include" "$rsrc"
+      echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
+    '';
+    mkExtraBuildCommands = cc: mkExtraBuildCommands0 cc + ''
       ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
       ln -s "${targetLlvmLibraries.compiler-rt.out}/share" "$rsrc/share"
-      echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
     '';
+
   in {
 
-    llvm = callPackage ./llvm { };
+    libllvm = callPackage ./llvm { };
 
-    clang-unwrapped = callPackage ./clang {
-      inherit (tools) lld;
+    # `llvm` historically had the binaries.  When choosing an output explicitly,
+    # we need to reintroduce `outputUnspecified` to get the expected behavior e.g. of lib.get*
+    llvm = tools.libllvm.out // { outputUnspecified = true; };
+
+    libclang = callPackage ./clang {
       inherit clang-tools-extra_src;
     };
 
+    clang-unwrapped = tools.libclang.out // { outputUnspecified = true; };
+
     # disabled until recommonmark supports sphinx 3
-    #Llvm-manpages = lowPrio (tools.llvm.override {
+    #Llvm-manpages = lowPrio (tools.libllvm.override {
     #  enableManpages = true;
     #  python3 = pkgs.python3;  # don't use python-boot
     #});
 
-    clang-manpages = lowPrio (tools.clang-unwrapped.override {
+    clang-manpages = lowPrio (tools.libclang.override {
       enableManpages = true;
       python3 = pkgs.python3;  # don't use python-boot
     });
@@ -53,8 +60,6 @@ let
     #   python3 = pkgs.python3;  # don't use python-boot
     # });
 
-    libclang = tools.clang-unwrapped.lib;
-
     clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
 
     libstdcxxClang = wrapCCWith rec {
@@ -144,7 +149,7 @@ let
       '' + mkExtraBuildCommands cc;
     };
 
-    lldClangNoCompilerRt = wrapCCWith {
+    lldClangNoCompilerRt = wrapCCWith rec {
       cc = tools.clang-unwrapped;
       libcxx = null;
       bintools = wrapBintoolsWith {
@@ -154,7 +159,7 @@ let
       extraPackages = [ ];
       extraBuildCommands = ''
         echo "-nostartfiles" >> $out/nix-support/cc-cflags
-      '';
+      '' + mkExtraBuildCommands0 cc;
     };
 
   });
diff --git a/pkgs/development/compilers/llvm/10/libc++/default.nix b/pkgs/development/compilers/llvm/10/libc++/default.nix
index a3fb0927345..1e5dc5b2dac 100644
--- a/pkgs/development/compilers/llvm/10/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/10/libc++/default.nix
@@ -13,7 +13,11 @@ stdenv.mkDerivation {
     export LIBCXXABI_INCLUDE_DIR="$PWD/$(ls -d libcxxabi-${version}*)/include"
   '';
 
-  patches = lib.optional stdenv.hostPlatform.isMusl ../../libcxx-0001-musl-hacks.patch;
+  outputs = [ "out" "dev" ];
+
+  patches = [
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional stdenv.hostPlatform.isMusl ../../libcxx-0001-musl-hacks.patch;
 
   preConfigure = ''
     # Get headers from the cxxabi source so we can see private headers not installed by the cxxabi package
diff --git a/pkgs/development/compilers/llvm/10/libc++/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/10/libc++/gnu-install-dirs.patch
new file mode 100644
index 00000000000..4b031e90bdd
--- /dev/null
+++ b/pkgs/development/compilers/llvm/10/libc++/gnu-install-dirs.patch
@@ -0,0 +1,99 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 60564dc96c7b..77d832ad5a44 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -26,6 +26,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXX_STANDALONE_BUILD)
+   project(libcxx CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxx)
+   set(PACKAGE_VERSION 10.0.1)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+@@ -415,7 +417,7 @@ string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
+ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   set(LIBCXX_HEADER_DIR ${LLVM_BINARY_DIR})
+-  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
++  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBCXX_LIBRARY_DIR /${LIBCXX_LIBDIR_SUBDIR})
+     string(APPEND LIBCXX_INSTALL_LIBRARY_DIR /${LIBCXX_LIBDIR_SUBDIR})
+@@ -423,10 +425,10 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+   set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+   set(LIBCXX_HEADER_DIR  ${LLVM_BINARY_DIR})
+-  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX})
++  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX})
+ else()
+   set(LIBCXX_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX})
+-  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX})
++  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX})
+ endif()
+ 
+ file(MAKE_DIRECTORY "${LIBCXX_BINARY_INCLUDE_DIR}")
+diff --git a/cmake/Modules/HandleLibCXXABI.cmake b/cmake/Modules/HandleLibCXXABI.cmake
+index 10f100f7f0fb..95ed3978ab73 100644
+--- a/cmake/Modules/HandleLibCXXABI.cmake
++++ b/cmake/Modules/HandleLibCXXABI.cmake
+@@ -61,7 +61,7 @@ macro(setup_abi_lib abidefines abishared abistatic abifiles abidirs)
+ 
+         if (LIBCXX_INSTALL_HEADERS)
+           install(FILES "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}"
+-            DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1/${dstdir}
++            DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dstdir}
+             COMPONENT cxx-headers
+             PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+             )
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index 302da8a131b4..4c6ab463f564 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -244,7 +244,7 @@ if (LIBCXX_INSTALL_HEADERS)
+   foreach(file ${files})
+     get_filename_component(dir ${file} DIRECTORY)
+     install(FILES ${file}
+-      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1/${dir}
++      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dir}
+       COMPONENT ${CXX_HEADER_TARGET}
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+     )
+@@ -253,7 +253,7 @@ if (LIBCXX_INSTALL_HEADERS)
+   if (LIBCXX_NEEDS_SITE_CONFIG)
+     # Install the generated header as __config.
+     install(FILES ${LIBCXX_BINARY_DIR}/__generated_config
+-      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1
++      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+       RENAME __config
+       COMPONENT ${CXX_HEADER_TARGET})
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index 120505fe18da..9b8456d8405a 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -341,21 +341,21 @@ if (LIBCXX_INSTALL_LIBRARY)
+     install(TARGETS cxx_shared
+       ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+       LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+-      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}bin COMPONENT cxx)
++      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
+   endif()
+ 
+   if (LIBCXX_INSTALL_STATIC_LIBRARY)
+     install(TARGETS cxx_static
+       ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+       LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+-      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}bin COMPONENT cxx)
++      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
+   endif()
+ 
+   if(LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY)
+     install(TARGETS ${LIBCXX_INSTALL_TARGETS} ${experimental_lib}
+       LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+       ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+-      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}bin COMPONENT cxx)
++      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
+   endif()
+ 
+   # NOTE: This install command must go after the cxx install command otherwise
diff --git a/pkgs/development/compilers/llvm/10/libc++abi/default.nix b/pkgs/development/compilers/llvm/10/libc++abi/default.nix
index 1909996614d..bc5e77b739d 100644
--- a/pkgs/development/compilers/llvm/10/libc++abi/default.nix
+++ b/pkgs/development/compilers/llvm/10/libc++abi/default.nix
@@ -8,20 +8,7 @@ stdenv.mkDerivation {
 
   src = fetch "libcxxabi" "0yqs722y76cwvmfsq0lb917r9m3fci7bf5z3yzl71yz9n88ghzm9";
 
-  nativeBuildInputs = [ cmake ];
-  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD && !stdenv.hostPlatform.isWasm) libunwind;
-
-  cmakeFlags = lib.optionals (stdenv.hostPlatform.useLLVM or false) [
-    "-DLLVM_ENABLE_LIBCXX=ON"
-    "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
-  ] ++ lib.optionals stdenv.hostPlatform.isWasm [
-    "-DLIBCXXABI_ENABLE_THREADS=OFF"
-    "-DLIBCXXABI_ENABLE_EXCEPTIONS=OFF"
-  ] ++ lib.optionals (!enableShared) [
-    "-DLIBCXXABI_ENABLE_SHARED=OFF"
-  ];
-
-  patches = [ ./no-threads.patch ];
+  outputs = [ "out" "dev" ];
 
   postUnpack = ''
     unpackFile ${libcxx.src}
@@ -35,6 +22,24 @@ stdenv.mkDerivation {
     patch -p1 -d $(ls -d llvm-*) -i ${./wasm.patch}
   '';
 
+  patches = [
+    ./no-threads.patch
+    ./gnu-install-dirs.patch
+  ];
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD && !stdenv.hostPlatform.isWasm) libunwind;
+
+  cmakeFlags = lib.optionals (stdenv.hostPlatform.useLLVM or false) [
+    "-DLLVM_ENABLE_LIBCXX=ON"
+    "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
+  ] ++ lib.optionals stdenv.hostPlatform.isWasm [
+    "-DLIBCXXABI_ENABLE_THREADS=OFF"
+    "-DLIBCXXABI_ENABLE_EXCEPTIONS=OFF"
+  ] ++ lib.optionals (!enableShared) [
+    "-DLIBCXXABI_ENABLE_SHARED=OFF"
+  ];
+
   installPhase = if stdenv.isDarwin
     then ''
       for file in lib/*.dylib; do
diff --git a/pkgs/development/compilers/llvm/10/libc++abi/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/10/libc++abi/gnu-install-dirs.patch
new file mode 100644
index 00000000000..0f80ade7c38
--- /dev/null
+++ b/pkgs/development/compilers/llvm/10/libc++abi/gnu-install-dirs.patch
@@ -0,0 +1,34 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 8f9572586b4a..bf0e41dfc751 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -20,6 +20,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXXABI_STANDALONE_BUILD)
+   project(libcxxabi CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxxabi)
+   set(PACKAGE_VERSION 10.0.1)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+@@ -214,17 +216,17 @@ string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
+ 
+ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+-  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
++  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBCXXABI_LIBRARY_DIR /${LIBCXXABI_LIBDIR_SUBDIR})
+     string(APPEND LIBCXXABI_INSTALL_LIBRARY_DIR /${LIBCXXABI_LIBDIR_SUBDIR})
+   endif()
+ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+   set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+-  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LIBCXXABI_LIBDIR_SUFFIX})
++  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX})
+ else()
+   set(LIBCXXABI_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXXABI_LIBDIR_SUFFIX})
+-  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LIBCXXABI_LIBDIR_SUFFIX})
++  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX})
+ endif()
+ 
+ set(LIBCXXABI_INSTALL_PREFIX "" CACHE STRING "Define libc++abi destination prefix.")
diff --git a/pkgs/development/compilers/llvm/10/libunwind/default.nix b/pkgs/development/compilers/llvm/10/libunwind/default.nix
index f0f45780a22..d010deb6618 100644
--- a/pkgs/development/compilers/llvm/10/libunwind/default.nix
+++ b/pkgs/development/compilers/llvm/10/libunwind/default.nix
@@ -8,6 +8,12 @@ stdenv.mkDerivation rec {
 
   src = fetch pname "09syx66idnm2pr46x2vmk0jn3iwdv0lkd04xy4zjbwmz3vn066bl";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
+  outputs = [ "out" "dev" ];
+
   nativeBuildInputs = [ cmake ];
 
   cmakeFlags = lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF";
diff --git a/pkgs/development/compilers/llvm/10/libunwind/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/10/libunwind/gnu-install-dirs.patch
new file mode 100644
index 00000000000..8cea7d3e334
--- /dev/null
+++ b/pkgs/development/compilers/llvm/10/libunwind/gnu-install-dirs.patch
@@ -0,0 +1,34 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index c033069ef1d0..e2846896eece 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -18,6 +18,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBUNWIND_STANDALONE_BUILD)
+   project(libunwind)
+ 
++  include(GNUInstallDirs)
++
+   # Rely on llvm-config.
+   set(CONFIG_OUTPUT)
+   if(NOT LLVM_CONFIG_PATH)
+@@ -189,17 +191,17 @@ string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
+ 
+ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBUNWIND_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+     string(APPEND LIBUNWIND_INSTALL_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+   endif()
+ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX})
+ else()
+   set(LIBUNWIND_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBUNWIND_LIBDIR_SUFFIX})
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX})
+ endif()
+ 
+ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBUNWIND_LIBRARY_DIR})
diff --git a/pkgs/development/compilers/llvm/10/lld/default.nix b/pkgs/development/compilers/llvm/10/lld/default.nix
index a94c1b5b0dd..03a48f02a0c 100644
--- a/pkgs/development/compilers/llvm/10/lld/default.nix
+++ b/pkgs/development/compilers/llvm/10/lld/default.nix
@@ -1,8 +1,9 @@
 { lib, stdenv
+, buildLlvmTools
 , fetch
 , cmake
 , libxml2
-, llvm
+, libllvm
 , version
 }:
 
@@ -12,15 +13,20 @@ stdenv.mkDerivation rec {
 
   src = fetch pname "0ynzi35r4fckvp6842alpd43qr810j3728yfslc66fk2mbh4j52r";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ llvm libxml2 ];
+  buildInputs = [ libllvm libxml2 ];
 
-  outputs = [ "out" "dev" ];
+  cmakeFlags = [
+    "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
+  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+  ];
 
-  postInstall = ''
-    moveToOutput include "$dev"
-    moveToOutput lib "$dev"
-  '';
+  outputs = [ "out" "lib" "dev" ];
 
   meta = {
     description = "The LLVM Linker";
diff --git a/pkgs/development/compilers/llvm/10/lld/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/10/lld/gnu-install-dirs.patch
new file mode 100644
index 00000000000..232f5cbac9d
--- /dev/null
+++ b/pkgs/development/compilers/llvm/10/lld/gnu-install-dirs.patch
@@ -0,0 +1,68 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 641f71c114ae..9d44c1463aff 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -6,6 +6,8 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   set(CMAKE_INCLUDE_CURRENT_DIR ON)
+   set(LLD_BUILT_STANDALONE TRUE)
+ 
++  include(GNUInstallDirs)
++
+   find_program(LLVM_CONFIG_PATH "llvm-config" DOC "Path to llvm-config binary")
+   if(NOT LLVM_CONFIG_PATH)
+     message(FATAL_ERROR "llvm-config not found: specify LLVM_CONFIG_PATH")
+@@ -202,7 +204,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/cmake/modules/AddLLD.cmake b/cmake/modules/AddLLD.cmake
+index fa48b428d26b..e7967aad3ceb 100644
+--- a/cmake/modules/AddLLD.cmake
++++ b/cmake/modules/AddLLD.cmake
+@@ -20,9 +20,9 @@ macro(add_lld_library name)
+     install(TARGETS ${name}
+       COMPONENT ${name}
+       ${export_to_lldtargets}
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      RUNTIME DESTINATION bin)
++      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+     if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+       add_llvm_install_targets(install-${name}
+@@ -54,7 +54,7 @@ macro(add_lld_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_lldtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -69,5 +69,5 @@ endmacro()
+ macro(add_lld_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/tools/lld/CMakeLists.txt b/tools/lld/CMakeLists.txt
+index a15e296e31df..654c2cfdb9c0 100644
+--- a/tools/lld/CMakeLists.txt
++++ b/tools/lld/CMakeLists.txt
+@@ -17,7 +17,7 @@ target_link_libraries(lld
+   )
+ 
+ install(TARGETS lld
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ if(NOT LLD_SYMLINKS_TO_CREATE)
+   set(LLD_SYMLINKS_TO_CREATE lld-link ld.lld ld64.lld wasm-ld)
diff --git a/pkgs/development/compilers/llvm/10/lldb/default.nix b/pkgs/development/compilers/llvm/10/lldb/default.nix
index 7fb8ed57a01..ccca340b3e2 100644
--- a/pkgs/development/compilers/llvm/10/lldb/default.nix
+++ b/pkgs/development/compilers/llvm/10/lldb/default.nix
@@ -7,8 +7,8 @@
 , which
 , libedit
 , libxml2
-, llvm
-, clang-unwrapped
+, libllvm
+, libclang
 , python3
 , version
 , darwin
@@ -22,19 +22,22 @@ stdenv.mkDerivation (rec {
 
   src = fetch pname "051p5b04y6z3g730rmc2n2v71lipbw7k69riww3a6sl74myfiaq7";
 
-  patches = [ ./procfs.patch ];
+  patches = [
+    ./procfs.patch
+    ./gnu-install-dirs.patch
+  ];
+
+  outputs = [ "out" "lib" "dev" ];
 
-  nativeBuildInputs = [ cmake python3 which swig lit ]
-    ++ lib.optionals enableManpages [ python3.pkgs.sphinx python3.pkgs.recommonmark ];
+  nativeBuildInputs = [
+    cmake python3 which swig lit
+  ] ++ lib.optionals enableManpages [
+    python3.pkgs.sphinx python3.pkgs.recommonmark
+  ];
 
   buildInputs = [
-    ncurses
-    zlib
-    libedit
-    libxml2
-    llvm
-  ]
-  ++ lib.optionals stdenv.isDarwin [
+    ncurses zlib libedit libxml2 libllvm
+  ] ++ lib.optionals stdenv.isDarwin [
     darwin.libobjc
     darwin.apple_sdk.libs.xpc
     darwin.apple_sdk.frameworks.Foundation
@@ -46,8 +49,9 @@ stdenv.mkDerivation (rec {
   hardeningDisable = [ "format" ];
 
   cmakeFlags = [
+    "-DLLDB_INCLUDE_TESTS=${if doCheck then "YES" else "NO"}"
     "-DLLVM_ENABLE_RTTI=OFF"
-    "-DClang_DIR=${clang-unwrapped}/lib/cmake"
+    "-DClang_DIR=${libclang.dev}/lib/cmake"
     "-DLLVM_EXTERNAL_LIT=${lit}/bin/lit"
   ] ++ lib.optionals stdenv.isDarwin [
     "-DLLDB_USE_SYSTEM_DEBUGSERVER=ON"
@@ -57,33 +61,38 @@ stdenv.mkDerivation (rec {
     "-DLLVM_ENABLE_SPHINX=ON"
     "-DSPHINX_OUTPUT_MAN=ON"
     "-DSPHINX_OUTPUT_HTML=OFF"
+  ] ++ lib.optionals doCheck [
+    "-DLLDB_TEST_C_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
+    "-DLLDB_TEST_CXX_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++"
   ];
 
+  doCheck = false;
+
   postInstall = ''
     # Editor support
     # vscode:
     install -D ../tools/lldb-vscode/package.json $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/package.json
     mkdir -p $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
-    ln -s $out/bin/lldb-vscode $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
+    ln -s $out/bin/llvm-vscode $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
   '';
 
   meta = with lib; {
     description = "A next-generation high-performance debugger";
-    homepage = "https://lldb.llvm.org";
-    license = licenses.ncsa;
-    platforms = platforms.all;
+    homepage    = "https://lldb.llvm.org";
+    license     = licenses.ncsa;
+    platforms   = platforms.all;
   };
 } // lib.optionalAttrs enableManpages {
   pname = "lldb-manpages";
 
   buildPhase = ''
-    make docs-lldb-man
+    make docs-man
   '';
 
   propagatedBuildInputs = [];
 
+  # manually install lldb man page
   installPhase = ''
-    # manually install lldb man page
     mkdir -p $out/share/man/man1
     install docs/man/lldb.1 -t $out/share/man/man1/
   '';
diff --git a/pkgs/development/compilers/llvm/10/lldb/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/10/lldb/gnu-install-dirs.patch
new file mode 100644
index 00000000000..053a580e45e
--- /dev/null
+++ b/pkgs/development/compilers/llvm/10/lldb/gnu-install-dirs.patch
@@ -0,0 +1,65 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 573b8556989e..a12cc6f6ba77 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -17,6 +17,8 @@ set(CMAKE_MODULE_PATH
+ # If we are not building as part of LLVM, build LLDB as a standalone project,
+ # using LLVM as an external library.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
++  include(GNUInstallDirs)
++
+   project(lldb)
+   include(LLDBStandalone)
+ 
+diff --git a/cmake/modules/AddLLDB.cmake b/cmake/modules/AddLLDB.cmake
+index ecf0b66a41a3..6f2d97af7a11 100644
+--- a/cmake/modules/AddLLDB.cmake
++++ b/cmake/modules/AddLLDB.cmake
+@@ -107,13 +107,13 @@ function(add_lldb_library name)
+   endif()
+ 
+   if(PARAM_SHARED)
+-    set(install_dest lib${LLVM_LIBDIR_SUFFIX})
++    set(install_dest ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+     if(PARAM_INSTALL_PREFIX)
+       set(install_dest ${PARAM_INSTALL_PREFIX})
+     endif()
+     # RUNTIME is relevant for DLL platforms, FRAMEWORK for macOS
+     install(TARGETS ${name} COMPONENT ${name}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       LIBRARY DESTINATION ${install_dest}
+       ARCHIVE DESTINATION ${install_dest}
+       FRAMEWORK DESTINATION ${install_dest})
+diff --git a/cmake/modules/LLDBConfig.cmake b/cmake/modules/LLDBConfig.cmake
+index 4a15a343ee1d..c74bbb6878d7 100644
+--- a/cmake/modules/LLDBConfig.cmake
++++ b/cmake/modules/LLDBConfig.cmake
+@@ -238,7 +238,7 @@ include_directories(BEFORE
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+@@ -247,7 +247,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/tools/intel-features/CMakeLists.txt b/tools/intel-features/CMakeLists.txt
+index aff75d7db334..98a527c5e761 100644
+--- a/tools/intel-features/CMakeLists.txt
++++ b/tools/intel-features/CMakeLists.txt
+@@ -64,4 +64,4 @@ if (LLDB_ENABLE_PYTHON AND LLDB_BUILD_INTEL_PT)
+ endif()
+ 
+ install(TARGETS lldbIntelFeatures
+-  LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
diff --git a/pkgs/development/compilers/llvm/10/llvm/default.nix b/pkgs/development/compilers/llvm/10/llvm/default.nix
index 3100eaf4db4..22ed308486d 100644
--- a/pkgs/development/compilers/llvm/10/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/10/llvm/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv
+, pkgsBuildBuild
 , fetch
 , cmake
 , python3
@@ -10,10 +11,10 @@
 , version
 , release_version
 , zlib
-, buildPackages
+, buildLlvmTools
 , debugVersion ? false
 , enableManpages ? false
-, enableSharedLibraries ? true
+, enableSharedLibraries ? !stdenv.hostPlatform.isStatic
 , enablePFM ? !(stdenv.isDarwin
   || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
   || stdenv.isAarch32 # broken for the armv7l builder
@@ -44,8 +45,7 @@ in stdenv.mkDerivation (rec {
     mv polly-* $sourceRoot/tools/polly
   '';
 
-  outputs = [ "out" "python" ]
-    ++ optional enableSharedLibraries "lib";
+  outputs = [ "out" "lib" "dev" "python" ];
 
   nativeBuildInputs = [ cmake python3 ]
     ++ optionals enableManpages [ python3.pkgs.sphinx python3.pkgs.recommonmark ];
@@ -55,10 +55,14 @@ in stdenv.mkDerivation (rec {
 
   propagatedBuildInputs = [ ncurses zlib ];
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
+
   postPatch = optionalString stdenv.isDarwin ''
     substituteInPlace cmake/modules/AddLLVM.cmake \
       --replace 'set(_install_name_dir INSTALL_NAME_DIR "@rpath")' "set(_install_name_dir)" \
-      --replace 'set(_install_rpath "@loader_path/../lib''${LLVM_LIBDIR_SUFFIX}" ''${extra_libdir})' ""
+      --replace 'set(_install_rpath "@loader_path/../''${CMAKE_INSTALL_LIBDIR}''${LLVM_LIBDIR_SUFFIX}" ''${extra_libdir})' ""
   ''
   # Patch llvm-config to return correct library path based on --link-{shared,static}.
   + optionalString (enableSharedLibraries) ''
@@ -97,6 +101,7 @@ in stdenv.mkDerivation (rec {
   '';
 
   cmakeFlags = with stdenv; [
+    "-DLLVM_INSTALL_CMAKE_DIR=${placeholder "dev"}/lib/cmake/llvm/"
     "-DCMAKE_BUILD_TYPE=${if debugVersion then "Debug" else "Release"}"
     "-DLLVM_INSTALL_UTILS=ON"  # Needed by rustc
     "-DLLVM_BUILD_TESTS=ON"
@@ -120,7 +125,20 @@ in stdenv.mkDerivation (rec {
     "-DCAN_TARGET_i386=false"
   ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
     "-DCMAKE_CROSSCOMPILING=True"
-    "-DLLVM_TABLEGEN=${buildPackages.llvm_10}/bin/llvm-tblgen"
+    "-DLLVM_TABLEGEN=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+    (
+      let
+        nativeCC = pkgsBuildBuild.targetPackages.stdenv.cc;
+        nativeBintools = nativeCC.bintools.bintools;
+        nativeToolchainFlags = [
+          "-DCMAKE_C_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}cc"
+          "-DCMAKE_CXX_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}c++"
+          "-DCMAKE_AR=${nativeBintools}/bin/${nativeBintools.targetPrefix}ar"
+          "-DCMAKE_STRIP=${nativeBintools}/bin/${nativeBintools.targetPrefix}strip"
+          "-DCMAKE_RANLIB=${nativeBintools}/bin/${nativeBintools.targetPrefix}ranlib"
+        ];
+      in "-DCROSS_TOOLCHAIN_FLAGS_NATIVE:list=${lib.concatStringsSep ";" nativeToolchainFlags}"
+    )
   ];
 
   postBuild = ''
@@ -134,20 +152,19 @@ in stdenv.mkDerivation (rec {
   postInstall = ''
     mkdir -p $python/share
     mv $out/share/opt-viewer $python/share/opt-viewer
-  ''
-  + optionalString enableSharedLibraries ''
-    moveToOutput "lib/libLLVM-*" "$lib"
-    moveToOutput "lib/libLLVM${stdenv.hostPlatform.extensions.sharedLibrary}" "$lib"
-  ''
-  + optionalString (enableSharedLibraries && (!stdenv.isDarwin)) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM-" "$lib/lib/libLLVM-"
+    moveToOutput "bin/llvm-config*" "$dev"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
+      --replace "\''${_IMPORT_PREFIX}/lib/lib" "$lib/lib/lib" \
+      --replace "$out/bin/llvm-config" "$dev/bin/llvm-config"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMConfig.cmake" \
+      --replace 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}")' 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}'"$lib"'")'
   ''
   + optionalString (stdenv.isDarwin && enableSharedLibraries) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM.dylib" "$lib/lib/libLLVM.dylib"
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${shortVersion}.dylib
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${release_version}.dylib
+  ''
+  + optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    cp NATIVE/bin/llvm-config $dev/bin/llvm-config-native
   '';
 
   doCheck = stdenv.isLinux && (!stdenv.isx86_32);
diff --git a/pkgs/development/compilers/llvm/10/llvm/gnu-install-dirs-polly.patch b/pkgs/development/compilers/llvm/10/llvm/gnu-install-dirs-polly.patch
new file mode 100644
index 00000000000..3353058d8ab
--- /dev/null
+++ b/pkgs/development/compilers/llvm/10/llvm/gnu-install-dirs-polly.patch
@@ -0,0 +1,106 @@
+diff --git a/tools/polly/CMakeLists.txt b/tools/polly/CMakeLists.txt
+index 9939097f743e..8cc538da912a 100644
+--- a/tools/polly/CMakeLists.txt
++++ b/tools/polly/CMakeLists.txt
+@@ -2,7 +2,11 @@
+ if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   project(Polly)
+   cmake_minimum_required(VERSION 3.4.3)
++endif()
++
++include(GNUInstallDirs)
+ 
++if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   # Where is LLVM installed?
+   find_package(LLVM CONFIG REQUIRED)
+   set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+@@ -145,14 +149,14 @@ include_directories(
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+     )
+ 
+   install(DIRECTORY ${POLLY_BINARY_DIR}/include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN "CMakeFiles" EXCLUDE
+diff --git a/tools/polly/cmake/CMakeLists.txt b/tools/polly/cmake/CMakeLists.txt
+index 211f95512717..f9e04a4844b6 100644
+--- a/tools/polly/cmake/CMakeLists.txt
++++ b/tools/polly/cmake/CMakeLists.txt
+@@ -79,18 +79,18 @@ file(GENERATE
+ 
+ # Generate PollyConfig.cmake for the install tree.
+ unset(POLLY_EXPORTS)
+-set(POLLY_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
++set(POLLY_INSTALL_PREFIX "")
+ set(POLLY_CONFIG_LLVM_CMAKE_DIR "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}")
++set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
++set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+ if (POLLY_BUNDLED_ISL)
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
+-    "${POLLY_INSTALL_PREFIX}/include/polly"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}/polly"
+     )
+ else()
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+     ${ISL_INCLUDE_DIRS}
+     )
+ endif()
+@@ -100,12 +100,12 @@ endif()
+ foreach(tgt IN LISTS POLLY_CONFIG_EXPORTED_TARGETS)
+   get_target_property(tgt_type ${tgt} TYPE)
+   if (tgt_type STREQUAL "EXECUTABLE")
+-    set(tgt_prefix "bin/")
++    set(tgt_prefix "${CMAKE_INSTALL_BINDIR}/")
+   else()
+-    set(tgt_prefix "lib/")
++    set(tgt_prefix "${CMAKE_INSTALL_LIBDIR}/")
+   endif()
+ 
+-  set(tgt_path "${CMAKE_INSTALL_PREFIX}/${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
++  set(tgt_path "${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
+   file(RELATIVE_PATH tgt_path ${POLLY_CONFIG_CMAKE_DIR} ${tgt_path})
+ 
+   if (NOT tgt_type STREQUAL "INTERFACE_LIBRARY")
+diff --git a/tools/polly/cmake/polly_macros.cmake b/tools/polly/cmake/polly_macros.cmake
+index 86de6f10686e..91f30891ccbe 100644
+--- a/tools/polly/cmake/polly_macros.cmake
++++ b/tools/polly/cmake/polly_macros.cmake
+@@ -44,8 +44,8 @@ macro(add_polly_library name)
+   if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LLVMPolly")
+     install(TARGETS ${name}
+       EXPORT LLVMExports
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++	  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   endif()
+   set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+ endmacro(add_polly_library)
+diff --git a/tools/polly/lib/External/CMakeLists.txt b/tools/polly/lib/External/CMakeLists.txt
+index 8ffd984e542b..261cc19f3238 100644
+--- a/tools/polly/lib/External/CMakeLists.txt
++++ b/tools/polly/lib/External/CMakeLists.txt
+@@ -274,7 +274,7 @@ if (POLLY_BUNDLED_ISL)
+     install(DIRECTORY
+       ${ISL_SOURCE_DIR}/include/
+       ${ISL_BINARY_DIR}/include/
+-      DESTINATION include/polly
++      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/polly
+       FILES_MATCHING
+       PATTERN "*.h"
+       PATTERN "CMakeFiles" EXCLUDE
diff --git a/pkgs/development/compilers/llvm/10/llvm/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/10/llvm/gnu-install-dirs.patch
new file mode 100644
index 00000000000..155bab32f43
--- /dev/null
+++ b/pkgs/development/compilers/llvm/10/llvm/gnu-install-dirs.patch
@@ -0,0 +1,416 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 0e85afa82c76..3e700d9c5fae 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -253,15 +253,21 @@ if (CMAKE_BUILD_TYPE AND
+   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+ endif()
+ 
++include(GNUInstallDirs)
++
+ set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
+ 
+-set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
++set(LLVM_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE STRING
++    "Path for binary subdirectory (defaults to 'bin')")
+ mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+ 
+ set(LLVM_UTILS_INSTALL_DIR "${LLVM_TOOLS_INSTALL_DIR}" CACHE STRING
+     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
+ mark_as_advanced(LLVM_UTILS_INSTALL_DIR)
+ 
++set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
++	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
++
+ # They are used as destination of target generators.
+ set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
+ set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
+@@ -527,9 +533,9 @@ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
+ option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
+ option (LLVM_ENABLE_BINDINGS "Build bindings." ON)
+ 
+-set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
++set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html"
+     CACHE STRING "Doxygen-generated HTML documentation install directory")
+-set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
++set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html"
+     CACHE STRING "OCamldoc-generated HTML documentation install directory")
+ 
+ option (LLVM_BUILD_EXTERNAL_COMPILER_RT
+@@ -993,7 +999,7 @@ endif()
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/llvm include/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -1005,7 +1011,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm ${LLVM_INCLUDE_DIR}/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -1020,13 +1026,13 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   if (LLVM_INSTALL_MODULEMAPS)
+     install(DIRECTORY include/llvm include/llvm-c
+-            DESTINATION include
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+             COMPONENT llvm-headers
+             FILES_MATCHING
+             PATTERN "module.modulemap"
+             )
+     install(FILES include/llvm/module.install.modulemap
+-            DESTINATION include/llvm
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm
+             COMPONENT llvm-headers
+             RENAME "module.extern.modulemap"
+             )
+diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
+index f5a1b0d6f238..a7387224d68f 100644
+--- a/cmake/modules/AddLLVM.cmake
++++ b/cmake/modules/AddLLVM.cmake
+@@ -729,9 +729,9 @@ macro(add_llvm_library name)
+ 
+       install(TARGETS ${name}
+               ${export_to_llvmexports}
+-              LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+-              ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+-              RUNTIME DESTINATION bin COMPONENT ${name})
++              LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
++              ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
++              RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ${name})
+ 
+       if (NOT LLVM_ENABLE_IDE)
+         add_llvm_install_targets(install-${name}
+@@ -934,7 +934,7 @@ function(process_llvm_pass_plugins)
+           "set(LLVM_STATIC_EXTENSIONS ${LLVM_STATIC_EXTENSIONS})")
+       install(FILES
+           ${llvm_cmake_builddir}/LLVMConfigExtensions.cmake
+-          DESTINATION ${LLVM_INSTALL_PACKAGE_DIR}
++          DESTINATION ${LLVM_INSTALL_CMAKE_DIR}
+           COMPONENT cmake-exports)
+ 
+       set(ExtensionDef "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def")
+@@ -1147,7 +1147,7 @@ macro(add_llvm_example name)
+   endif()
+   add_llvm_executable(${name} ${ARGN})
+   if( LLVM_BUILD_EXAMPLES )
+-    install(TARGETS ${name} RUNTIME DESTINATION examples)
++    install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   endif()
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endmacro(add_llvm_example name)
+@@ -1713,7 +1713,7 @@ function(llvm_install_library_symlink name dest type)
+   set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
+   set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
+ 
+-  set(output_dir lib${LLVM_LIBDIR_SUFFIX})
++  set(output_dir ${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   if(WIN32 AND "${type}" STREQUAL "SHARED")
+     set(output_dir bin)
+   endif()
+@@ -1730,7 +1730,7 @@ function(llvm_install_library_symlink name dest type)
+   endif()
+ endfunction()
+ 
+-function(llvm_install_symlink name dest)
++function(llvm_install_symlink name dest output_dir)
+   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
+   foreach(path ${CMAKE_MODULE_PATH})
+     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
+@@ -1753,7 +1753,7 @@ function(llvm_install_symlink name dest)
+   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
+ 
+   install(SCRIPT ${INSTALL_SYMLINK}
+-          CODE "install_symlink(${full_name} ${full_dest} ${LLVM_TOOLS_INSTALL_DIR})"
++          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+           COMPONENT ${component})
+ 
+   if (NOT LLVM_ENABLE_IDE AND NOT ARG_ALWAYS_GENERATE)
+@@ -1836,7 +1836,8 @@ function(add_llvm_tool_symlink link_name target)
+     endif()
+ 
+     if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
+-      llvm_install_symlink(${link_name} ${target})
++      GNUInstallDirs_get_absolute_install_dir(output_dir LLVM_TOOLS_INSTALL_DIR)
++      llvm_install_symlink(${link_name} ${target} ${output_dir})
+     endif()
+   endif()
+ endfunction()
+@@ -1958,9 +1959,9 @@ function(llvm_setup_rpath name)
+ 
+   if (APPLE)
+     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
+-    set(_install_rpath "@loader_path/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "@loader_path/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+   elseif(UNIX)
+-    set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
+       set_property(TARGET ${name} APPEND_STRING PROPERTY
+                    LINK_FLAGS " -Wl,-z,origin ")
+diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
+index 554046b20edf..4d1ad980641e 100644
+--- a/cmake/modules/AddOCaml.cmake
++++ b/cmake/modules/AddOCaml.cmake
+@@ -144,9 +144,9 @@ function(add_ocaml_library name)
+   endforeach()
+ 
+   if( APPLE )
+-    set(ocaml_rpath "@executable_path/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "@executable_path/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   elseif( UNIX )
+-    set(ocaml_rpath "\\$ORIGIN/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "\\$ORIGIN/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   endif()
+   list(APPEND ocaml_flags "-ldopt" "-Wl,-rpath,${ocaml_rpath}")
+ 
+diff --git a/cmake/modules/AddSphinxTarget.cmake b/cmake/modules/AddSphinxTarget.cmake
+index 2bf654b60c44..450ee45d86e6 100644
+--- a/cmake/modules/AddSphinxTarget.cmake
++++ b/cmake/modules/AddSphinxTarget.cmake
+@@ -78,7 +78,7 @@ function (add_sphinx_target builder project)
+         endif()
+       elseif (builder STREQUAL html)
+         string(TOUPPER "${project}" project_upper)
+-        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
++        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/html"
+             CACHE STRING "HTML documentation install directory for ${project}")
+ 
+         # '/.' indicates: copy the contents of the directory directly into
+diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
+index af757d6199a8..b0fb7e7705d1 100644
+--- a/cmake/modules/CMakeLists.txt
++++ b/cmake/modules/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
++set(LLVM_INSTALL_PACKAGE_DIR ${LLVM_INSTALL_CMAKE_DIR} CACHE STRING "Path for CMake subdirectory (defaults to 'cmake/llvm')")
+ set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+ 
+ # First for users who use an installed LLVM, create the LLVMExports.cmake file.
+@@ -96,13 +96,13 @@ foreach(p ${_count})
+   set(LLVM_CONFIG_CODE "${LLVM_CONFIG_CODE}
+ get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
+ endforeach(p)
+-set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
++set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
+ set(LLVM_CONFIG_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
+ set(LLVM_CONFIG_MAIN_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
+-set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
++set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
+ set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
+ set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
+-set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/bin")
++set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}")
+ set(LLVM_CONFIG_EXPORTS_FILE "\${LLVM_CMAKE_DIR}/LLVMExports.cmake")
+ set(LLVM_CONFIG_EXPORTS "${LLVM_EXPORTS}")
+ configure_file(
+diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
+index 09fed8085c23..aa79f192abf0 100644
+--- a/cmake/modules/LLVMInstallSymlink.cmake
++++ b/cmake/modules/LLVMInstallSymlink.cmake
+@@ -10,7 +10,7 @@ function(install_symlink name target outdir)
+     set(LINK_OR_COPY copy)
+   endif()
+ 
+-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
++  set(bindir "${DESTDIR}${outdir}/")
+ 
+   message(STATUS "Creating ${name}")
+ 
+diff --git a/docs/CMake.rst b/docs/CMake.rst
+index a86ebb3a37bd..e720711e2b3c 100644
+--- a/docs/CMake.rst
++++ b/docs/CMake.rst
+@@ -196,7 +196,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
+ **LLVM_LIBDIR_SUFFIX**:STRING
+   Extra suffix to append to the directory where libraries are to be
+   installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
+-  to install libraries to ``/usr/lib64``.
++  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
+ 
+ **CMAKE_C_FLAGS**:STRING
+   Extra flags to use when compiling C source files.
+@@ -516,8 +516,8 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
+   The path to install Doxygen-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/doxygen-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
+ 
+ **LLVM_ENABLE_SPHINX**:BOOL
+   If specified, CMake will search for the ``sphinx-build`` executable and will make
+@@ -548,13 +548,33 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_SPHINX_HTML_DIR**:STRING
+   The path to install Sphinx-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/html`.
+ 
+ **LLVM_INSTALL_OCAMLDOC_HTML_DIR**:STRING
+   The path to install OCamldoc-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/ocaml-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html`.
++
++**CMAKE_INSTALL_BINDIR**:STRING
++  The path to install binary tools, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `bin`.
++
++**CMAKE_INSTALL_LIBDIR**:STRING
++  The path to install libraries, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `lib`.
++
++**CMAKE_INSTALL_INCLUDEDIR**:STRING
++  The path to install header files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `include`.
++
++**CMAKE_INSTALL_DOCDIR**:STRING
++  The path to install documentation, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/doc`.
++
++**CMAKE_INSTALL_MANDIR**:STRING
++  The path to install manpage files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/man`.
+ 
+ **LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
+   macOS Only: If enabled CMake will generate a target named
+@@ -740,9 +760,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
+ 
+ This file is available in two different locations.
+ 
+-* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
+-  ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
+-  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
++* ``<LLVM_INSTALL_PACKAGE_DIR>LLVMConfig.cmake`` where
++  ``<LLVM_INSTALL_PACKAGE_DIR>`` is the location where LLVM CMake modules are
++  installed as part of an installed version of LLVM. This is typically
++  ``cmake/llvm/`` within the lib directory. On Linux, this is typically
++  ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
+ 
+ * ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
+   ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
+diff --git a/examples/Bye/CMakeLists.txt b/examples/Bye/CMakeLists.txt
+index 3206f90d0916..1822965fc35f 100644
+--- a/examples/Bye/CMakeLists.txt
++++ b/examples/Bye/CMakeLists.txt
+@@ -9,5 +9,5 @@ add_llvm_pass_plugin(Bye
+   BUILDTREE_ONLY
+  )
+ 
+-install(TARGETS ${name} RUNTIME DESTINATION examples)
++install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+ set_target_properties(${name} PROPERTIES FOLDER "Examples")
+diff --git a/include/llvm/CMakeLists.txt b/include/llvm/CMakeLists.txt
+index 1d5ca3ba92b0..026f5453c1da 100644
+--- a/include/llvm/CMakeLists.txt
++++ b/include/llvm/CMakeLists.txt
+@@ -4,5 +4,5 @@ add_subdirectory(Support)
+ # If we're doing an out-of-tree build, copy a module map for generated
+ # header files into the build area.
+ if (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+-  configure_file(module.modulemap.build module.modulemap COPYONLY)
++  configure_file(module.modulemap.build ${LLVM_INCLUDE_DIR}/module.modulemap COPYONLY)
+ endif (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
+index 63cef75368b7..6295478b1f3d 100644
+--- a/tools/llvm-config/BuildVariables.inc.in
++++ b/tools/llvm-config/BuildVariables.inc.in
+@@ -23,6 +23,10 @@
+ #define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
+ #define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
+ #define LLVM_LIBDIR_SUFFIX "@LLVM_LIBDIR_SUFFIX@"
++#define LLVM_INSTALL_BINDIR "@CMAKE_INSTALL_BINDIR@"
++#define LLVM_INSTALL_LIBDIR "@CMAKE_INSTALL_LIBDIR@"
++#define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
++#define LLVM_INSTALL_CMAKEDIR "@LLVM_INSTALL_CMAKE_DIR@"
+ #define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
+ #define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
+ #define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
+diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
+index fb12e29a36a8..dbb6c2b90332 100644
+--- a/tools/llvm-config/llvm-config.cpp
++++ b/tools/llvm-config/llvm-config.cpp
+@@ -358,12 +358,26 @@ int main(int argc, char **argv) {
+         ("-I" + ActiveIncludeDir + " " + "-I" + ActiveObjRoot + "/include");
+   } else {
+     ActivePrefix = CurrentExecPrefix;
+-    ActiveIncludeDir = ActivePrefix + "/include";
+-    SmallString<256> path(StringRef(LLVM_TOOLS_INSTALL_DIR));
+-    sys::fs::make_absolute(ActivePrefix, path);
+-    ActiveBinDir = path.str();
+-    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
+-    ActiveCMakeDir = ActiveLibDir + "/cmake/llvm";
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_INCLUDEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveIncludeDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_BINDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveBinDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveLibDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_CMAKEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveCMakeDir = std::string(path.str());
++    }
+     ActiveIncludeOption = "-I" + ActiveIncludeDir;
+   }
+ 
+diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
+index b86e4abd01a7..02ce5773f17d 100644
+--- a/tools/lto/CMakeLists.txt
++++ b/tools/lto/CMakeLists.txt
+@@ -23,7 +23,7 @@ set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/lto.exports)
+ add_llvm_library(LTO SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES} DEPENDS intrinsics_gen)
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/lto.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT LTO)
+ 
+ if (APPLE)
+diff --git a/tools/opt-viewer/CMakeLists.txt b/tools/opt-viewer/CMakeLists.txt
+index ead73ec13a8f..250362021f17 100644
+--- a/tools/opt-viewer/CMakeLists.txt
++++ b/tools/opt-viewer/CMakeLists.txt
+@@ -8,7 +8,7 @@ set (files
+ 
+ foreach (file ${files})
+   install(PROGRAMS ${file}
+-    DESTINATION share/opt-viewer
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/opt-viewer
+     COMPONENT opt-viewer)
+ endforeach (file)
+ 
+diff --git a/tools/remarks-shlib/CMakeLists.txt b/tools/remarks-shlib/CMakeLists.txt
+index e948496c603a..1f4df8a98b10 100644
+--- a/tools/remarks-shlib/CMakeLists.txt
++++ b/tools/remarks-shlib/CMakeLists.txt
+@@ -11,7 +11,7 @@ set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/Remarks.exports)
+ add_llvm_library(Remarks SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES})
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/Remarks.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT Remarks)
+ 
+ if (APPLE)
diff --git a/pkgs/development/compilers/llvm/11/clang/default.nix b/pkgs/development/compilers/llvm/11/clang/default.nix
index 2e03112d827..3b7accffbca 100644
--- a/pkgs/development/compilers/llvm/11/clang/default.nix
+++ b/pkgs/development/compilers/llvm/11/clang/default.nix
@@ -1,4 +1,5 @@
-{ lib, stdenv, fetch, cmake, libxml2, llvm, version, clang-tools-extra_src, python3, lld
+{ lib, stdenv, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+, buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
 }:
@@ -19,26 +20,31 @@ let
       mv clang-tools-extra-* $sourceRoot/tools/extra
     '';
 
-    nativeBuildInputs = [ cmake python3 lld ]
+    nativeBuildInputs = [ cmake python3 ]
       ++ lib.optional enableManpages python3.pkgs.sphinx
       ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-    buildInputs = [ libxml2 llvm ];
+    buildInputs = [ libxml2 libllvm ];
 
     cmakeFlags = [
       "-DCMAKE_CXX_FLAGS=-std=c++14"
       "-DCLANGD_BUILD_XPC=OFF"
+      "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
     ] ++ lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"
       "-DSPHINX_OUTPUT_MAN=ON"
       "-DSPHINX_OUTPUT_HTML=OFF"
       "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
     ];
 
     patches = [
       ./purity.patch
       # https://reviews.llvm.org/D51899
+      ./gnu-install-dirs.patch
     ];
 
     postPatch = ''
@@ -55,12 +61,12 @@ let
         --replace "NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB" FALSE
     '';
 
-    outputs = [ "out" "lib" "python" ];
+    outputs = [ "out" "lib" "dev" "python" ];
 
     # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${llvm}/lib/LLVMgold.so ]; then
-        ln -sv ${llvm}/lib/LLVMgold.so $out/lib
+      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
+        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
       fi
 
       ln -sv $out/bin/clang $out/bin/cpp
@@ -79,11 +85,14 @@ let
       fi
       mv $out/share/clang/*.py $python/share/clang
       rm $out/bin/c-index-test
+
+      mkdir -p $dev/bin
+      cp bin/clang-tblgen $dev/bin
     '';
 
     passthru = {
       isClang = true;
-      inherit llvm;
+      inherit libllvm;
     };
 
     meta = {
diff --git a/pkgs/development/compilers/llvm/11/clang/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/11/clang/gnu-install-dirs.patch
new file mode 100644
index 00000000000..98ea97e0580
--- /dev/null
+++ b/pkgs/development/compilers/llvm/11/clang/gnu-install-dirs.patch
@@ -0,0 +1,235 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index bb4b801f01c8..77a8b43b22c8 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -9,6 +9,8 @@ endif()
+ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
+   project(Clang)
+ 
++  include(GNUInstallDirs)
++
+   set(CMAKE_CXX_STANDARD 14 CACHE STRING "C++ standard to conform to")
+   set(CMAKE_CXX_STANDARD_REQUIRED YES)
+   set(CMAKE_CXX_EXTENSIONS NO)
+@@ -447,7 +449,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/clang include/clang-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -457,7 +459,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "CMakeFiles" EXCLUDE
+@@ -477,7 +479,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   add_custom_target(bash-autocomplete DEPENDS utils/bash-autocomplete.sh)
+   install(PROGRAMS utils/bash-autocomplete.sh
+-          DESTINATION share/clang
++          DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+           COMPONENT bash-autocomplete)
+   if(NOT LLVM_ENABLE_IDE)
+     add_llvm_install_targets(install-bash-autocomplete
+diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
+index 704278a0e93b..d25c8d325c71 100644
+--- a/cmake/modules/AddClang.cmake
++++ b/cmake/modules/AddClang.cmake
+@@ -123,9 +123,9 @@ macro(add_clang_library name)
+         install(TARGETS ${lib}
+           COMPONENT ${lib}
+           ${export_to_clangtargets}
+-          LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-          ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-          RUNTIME DESTINATION bin)
++          LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++          ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++          RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+         if (NOT LLVM_ENABLE_IDE)
+           add_llvm_install_targets(install-${lib}
+@@ -170,7 +170,7 @@ macro(add_clang_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_clangtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT LLVM_ENABLE_IDE)
+@@ -185,7 +185,7 @@ endmacro()
+ macro(add_clang_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+ 
+ function(clang_target_link_libraries target type)
+diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
+index 0692fe75a441..6f201e7207d0 100644
+--- a/lib/Headers/CMakeLists.txt
++++ b/lib/Headers/CMakeLists.txt
+@@ -208,7 +208,7 @@ set_target_properties(clang-resource-headers PROPERTIES
+   FOLDER "Misc"
+   RUNTIME_OUTPUT_DIRECTORY "${output_dir}")
+ 
+-set(header_install_dir lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++set(header_install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ install(
+   FILES ${files} ${generated_files}
+diff --git a/tools/c-index-test/CMakeLists.txt b/tools/c-index-test/CMakeLists.txt
+index ceef4b08637c..8efad5520ca4 100644
+--- a/tools/c-index-test/CMakeLists.txt
++++ b/tools/c-index-test/CMakeLists.txt
+@@ -54,7 +54,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
+        "@executable_path/../../lib")
+   else()
+-    set(INSTALL_DESTINATION bin)
++    set(INSTALL_DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endif()
+ 
+   install(TARGETS c-index-test
+diff --git a/tools/clang-format/CMakeLists.txt b/tools/clang-format/CMakeLists.txt
+index 35ecdb11253c..d77d75de0094 100644
+--- a/tools/clang-format/CMakeLists.txt
++++ b/tools/clang-format/CMakeLists.txt
+@@ -21,20 +21,20 @@ if( LLVM_LIB_FUZZING_ENGINE OR LLVM_USE_SANITIZE_COVERAGE )
+ endif()
+ 
+ install(PROGRAMS clang-format-bbedit.applescript
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-diff.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-sublime.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS git-clang-format
+-  DESTINATION bin
++  DESTINATION ${CMAKE_INSTALL_BINDIR}
+   COMPONENT clang-format)
+diff --git a/tools/clang-rename/CMakeLists.txt b/tools/clang-rename/CMakeLists.txt
+index cda8e29ec5b1..0134d8ccd70b 100644
+--- a/tools/clang-rename/CMakeLists.txt
++++ b/tools/clang-rename/CMakeLists.txt
+@@ -19,8 +19,8 @@ clang_target_link_libraries(clang-rename
+   )
+ 
+ install(PROGRAMS clang-rename.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+ install(PROGRAMS clang-rename.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
+index 5cd9ac5cddc1..a197676fedbd 100644
+--- a/tools/libclang/CMakeLists.txt
++++ b/tools/libclang/CMakeLists.txt
+@@ -165,7 +165,7 @@ endif()
+ if(INTERNAL_INSTALL_PREFIX)
+   set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
+ else()
+-  set(LIBCLANG_HEADERS_INSTALL_DESTINATION include)
++  set(LIBCLANG_HEADERS_INSTALL_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+ endif()
+ 
+ install(DIRECTORY ../../include/clang-c
+@@ -196,7 +196,7 @@ foreach(PythonVersion ${CLANG_PYTHON_BINDINGS_VERSIONS})
+           COMPONENT
+             libclang-python-bindings
+           DESTINATION
+-            "lib${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
++            "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
+ endforeach()
+ if(NOT LLVM_ENABLE_IDE)
+   add_custom_target(libclang-python-bindings)
+diff --git a/tools/scan-build/CMakeLists.txt b/tools/scan-build/CMakeLists.txt
+index ec0702d76f18..d25d982f51da 100644
+--- a/tools/scan-build/CMakeLists.txt
++++ b/tools/scan-build/CMakeLists.txt
+@@ -47,7 +47,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+     install(PROGRAMS bin/${BinFile}
+-            DESTINATION bin
++            DESTINATION ${CMAKE_INSTALL_BINDIR}
+             COMPONENT scan-build)
+   endforeach()
+ 
+@@ -61,7 +61,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libexec/${LibexecFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/libexec/${LibexecFile})
+     install(PROGRAMS libexec/${LibexecFile}
+-            DESTINATION libexec
++            DESTINATION ${CMAKE_INSTALL_LIBEXECDIR}
+             COMPONENT scan-build)
+   endforeach()
+ 
+@@ -89,7 +89,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/scan-build/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-build/${ShareFile})
+     install(FILES share/scan-build/${ShareFile}
+-            DESTINATION share/scan-build
++            DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-build
+             COMPONENT scan-build)
+   endforeach()
+ 
+diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
+index 22edb974bac7..9f140a9a4538 100644
+--- a/tools/scan-view/CMakeLists.txt
++++ b/tools/scan-view/CMakeLists.txt
+@@ -22,7 +22,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+     install(PROGRAMS bin/${BinFile}
+-            DESTINATION bin
++            DESTINATION ${CMAKE_INSTALL_BINDIR}
+             COMPONENT scan-view)
+   endforeach()
+ 
+@@ -36,7 +36,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-view/${ShareFile})
+     install(FILES share/${ShareFile}
+-            DESTINATION share/scan-view
++            DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-view
+             COMPONENT scan-view)
+   endforeach()
+ 
+diff --git a/utils/hmaptool/CMakeLists.txt b/utils/hmaptool/CMakeLists.txt
+index 62f2de0cb15c..6aa66825b6ec 100644
+--- a/utils/hmaptool/CMakeLists.txt
++++ b/utils/hmaptool/CMakeLists.txt
+@@ -10,7 +10,7 @@ add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HM
+ 
+ list(APPEND Depends ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HMAPTOOL})
+ install(PROGRAMS ${CLANG_HMAPTOOL}
+-        DESTINATION bin
++        DESTINATION ${CMAKE_INSTALL_BINDIR}
+         COMPONENT hmaptool)
+ 
+ add_custom_target(hmaptool ALL DEPENDS ${Depends})
diff --git a/pkgs/development/compilers/llvm/11/compiler-rt/default.nix b/pkgs/development/compilers/llvm/11/compiler-rt/default.nix
index 6ab36063077..257bc34092f 100644
--- a/pkgs/development/compilers/llvm/11/compiler-rt/default.nix
+++ b/pkgs/development/compilers/llvm/11/compiler-rt/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   inherit version;
   src = fetch pname "0x1j8ngf1zj63wlnns9vlibafq48qcm72p4jpaxkmkb4qw0grwfy";
 
-  nativeBuildInputs = [ cmake python3 llvm ];
+  nativeBuildInputs = [ cmake python3 llvm.dev ];
   buildInputs = lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
   NIX_CFLAGS_COMPILE = [
@@ -24,10 +24,6 @@ stdenv.mkDerivation rec {
     "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON"
     "-DCMAKE_C_COMPILER_TARGET=${stdenv.hostPlatform.config}"
     "-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
-  ] ++ lib.optionals (stdenv.isDarwin) [
-    "-DDARWIN_macosx_OVERRIDE_SDK_VERSION=ON"
-    "-DDARWIN_osx_ARCHS=${stdenv.hostPlatform.darwinArch}"
-    "-DDARWIN_osx_BUILTIN_ARCHS=${stdenv.hostPlatform.darwinArch}"
   ] ++ lib.optionals (useLLVM || bareMetal || isMusl) [
     "-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
     "-DCOMPILER_RT_BUILD_XRAY=OFF"
@@ -45,6 +41,10 @@ stdenv.mkDerivation rec {
     "-DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY"
   ] ++ lib.optionals (bareMetal) [
     "-DCOMPILER_RT_OS_DIR=baremetal"
+  ] ++ lib.optionals (stdenv.hostPlatform.isDarwin) [
+    "-DDARWIN_macosx_OVERRIDE_SDK_VERSION=ON"
+    "-DDARWIN_osx_ARCHS=${stdenv.hostPlatform.darwinArch}"
+    "-DDARWIN_osx_BUILTIN_ARCHS=${stdenv.hostPlatform.darwinArch}"
   ];
 
   outputs = [ "out" "dev" ];
@@ -52,6 +52,10 @@ stdenv.mkDerivation rec {
   patches = [
     ./codesign.patch # Revert compiler-rt commit that makes codesign mandatory
     ./X86-support-extension.patch # Add support for i486 i586 i686 by reusing i386 config
+    ./gnu-install-dirs.patch
+    # ld-wrapper dislikes `-rpath-link //nix/store`, so we normalize away the
+    # extra `/`.
+    ./normalize-var.patch
   ]# ++ lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
     ++ lib.optional stdenv.hostPlatform.isAarch32 ./armv7l.patch;
 
diff --git a/pkgs/development/compilers/llvm/11/compiler-rt/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/11/compiler-rt/gnu-install-dirs.patch
new file mode 100644
index 00000000000..91e20882929
--- /dev/null
+++ b/pkgs/development/compilers/llvm/11/compiler-rt/gnu-install-dirs.patch
@@ -0,0 +1,129 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index fa62814b635d..6328614d829e 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -12,6 +12,7 @@ endif()
+ # Check if compiler-rt is built as a standalone project.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR COMPILER_RT_STANDALONE_BUILD)
+   project(CompilerRT C CXX ASM)
++  include(GNUInstallDirs)
+   set(COMPILER_RT_STANDALONE_BUILD TRUE)
+   set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+ endif()
+diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake
+index 7c127a93dfa7..6a95a65b70a7 100644
+--- a/cmake/Modules/AddCompilerRT.cmake
++++ b/cmake/Modules/AddCompilerRT.cmake
+@@ -524,7 +524,7 @@ macro(add_compiler_rt_resource_file target_name file_name component)
+   add_custom_target(${target_name} DEPENDS ${dst_file})
+   # Install in Clang resource directory.
+   install(FILES ${file_name}
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/share
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_DATADIR}
+     COMPONENT ${component})
+   add_dependencies(${component} ${target_name})
+ 
+@@ -541,7 +541,7 @@ macro(add_compiler_rt_script name)
+   add_custom_target(${name} DEPENDS ${dst})
+   install(FILES ${dst}
+     PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/bin)
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_BINDIR})
+ endmacro(add_compiler_rt_script src name)
+ 
+ # Builds custom version of libc++ and installs it in <prefix>.
+diff --git a/cmake/Modules/CompilerRTDarwinUtils.cmake b/cmake/Modules/CompilerRTDarwinUtils.cmake
+index be8d7e733c7a..ab256bdff26c 100644
+--- a/cmake/Modules/CompilerRTDarwinUtils.cmake
++++ b/cmake/Modules/CompilerRTDarwinUtils.cmake
+@@ -498,7 +498,7 @@ macro(darwin_add_embedded_builtin_libraries)
+     set(DARWIN_macho_embedded_LIBRARY_OUTPUT_DIR
+       ${COMPILER_RT_OUTPUT_DIR}/lib/macho_embedded)
+     set(DARWIN_macho_embedded_LIBRARY_INSTALL_DIR
+-      ${COMPILER_RT_INSTALL_PATH}/lib/macho_embedded)
++      ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/macho_embedded)
+       
+     set(CFLAGS_armv7 "-target thumbv7-apple-darwin-eabi")
+     set(CFLAGS_i386 "-march=pentium")
+diff --git a/cmake/Modules/CompilerRTUtils.cmake b/cmake/Modules/CompilerRTUtils.cmake
+index 99b9f0e4af44..c5183ffa746e 100644
+--- a/cmake/Modules/CompilerRTUtils.cmake
++++ b/cmake/Modules/CompilerRTUtils.cmake
+@@ -375,7 +375,7 @@ endfunction()
+ function(get_compiler_rt_install_dir arch install_dir)
+   if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+     get_compiler_rt_target(${arch} target)
+-    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/lib/${target} PARENT_SCOPE)
++    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${target} PARENT_SCOPE)
+   else()
+     set(${install_dir} ${COMPILER_RT_LIBRARY_INSTALL_DIR} PARENT_SCOPE)
+   endif()
+diff --git a/cmake/base-config-ix.cmake b/cmake/base-config-ix.cmake
+index 964dd598f102..2acaab87d349 100644
+--- a/cmake/base-config-ix.cmake
++++ b/cmake/base-config-ix.cmake
+@@ -66,11 +66,11 @@ if (LLVM_TREE_AVAILABLE)
+ else()
+     # Take output dir and install path from the user.
+   set(COMPILER_RT_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH
+-    "Path where built compiler-rt libraries should be stored.")
++    "Path where built compiler-rt build artifacts should be stored.")
+   set(COMPILER_RT_EXEC_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/bin CACHE PATH
+     "Path where built compiler-rt executables should be stored.")
+-  set(COMPILER_RT_INSTALL_PATH ${CMAKE_INSTALL_PREFIX} CACHE PATH
+-    "Path where built compiler-rt libraries should be installed.")
++  set(COMPILER_RT_INSTALL_PATH "" CACHE PATH
++    "Prefix where built compiler-rt artifacts should be installed, comes before CMAKE_INSTALL_PREFIX.")
+   option(COMPILER_RT_INCLUDE_TESTS "Generate and build compiler-rt unit tests." OFF)
+   option(COMPILER_RT_ENABLE_WERROR "Fail and stop if warning is triggered" OFF)
+   # Use a host compiler to compile/link tests.
+@@ -98,7 +98,7 @@ else(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
+   set(COMPILER_RT_LIBRARY_OUTPUT_DIR
+     ${COMPILER_RT_OUTPUT_DIR}/lib/${COMPILER_RT_OS_DIR})
+   set(COMPILER_RT_LIBRARY_INSTALL_DIR
+-    ${COMPILER_RT_INSTALL_PATH}/lib/${COMPILER_RT_OS_DIR})
++    ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${COMPILER_RT_OS_DIR})
+ endif()
+ 
+ if(APPLE)
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index d47d7baeb118..507c8e5c713e 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -62,22 +62,22 @@ set_target_properties(compiler-rt-headers PROPERTIES FOLDER "Compiler-RT Misc")
+ install(FILES ${SANITIZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/sanitizer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/sanitizer)
+ # Install fuzzer headers.
+ install(FILES ${FUZZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/fuzzer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/fuzzer)
+ # Install xray headers.
+ install(FILES ${XRAY_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/xray)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/xray)
+ # Install profile headers.
+ install(FILES ${PROFILE_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/profile)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/profile)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDEs.
+   add_custom_target(install-compiler-rt-headers
+diff --git a/lib/dfsan/CMakeLists.txt b/lib/dfsan/CMakeLists.txt
+index 051215edbeb7..ecce1f52efb0 100644
+--- a/lib/dfsan/CMakeLists.txt
++++ b/lib/dfsan/CMakeLists.txt
+@@ -56,4 +56,4 @@ add_custom_command(OUTPUT ${dfsan_abilist_filename}
+                    DEPENDS done_abilist.txt libc_ubuntu1404_abilist.txt)
+ add_dependencies(dfsan dfsan_abilist)
+ install(FILES ${dfsan_abilist_filename}
+-        DESTINATION ${COMPILER_RT_INSTALL_PATH}/share)
++        DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_DATADIR})
diff --git a/pkgs/development/compilers/llvm/11/compiler-rt/normalize-var.patch b/pkgs/development/compilers/llvm/11/compiler-rt/normalize-var.patch
new file mode 100644
index 00000000000..b9986910e51
--- /dev/null
+++ b/pkgs/development/compilers/llvm/11/compiler-rt/normalize-var.patch
@@ -0,0 +1,16 @@
+diff --git a/compiler-rt/cmake/Modules/CompilerRTUtils.cmake b/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
+index c5183ffa746e..e4e4a007335d 100644
+--- a/cmake/Modules/CompilerRTUtils.cmake
++++ b/cmake/Modules/CompilerRTUtils.cmake
+@@ -299,8 +299,9 @@ macro(load_llvm_config)
+     # Get some LLVM variables from LLVMConfig.
+     include("${LLVM_CMAKE_PATH}/LLVMConfig.cmake")
+ 
+-    set(LLVM_LIBRARY_OUTPUT_INTDIR
+-      ${LLVM_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
++    get_filename_component(LLVM_LIBRARY_OUTPUT_INTDIR
++      ${LLVM_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX}
++      REALPATH)
+   endif()
+ endmacro()
+ 
diff --git a/pkgs/development/compilers/llvm/11/default.nix b/pkgs/development/compilers/llvm/11/default.nix
index 22209ffb647..69c6564babe 100644
--- a/pkgs/development/compilers/llvm/11/default.nix
+++ b/pkgs/development/compilers/llvm/11/default.nix
@@ -1,6 +1,5 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, gccForLibs
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
-, buildPackages
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 }:
@@ -20,31 +19,38 @@ let
   clang-tools-extra_src = fetch "clang-tools-extra" "18n1w1hkv931xzq02b34wglbv6zd6sd0r5kb8piwvag7klj7qw3n";
 
   tools = lib.makeExtensible (tools: let
-    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch; });
-    mkExtraBuildCommands = cc: ''
+    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch buildLlvmTools; });
+    mkExtraBuildCommands0 = cc: ''
       rsrc="$out/resource-root"
       mkdir "$rsrc"
-      ln -s "${cc}/lib/clang/${release_version}/include" "$rsrc"
+      ln -s "${cc.lib}/lib/clang/${release_version}/include" "$rsrc"
+      echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
+    '';
+    mkExtraBuildCommands = cc: mkExtraBuildCommands0 cc + ''
       ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
       ln -s "${targetLlvmLibraries.compiler-rt.out}/share" "$rsrc/share"
-      echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
     '';
+
   in {
 
-    llvm = callPackage ./llvm { };
+    libllvm = callPackage ./llvm { };
+
+    # `llvm` historically had the binaries.  When choosing an output explicitly,
+    # we need to reintroduce `outputUnspecified` to get the expected behavior e.g. of lib.get*
+    llvm = tools.libllvm.out // { outputUnspecified = true; };
 
-    clang-unwrapped = callPackage ./clang {
-      inherit (tools) lld;
+    libclang = callPackage ./clang {
       inherit clang-tools-extra_src;
     };
 
+    clang-unwrapped = tools.libclang.out // { outputUnspecified = true; };
     # disabled until recommonmark supports sphinx 3
-    #Llvm-manpages = lowPrio (tools.llvm.override {
+    #Llvm-manpages = lowPrio (tools.libllvm.override {
     #  enableManpages = true;
     #  python3 = pkgs.python3;  # don't use python-boot
     #});
 
-    clang-manpages = lowPrio (tools.clang-unwrapped.override {
+    clang-manpages = lowPrio (tools.libclang.override {
       enableManpages = true;
       python3 = pkgs.python3;  # don't use python-boot
     });
@@ -55,8 +61,6 @@ let
     #   python3 = pkgs.python3;  # don't use python-boot
     # });
 
-    libclang = tools.clang-unwrapped.lib;
-
     clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
 
     libstdcxxClang = wrapCCWith rec {
@@ -146,7 +150,7 @@ let
       '' + mkExtraBuildCommands cc;
     };
 
-    lldClangNoCompilerRt = wrapCCWith {
+    lldClangNoCompilerRt = wrapCCWith rec {
       cc = tools.clang-unwrapped;
       libcxx = null;
       bintools = wrapBintoolsWith {
@@ -156,7 +160,7 @@ let
       extraPackages = [ ];
       extraBuildCommands = ''
         echo "-nostartfiles" >> $out/nix-support/cc-cflags
-      '';
+      '' + mkExtraBuildCommands0 cc;
     };
 
   });
diff --git a/pkgs/development/compilers/llvm/11/libc++/default.nix b/pkgs/development/compilers/llvm/11/libc++/default.nix
index 6adb824f539..e095350cea7 100644
--- a/pkgs/development/compilers/llvm/11/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/11/libc++/default.nix
@@ -15,6 +15,8 @@ stdenv.mkDerivation {
     mv llvm-* llvm
   '';
 
+  outputs = [ "out" "dev" ];
+
   patches = [
     (fetchpatch {
       # Backported from LLVM 12, avoids clashes with commonly used "block.h" header.
@@ -22,6 +24,7 @@ stdenv.mkDerivation {
       sha256 = "sha256-aWa66ogmPkG0xHzSfcpD0qZyZQcNKwLV44js4eiun78=";
       stripLen = 1;
     })
+    ./gnu-install-dirs.patch
   ] ++ lib.optional stdenv.hostPlatform.isMusl ../../libcxx-0001-musl-hacks.patch;
 
   preConfigure = lib.optionalString stdenv.hostPlatform.isMusl ''
diff --git a/pkgs/development/compilers/llvm/11/libc++/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/11/libc++/gnu-install-dirs.patch
new file mode 100644
index 00000000000..2b95d6a85d8
--- /dev/null
+++ b/pkgs/development/compilers/llvm/11/libc++/gnu-install-dirs.patch
@@ -0,0 +1,100 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 910d04b54b6d..80ef692d83eb 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -31,6 +31,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXX_STANDALONE_BUILD)
+   project(libcxx CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxx)
+   set(PACKAGE_VERSION 11.1.0)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+@@ -418,7 +420,7 @@ string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
+ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   set(LIBCXX_HEADER_DIR ${LLVM_BINARY_DIR})
+-  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
++  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBCXX_LIBRARY_DIR /${LIBCXX_LIBDIR_SUBDIR})
+     string(APPEND LIBCXX_INSTALL_LIBRARY_DIR /${LIBCXX_LIBDIR_SUBDIR})
+@@ -426,11 +428,11 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+   set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+   set(LIBCXX_HEADER_DIR  ${LLVM_BINARY_DIR})
+-  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX})
++  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX})
+ else()
+   set(LIBCXX_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX})
+   set(LIBCXX_HEADER_DIR  ${CMAKE_BINARY_DIR})
+-  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX})
++  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX})
+ endif()
+ 
+ file(MAKE_DIRECTORY "${LIBCXX_BINARY_INCLUDE_DIR}")
+diff --git a/cmake/Modules/HandleLibCXXABI.cmake b/cmake/Modules/HandleLibCXXABI.cmake
+index c5aa26739e36..8841c4a5252d 100644
+--- a/cmake/Modules/HandleLibCXXABI.cmake
++++ b/cmake/Modules/HandleLibCXXABI.cmake
+@@ -63,7 +63,7 @@ macro(setup_abi_lib abidefines abishared abistatic abifiles abidirs)
+ 
+         if (LIBCXX_INSTALL_HEADERS)
+           install(FILES "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}"
+-            DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1/${dstdir}
++            DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dstdir}
+             COMPONENT cxx-headers
+             PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+             )
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index be8141c98166..93847e5758cc 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -257,7 +257,7 @@ if (LIBCXX_INSTALL_HEADERS)
+   foreach(file ${files})
+     get_filename_component(dir ${file} DIRECTORY)
+     install(FILES ${file}
+-      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1/${dir}
++      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dir}
+       COMPONENT ${CXX_HEADER_TARGET}
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+     )
+@@ -265,7 +265,7 @@ if (LIBCXX_INSTALL_HEADERS)
+ 
+   # Install the generated header as __config.
+   install(FILES ${LIBCXX_BINARY_DIR}/__generated_config
+-    DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1
++    DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1
+     PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+     RENAME __config
+     COMPONENT ${CXX_HEADER_TARGET})
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index 2001c09761d9..5bd11ea6b400 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -344,21 +344,21 @@ if (LIBCXX_INSTALL_LIBRARY)
+     install(TARGETS cxx_shared
+       ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+       LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+-      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}bin COMPONENT cxx)
++      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
+   endif()
+ 
+   if (LIBCXX_INSTALL_STATIC_LIBRARY)
+     install(TARGETS cxx_static
+       ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+       LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+-      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}bin COMPONENT cxx)
++      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
+   endif()
+ 
+   if(LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY)
+     install(TARGETS cxx_experimental
+       LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+       ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+-      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}bin COMPONENT cxx)
++      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
+   endif()
+ 
+   # NOTE: This install command must go after the cxx install command otherwise
diff --git a/pkgs/development/compilers/llvm/11/libc++abi/default.nix b/pkgs/development/compilers/llvm/11/libc++abi/default.nix
index c35ec706a02..a79a0d2f07a 100644
--- a/pkgs/development/compilers/llvm/11/libc++abi/default.nix
+++ b/pkgs/development/compilers/llvm/11/libc++abi/default.nix
@@ -8,20 +8,7 @@ stdenv.mkDerivation {
 
   src = fetch "libcxxabi" "1azcf31mxw59hb1x17xncnm3dyw90ylh8rqx462lvypqh3nr6c8l";
 
-  nativeBuildInputs = [ cmake ];
-  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD && !stdenv.hostPlatform.isWasm) libunwind;
-
-  cmakeFlags = lib.optionals (stdenv.hostPlatform.useLLVM or false) [
-    "-DLLVM_ENABLE_LIBCXX=ON"
-    "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
-  ] ++ lib.optionals stdenv.hostPlatform.isWasm [
-    "-DLIBCXXABI_ENABLE_THREADS=OFF"
-    "-DLIBCXXABI_ENABLE_EXCEPTIONS=OFF"
-  ] ++ lib.optionals (!enableShared) [
-    "-DLIBCXXABI_ENABLE_SHARED=OFF"
-  ];
-
-  patches = [ ./no-threads.patch ];
+  outputs = [ "out" "dev" ];
 
   postUnpack = ''
     unpackFile ${libcxx.src}
@@ -36,6 +23,24 @@ stdenv.mkDerivation {
     patch -p1 -d llvm -i ${./wasm.patch}
   '';
 
+  patches = [
+    ./no-threads.patch
+    ./gnu-install-dirs.patch
+  ];
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD && !stdenv.hostPlatform.isWasm) libunwind;
+
+  cmakeFlags = lib.optionals (stdenv.hostPlatform.useLLVM or false) [
+    "-DLLVM_ENABLE_LIBCXX=ON"
+    "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
+  ] ++ lib.optionals stdenv.hostPlatform.isWasm [
+    "-DLIBCXXABI_ENABLE_THREADS=OFF"
+    "-DLIBCXXABI_ENABLE_EXCEPTIONS=OFF"
+  ] ++ lib.optionals (!enableShared) [
+    "-DLIBCXXABI_ENABLE_SHARED=OFF"
+  ];
+
   installPhase = if stdenv.isDarwin
     then ''
       for file in lib/*.dylib; do
diff --git a/pkgs/development/compilers/llvm/11/libc++abi/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/11/libc++abi/gnu-install-dirs.patch
new file mode 100644
index 00000000000..10651c1255e
--- /dev/null
+++ b/pkgs/development/compilers/llvm/11/libc++abi/gnu-install-dirs.patch
@@ -0,0 +1,34 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 36c6b2249e2b..a93c13ccaed9 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -24,6 +24,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXXABI_STANDALONE_BUILD)
+   project(libcxxabi CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxxabi)
+   set(PACKAGE_VERSION 11.1.0)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+@@ -160,17 +162,17 @@ string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
+ 
+ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+-  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
++  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBCXXABI_LIBRARY_DIR /${LIBCXXABI_LIBDIR_SUBDIR})
+     string(APPEND LIBCXXABI_INSTALL_LIBRARY_DIR /${LIBCXXABI_LIBDIR_SUBDIR})
+   endif()
+ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+   set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+-  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LIBCXXABI_LIBDIR_SUFFIX})
++  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX})
+ else()
+   set(LIBCXXABI_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXXABI_LIBDIR_SUFFIX})
+-  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LIBCXXABI_LIBDIR_SUFFIX})
++  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX})
+ endif()
+ 
+ set(LIBCXXABI_INSTALL_PREFIX "" CACHE STRING "Define libc++abi destination prefix.")
diff --git a/pkgs/development/compilers/llvm/11/libunwind/default.nix b/pkgs/development/compilers/llvm/11/libunwind/default.nix
index 0c635cabc0a..6b095f4feae 100644
--- a/pkgs/development/compilers/llvm/11/libunwind/default.nix
+++ b/pkgs/development/compilers/llvm/11/libunwind/default.nix
@@ -8,6 +8,12 @@ stdenv.mkDerivation rec {
 
   src = fetch pname "1vpqs2c358v8fbr1r8jmzkfqk12jllimjcfmgxga127ksq9b37nj";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
+  outputs = [ "out" "dev" ];
+
   nativeBuildInputs = [ cmake ];
 
   cmakeFlags = lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF";
diff --git a/pkgs/development/compilers/llvm/11/libunwind/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/11/libunwind/gnu-install-dirs.patch
new file mode 100644
index 00000000000..b5b9c209278
--- /dev/null
+++ b/pkgs/development/compilers/llvm/11/libunwind/gnu-install-dirs.patch
@@ -0,0 +1,34 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index e44a103648f9..aaf1f9555d7f 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -18,6 +18,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBUNWIND_STANDALONE_BUILD)
+   project(libunwind LANGUAGES C CXX ASM)
+ 
++  include(GNUInstallDirs)
++
+   # Rely on llvm-config.
+   set(CONFIG_OUTPUT)
+   if(NOT LLVM_CONFIG_PATH)
+@@ -192,17 +194,17 @@ string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
+ 
+ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBUNWIND_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+     string(APPEND LIBUNWIND_INSTALL_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+   endif()
+ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX})
+ else()
+   set(LIBUNWIND_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBUNWIND_LIBDIR_SUFFIX})
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX})
+ endif()
+ 
+ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBUNWIND_LIBRARY_DIR})
diff --git a/pkgs/development/compilers/llvm/11/lld/default.nix b/pkgs/development/compilers/llvm/11/lld/default.nix
index 1a16184a6e7..3ee5ba6e5a6 100644
--- a/pkgs/development/compilers/llvm/11/lld/default.nix
+++ b/pkgs/development/compilers/llvm/11/lld/default.nix
@@ -1,8 +1,9 @@
 { lib, stdenv
+, buildLlvmTools
 , fetch
 , cmake
 , libxml2
-, llvm
+, libllvm
 , version
 }:
 
@@ -12,15 +13,20 @@ stdenv.mkDerivation rec {
 
   src = fetch pname "1kk61i7z5bi9i11rzsd2b388d42if1c7a45zkaa4mk0yps67hyh1";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ llvm libxml2 ];
+  buildInputs = [ libllvm libxml2 ];
 
-  outputs = [ "out" "dev" ];
+  cmakeFlags = [
+    "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
+  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+  ];
 
-  postInstall = ''
-    moveToOutput include "$dev"
-    moveToOutput lib "$dev"
-  '';
+  outputs = [ "out" "lib" "dev" ];
 
   meta = {
     description = "The LLVM Linker";
diff --git a/pkgs/development/compilers/llvm/11/lld/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/11/lld/gnu-install-dirs.patch
new file mode 100644
index 00000000000..19cf5526aa5
--- /dev/null
+++ b/pkgs/development/compilers/llvm/11/lld/gnu-install-dirs.patch
@@ -0,0 +1,68 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 040bb2c8f6d7..f765f0096d97 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -6,6 +6,8 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   set(CMAKE_INCLUDE_CURRENT_DIR ON)
+   set(LLD_BUILT_STANDALONE TRUE)
+ 
++  include(GNUInstallDirs)
++
+   find_program(LLVM_CONFIG_PATH "llvm-config" DOC "Path to llvm-config binary")
+   if(NOT LLVM_CONFIG_PATH)
+     message(FATAL_ERROR "llvm-config not found: specify LLVM_CONFIG_PATH")
+@@ -205,7 +207,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/cmake/modules/AddLLD.cmake b/cmake/modules/AddLLD.cmake
+index 23df41312403..d62372c88de7 100644
+--- a/cmake/modules/AddLLD.cmake
++++ b/cmake/modules/AddLLD.cmake
+@@ -20,9 +20,9 @@ macro(add_lld_library name)
+     install(TARGETS ${name}
+       COMPONENT ${name}
+       ${export_to_lldtargets}
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      RUNTIME DESTINATION bin)
++      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+     if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+       add_llvm_install_targets(install-${name}
+@@ -54,7 +54,7 @@ macro(add_lld_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_lldtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -69,5 +69,5 @@ endmacro()
+ macro(add_lld_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/tools/lld/CMakeLists.txt b/tools/lld/CMakeLists.txt
+index e6f72fcd3488..d903609e6e4f 100644
+--- a/tools/lld/CMakeLists.txt
++++ b/tools/lld/CMakeLists.txt
+@@ -21,7 +21,7 @@ target_link_libraries(lld
+   )
+ 
+ install(TARGETS lld
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ if(NOT LLD_SYMLINKS_TO_CREATE)
+   set(LLD_SYMLINKS_TO_CREATE lld-link ld.lld ld64.lld wasm-ld)
diff --git a/pkgs/development/compilers/llvm/11/lldb/default.nix b/pkgs/development/compilers/llvm/11/lldb/default.nix
index fc9b471ec9a..2979a46a6cc 100644
--- a/pkgs/development/compilers/llvm/11/lldb/default.nix
+++ b/pkgs/development/compilers/llvm/11/lldb/default.nix
@@ -7,8 +7,8 @@
 , which
 , libedit
 , libxml2
-, llvm
-, clang-unwrapped
+, libllvm
+, libclang
 , python3
 , version
 , darwin
@@ -22,19 +22,22 @@ stdenv.mkDerivation (rec {
 
   src = fetch pname "1vlyg015dyng43xqb8cg2l6r9ix8klibxsajazbfnckdnh54hwxj";
 
-  patches = [ ./procfs.patch ];
+  patches = [
+    ./procfs.patch
+    ./gnu-install-dirs.patch
+  ];
+
+  outputs = [ "out" "lib" "dev" ];
 
-  nativeBuildInputs = [ cmake python3 which swig lit ]
-    ++ lib.optionals enableManpages [ python3.pkgs.sphinx python3.pkgs.recommonmark ];
+  nativeBuildInputs = [
+    cmake python3 which swig lit
+  ] ++ lib.optionals enableManpages [
+    python3.pkgs.sphinx python3.pkgs.recommonmark
+  ];
 
   buildInputs = [
-    ncurses
-    zlib
-    libedit
-    libxml2
-    llvm
-  ]
-  ++ lib.optionals stdenv.isDarwin [
+    ncurses zlib libedit libxml2 libllvm
+  ] ++ lib.optionals stdenv.isDarwin [
     darwin.libobjc
     darwin.apple_sdk.libs.xpc
     darwin.apple_sdk.frameworks.Foundation
@@ -46,8 +49,9 @@ stdenv.mkDerivation (rec {
   hardeningDisable = [ "format" ];
 
   cmakeFlags = [
+    "-DLLDB_INCLUDE_TESTS=${if doCheck then "YES" else "NO"}"
     "-DLLVM_ENABLE_RTTI=OFF"
-    "-DClang_DIR=${clang-unwrapped}/lib/cmake"
+    "-DClang_DIR=${libclang.dev}/lib/cmake"
     "-DLLVM_EXTERNAL_LIT=${lit}/bin/lit"
   ] ++ lib.optionals stdenv.isDarwin [
     "-DLLDB_USE_SYSTEM_DEBUGSERVER=ON"
@@ -57,33 +61,38 @@ stdenv.mkDerivation (rec {
     "-DLLVM_ENABLE_SPHINX=ON"
     "-DSPHINX_OUTPUT_MAN=ON"
     "-DSPHINX_OUTPUT_HTML=OFF"
+  ] ++ lib.optionals doCheck [
+    "-DLLDB_TEST_C_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
+    "-DLLDB_TEST_CXX_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++"
   ];
 
+  doCheck = false;
+
   postInstall = ''
     # Editor support
     # vscode:
     install -D ../tools/lldb-vscode/package.json $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/package.json
     mkdir -p $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
-    ln -s $out/bin/lldb-vscode $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
+    ln -s $out/bin/llvm-vscode $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
   '';
 
   meta = with lib; {
     description = "A next-generation high-performance debugger";
-    homepage = "https://lldb.llvm.org";
-    license = licenses.ncsa;
-    platforms = platforms.all;
+    homepage    = "https://lldb.llvm.org";
+    license     = licenses.ncsa;
+    platforms   = platforms.all;
   };
 } // lib.optionalAttrs enableManpages {
   pname = "lldb-manpages";
 
   buildPhase = ''
-    make docs-lldb-man
+    make docs-man
   '';
 
   propagatedBuildInputs = [];
 
+  # manually install lldb man page
   installPhase = ''
-    # manually install lldb man page
     mkdir -p $out/share/man/man1
     install docs/man/lldb.1 -t $out/share/man/man1/
   '';
diff --git a/pkgs/development/compilers/llvm/11/lldb/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/11/lldb/gnu-install-dirs.patch
new file mode 100644
index 00000000000..a4769109523
--- /dev/null
+++ b/pkgs/development/compilers/llvm/11/lldb/gnu-install-dirs.patch
@@ -0,0 +1,65 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index bf748020ea40..34103d2b5e1a 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -17,6 +17,8 @@ set(CMAKE_MODULE_PATH
+ # If we are not building as part of LLVM, build LLDB as a standalone project,
+ # using LLVM as an external library.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
++  include(GNUInstallDirs)
++
+   project(lldb)
+   include(LLDBStandalone)
+ 
+diff --git a/cmake/modules/AddLLDB.cmake b/cmake/modules/AddLLDB.cmake
+index 4ed5c647c5d2..89f96e710d55 100644
+--- a/cmake/modules/AddLLDB.cmake
++++ b/cmake/modules/AddLLDB.cmake
+@@ -107,13 +107,13 @@ function(add_lldb_library name)
+   endif()
+ 
+   if(PARAM_SHARED)
+-    set(install_dest lib${LLVM_LIBDIR_SUFFIX})
++    set(install_dest ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+     if(PARAM_INSTALL_PREFIX)
+       set(install_dest ${PARAM_INSTALL_PREFIX})
+     endif()
+     # RUNTIME is relevant for DLL platforms, FRAMEWORK for macOS
+     install(TARGETS ${name} COMPONENT ${name}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       LIBRARY DESTINATION ${install_dest}
+       ARCHIVE DESTINATION ${install_dest}
+       FRAMEWORK DESTINATION ${install_dest})
+diff --git a/cmake/modules/LLDBConfig.cmake b/cmake/modules/LLDBConfig.cmake
+index 8465cfe3b7b7..01b7eae136e2 100644
+--- a/cmake/modules/LLDBConfig.cmake
++++ b/cmake/modules/LLDBConfig.cmake
+@@ -245,7 +245,7 @@ include_directories(BEFORE
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+@@ -254,7 +254,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/tools/intel-features/CMakeLists.txt b/tools/intel-features/CMakeLists.txt
+index efba2f74904f..e08413b1dbb1 100644
+--- a/tools/intel-features/CMakeLists.txt
++++ b/tools/intel-features/CMakeLists.txt
+@@ -65,4 +65,4 @@ if (LLDB_ENABLE_PYTHON AND LLDB_BUILD_INTEL_PT)
+ endif()
+ 
+ install(TARGETS lldbIntelFeatures
+-  LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
diff --git a/pkgs/development/compilers/llvm/11/llvm/default.nix b/pkgs/development/compilers/llvm/11/llvm/default.nix
index ee2fe9c90b2..c8033b585cb 100644
--- a/pkgs/development/compilers/llvm/11/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/11/llvm/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv
+, pkgsBuildBuild
 , fetch
 , cmake
 , python3
@@ -10,15 +11,15 @@
 , version
 , release_version
 , zlib
-, buildPackages
+, buildLlvmTools
 , debugVersion ? false
 , enableManpages ? false
-, enableSharedLibraries ? true
+, enableSharedLibraries ? !stdenv.hostPlatform.isStatic
 , enablePFM ? !(stdenv.isDarwin
   || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
   || stdenv.isAarch32 # broken for the armv7l builder
 )
-, enablePolly ? false
+, enablePolly ? false # TODO should be on by default
 }:
 
 let
@@ -44,8 +45,7 @@ in stdenv.mkDerivation (rec {
     mv polly-* $sourceRoot/tools/polly
   '';
 
-  outputs = [ "out" "python" ]
-    ++ optional enableSharedLibraries "lib";
+  outputs = [ "out" "lib" "dev" "python" ];
 
   nativeBuildInputs = [ cmake python3 ]
     ++ optionals enableManpages [ python3.pkgs.sphinx python3.pkgs.recommonmark ];
@@ -55,10 +55,14 @@ in stdenv.mkDerivation (rec {
 
   propagatedBuildInputs = [ ncurses zlib ];
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
+
   postPatch = optionalString stdenv.isDarwin ''
     substituteInPlace cmake/modules/AddLLVM.cmake \
       --replace 'set(_install_name_dir INSTALL_NAME_DIR "@rpath")' "set(_install_name_dir)" \
-      --replace 'set(_install_rpath "@loader_path/../lib''${LLVM_LIBDIR_SUFFIX}" ''${extra_libdir})' ""
+      --replace 'set(_install_rpath "@loader_path/../''${CMAKE_INSTALL_LIBDIR}''${LLVM_LIBDIR_SUFFIX}" ''${extra_libdir})' ""
   ''
   # Patch llvm-config to return correct library path based on --link-{shared,static}.
   + optionalString (enableSharedLibraries) ''
@@ -99,6 +103,7 @@ in stdenv.mkDerivation (rec {
   LDFLAGS = optionalString (enableSharedLibraries && !stdenv.isDarwin) "-Wl,--build-id=sha1";
 
   cmakeFlags = with stdenv; [
+    "-DLLVM_INSTALL_CMAKE_DIR=${placeholder "dev"}/lib/cmake/llvm/"
     "-DCMAKE_BUILD_TYPE=${if debugVersion then "Debug" else "Release"}"
     "-DLLVM_INSTALL_UTILS=ON"  # Needed by rustc
     "-DLLVM_BUILD_TESTS=ON"
@@ -122,7 +127,20 @@ in stdenv.mkDerivation (rec {
     "-DCAN_TARGET_i386=false"
   ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
     "-DCMAKE_CROSSCOMPILING=True"
-    "-DLLVM_TABLEGEN=${buildPackages.llvm_11}/bin/llvm-tblgen"
+    "-DLLVM_TABLEGEN=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+    (
+      let
+        nativeCC = pkgsBuildBuild.targetPackages.stdenv.cc;
+        nativeBintools = nativeCC.bintools.bintools;
+        nativeToolchainFlags = [
+          "-DCMAKE_C_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}cc"
+          "-DCMAKE_CXX_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}c++"
+          "-DCMAKE_AR=${nativeBintools}/bin/${nativeBintools.targetPrefix}ar"
+          "-DCMAKE_STRIP=${nativeBintools}/bin/${nativeBintools.targetPrefix}strip"
+          "-DCMAKE_RANLIB=${nativeBintools}/bin/${nativeBintools.targetPrefix}ranlib"
+        ];
+      in "-DCROSS_TOOLCHAIN_FLAGS_NATIVE:list=${lib.concatStringsSep ";" nativeToolchainFlags}"
+    )
   ];
 
   postBuild = ''
@@ -136,20 +154,19 @@ in stdenv.mkDerivation (rec {
   postInstall = ''
     mkdir -p $python/share
     mv $out/share/opt-viewer $python/share/opt-viewer
-  ''
-  + optionalString enableSharedLibraries ''
-    moveToOutput "lib/libLLVM-*" "$lib"
-    moveToOutput "lib/libLLVM${stdenv.hostPlatform.extensions.sharedLibrary}" "$lib"
-  ''
-  + optionalString (enableSharedLibraries && (!stdenv.isDarwin)) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM-" "$lib/lib/libLLVM-"
+    moveToOutput "bin/llvm-config*" "$dev"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
+      --replace "\''${_IMPORT_PREFIX}/lib/lib" "$lib/lib/lib" \
+      --replace "$out/bin/llvm-config" "$dev/bin/llvm-config"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMConfig.cmake" \
+      --replace 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}")' 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}'"$lib"'")'
   ''
   + optionalString (stdenv.isDarwin && enableSharedLibraries) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM.dylib" "$lib/lib/libLLVM.dylib"
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${shortVersion}.dylib
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${release_version}.dylib
+  ''
+  + optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    cp NATIVE/bin/llvm-config $dev/bin/llvm-config-native
   '';
 
   doCheck = stdenv.isLinux && (!stdenv.isx86_32) && (!stdenv.hostPlatform.isMusl);
diff --git a/pkgs/development/compilers/llvm/11/llvm/gnu-install-dirs-polly.patch b/pkgs/development/compilers/llvm/11/llvm/gnu-install-dirs-polly.patch
new file mode 100644
index 00000000000..fff2d4953e9
--- /dev/null
+++ b/pkgs/development/compilers/llvm/11/llvm/gnu-install-dirs-polly.patch
@@ -0,0 +1,106 @@
+diff --git a/tools/polly/CMakeLists.txt b/tools/polly/CMakeLists.txt
+index 9939097f743e..8cc538da912a 100644
+--- a/tools/polly/CMakeLists.txt
++++ b/tools/polly/CMakeLists.txt
+@@ -2,7 +2,11 @@
+ if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   project(Polly)
+   cmake_minimum_required(VERSION 3.4.3)
++endif()
++
++include(GNUInstallDirs)
+ 
++if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   # Where is LLVM installed?
+   find_package(LLVM CONFIG REQUIRED)
+   set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+@@ -145,14 +149,14 @@ include_directories(
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+     )
+ 
+   install(DIRECTORY ${POLLY_BINARY_DIR}/include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN "CMakeFiles" EXCLUDE
+diff --git a/tools/polly/cmake/CMakeLists.txt b/tools/polly/cmake/CMakeLists.txt
+index 211f95512717..f9e04a4844b6 100644
+--- a/tools/polly/cmake/CMakeLists.txt
++++ b/tools/polly/cmake/CMakeLists.txt
+@@ -79,18 +79,18 @@ file(GENERATE
+ 
+ # Generate PollyConfig.cmake for the install tree.
+ unset(POLLY_EXPORTS)
+-set(POLLY_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
++set(POLLY_INSTALL_PREFIX "")
+ set(POLLY_CONFIG_LLVM_CMAKE_DIR "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}")
++set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
++set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+ if (POLLY_BUNDLED_ISL)
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
+-    "${POLLY_INSTALL_PREFIX}/include/polly"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}/polly"
+     )
+ else()
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+     ${ISL_INCLUDE_DIRS}
+     )
+ endif()
+@@ -100,12 +100,12 @@ endif()
+ foreach(tgt IN LISTS POLLY_CONFIG_EXPORTED_TARGETS)
+   get_target_property(tgt_type ${tgt} TYPE)
+   if (tgt_type STREQUAL "EXECUTABLE")
+-    set(tgt_prefix "bin/")
++    set(tgt_prefix "${CMAKE_INSTALL_BINDIR}/")
+   else()
+-    set(tgt_prefix "lib/")
++    set(tgt_prefix "${CMAKE_INSTALL_LIBDIR}/")
+   endif()
+ 
+-  set(tgt_path "${CMAKE_INSTALL_PREFIX}/${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
++  set(tgt_path "${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
+   file(RELATIVE_PATH tgt_path ${POLLY_CONFIG_CMAKE_DIR} ${tgt_path})
+ 
+   if (NOT tgt_type STREQUAL "INTERFACE_LIBRARY")
+diff --git a/tools/polly/cmake/polly_macros.cmake b/tools/polly/cmake/polly_macros.cmake
+index 86de6f10686e..91f30891ccbe 100644
+--- a/tools/polly/cmake/polly_macros.cmake
++++ b/tools/polly/cmake/polly_macros.cmake
+@@ -44,8 +44,8 @@ macro(add_polly_library name)
+   if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LLVMPolly")
+     install(TARGETS ${name}
+       EXPORT LLVMExports
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++	  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   endif()
+   set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+ endmacro(add_polly_library)
+diff --git a/tools/polly/lib/External/CMakeLists.txt b/tools/polly/lib/External/CMakeLists.txt
+index 1039079cb49c..28b499ae1e9e 100644
+--- a/tools/polly/lib/External/CMakeLists.txt
++++ b/tools/polly/lib/External/CMakeLists.txt
+@@ -275,7 +275,7 @@ if (POLLY_BUNDLED_ISL)
+     install(DIRECTORY
+       ${ISL_SOURCE_DIR}/include/
+       ${ISL_BINARY_DIR}/include/
+-      DESTINATION include/polly
++      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/polly
+       FILES_MATCHING
+       PATTERN "*.h"
+       PATTERN "CMakeFiles" EXCLUDE
diff --git a/pkgs/development/compilers/llvm/11/llvm/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/11/llvm/gnu-install-dirs.patch
new file mode 100644
index 00000000000..29df98a693f
--- /dev/null
+++ b/pkgs/development/compilers/llvm/11/llvm/gnu-install-dirs.patch
@@ -0,0 +1,417 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 247ad36d3845..815e2c4ba955 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -269,15 +269,21 @@ if (CMAKE_BUILD_TYPE AND
+   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+ endif()
+ 
++include(GNUInstallDirs)
++
+ set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
+ 
+-set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
++set(LLVM_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE STRING
++    "Path for binary subdirectory (defaults to 'bin')")
+ mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+ 
+ set(LLVM_UTILS_INSTALL_DIR "${LLVM_TOOLS_INSTALL_DIR}" CACHE STRING
+     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
+ mark_as_advanced(LLVM_UTILS_INSTALL_DIR)
+ 
++set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
++	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
++
+ # They are used as destination of target generators.
+ set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
+ set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
+@@ -559,9 +565,9 @@ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
+ option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
+ option (LLVM_ENABLE_BINDINGS "Build bindings." ON)
+ 
+-set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
++set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html"
+     CACHE STRING "Doxygen-generated HTML documentation install directory")
+-set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
++set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html"
+     CACHE STRING "OCamldoc-generated HTML documentation install directory")
+ 
+ option (LLVM_BUILD_EXTERNAL_COMPILER_RT
+@@ -1107,7 +1113,7 @@ endif()
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/llvm include/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -1119,7 +1125,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm ${LLVM_INCLUDE_DIR}/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -1134,13 +1140,13 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   if (LLVM_INSTALL_MODULEMAPS)
+     install(DIRECTORY include/llvm include/llvm-c
+-            DESTINATION include
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+             COMPONENT llvm-headers
+             FILES_MATCHING
+             PATTERN "module.modulemap"
+             )
+     install(FILES include/llvm/module.install.modulemap
+-            DESTINATION include/llvm
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm
+             COMPONENT llvm-headers
+             RENAME "module.extern.modulemap"
+             )
+diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
+index b74adc11ade9..a5aa258cde30 100644
+--- a/cmake/modules/AddLLVM.cmake
++++ b/cmake/modules/AddLLVM.cmake
+@@ -766,9 +766,9 @@ macro(add_llvm_library name)
+ 
+       install(TARGETS ${name}
+               ${export_to_llvmexports}
+-              LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+-              ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+-              RUNTIME DESTINATION bin COMPONENT ${name})
++              LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
++              ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
++              RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ${name})
+ 
+       if (NOT LLVM_ENABLE_IDE)
+         add_llvm_install_targets(install-${name}
+@@ -981,7 +981,7 @@ function(process_llvm_pass_plugins)
+           "set(LLVM_STATIC_EXTENSIONS ${LLVM_STATIC_EXTENSIONS})")
+       install(FILES
+           ${llvm_cmake_builddir}/LLVMConfigExtensions.cmake
+-          DESTINATION ${LLVM_INSTALL_PACKAGE_DIR}
++          DESTINATION ${LLVM_INSTALL_CMAKE_DIR}
+           COMPONENT cmake-exports)
+ 
+       set(ExtensionDef "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def")
+@@ -1201,7 +1201,7 @@ macro(add_llvm_example name)
+   endif()
+   add_llvm_executable(${name} ${ARGN})
+   if( LLVM_BUILD_EXAMPLES )
+-    install(TARGETS ${name} RUNTIME DESTINATION examples)
++    install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   endif()
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endmacro(add_llvm_example name)
+@@ -1819,7 +1819,7 @@ function(llvm_install_library_symlink name dest type)
+   set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
+   set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
+ 
+-  set(output_dir lib${LLVM_LIBDIR_SUFFIX})
++  set(output_dir ${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   if(WIN32 AND "${type}" STREQUAL "SHARED")
+     set(output_dir bin)
+   endif()
+@@ -1836,7 +1836,7 @@ function(llvm_install_library_symlink name dest type)
+   endif()
+ endfunction()
+ 
+-function(llvm_install_symlink name dest)
++function(llvm_install_symlink name dest output_dir)
+   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
+   foreach(path ${CMAKE_MODULE_PATH})
+     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
+@@ -1859,7 +1859,7 @@ function(llvm_install_symlink name dest)
+   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
+ 
+   install(SCRIPT ${INSTALL_SYMLINK}
+-          CODE "install_symlink(${full_name} ${full_dest} ${LLVM_TOOLS_INSTALL_DIR})"
++          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+           COMPONENT ${component})
+ 
+   if (NOT LLVM_ENABLE_IDE AND NOT ARG_ALWAYS_GENERATE)
+@@ -1942,7 +1942,8 @@ function(add_llvm_tool_symlink link_name target)
+     endif()
+ 
+     if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
+-      llvm_install_symlink(${link_name} ${target})
++      GNUInstallDirs_get_absolute_install_dir(output_dir LLVM_TOOLS_INSTALL_DIR)
++      llvm_install_symlink(${link_name} ${target} ${output_dir})
+     endif()
+   endif()
+ endfunction()
+@@ -2064,9 +2065,9 @@ function(llvm_setup_rpath name)
+ 
+   if (APPLE)
+     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
+-    set(_install_rpath "@loader_path/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "@loader_path/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+   elseif(UNIX)
+-    set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
+       set_property(TARGET ${name} APPEND_STRING PROPERTY
+                    LINK_FLAGS " -Wl,-z,origin ")
+diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
+index 554046b20edf..4d1ad980641e 100644
+--- a/cmake/modules/AddOCaml.cmake
++++ b/cmake/modules/AddOCaml.cmake
+@@ -144,9 +144,9 @@ function(add_ocaml_library name)
+   endforeach()
+ 
+   if( APPLE )
+-    set(ocaml_rpath "@executable_path/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "@executable_path/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   elseif( UNIX )
+-    set(ocaml_rpath "\\$ORIGIN/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "\\$ORIGIN/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   endif()
+   list(APPEND ocaml_flags "-ldopt" "-Wl,-rpath,${ocaml_rpath}")
+ 
+diff --git a/cmake/modules/AddSphinxTarget.cmake b/cmake/modules/AddSphinxTarget.cmake
+index b5babb30abcf..190b1222a9f9 100644
+--- a/cmake/modules/AddSphinxTarget.cmake
++++ b/cmake/modules/AddSphinxTarget.cmake
+@@ -84,7 +84,7 @@ function (add_sphinx_target builder project)
+         endif()
+       elseif (builder STREQUAL html)
+         string(TOUPPER "${project}" project_upper)
+-        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
++        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/html"
+             CACHE STRING "HTML documentation install directory for ${project}")
+ 
+         # '/.' indicates: copy the contents of the directory directly into
+diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
+index 4b8879f65fe4..f01920bcc60f 100644
+--- a/cmake/modules/CMakeLists.txt
++++ b/cmake/modules/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
++set(LLVM_INSTALL_PACKAGE_DIR ${LLVM_INSTALL_CMAKE_DIR} CACHE STRING "Path for CMake subdirectory (defaults to 'cmake/llvm')")
+ set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+ 
+ # First for users who use an installed LLVM, create the LLVMExports.cmake file.
+@@ -108,13 +108,13 @@ foreach(p ${_count})
+   set(LLVM_CONFIG_CODE "${LLVM_CONFIG_CODE}
+ get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
+ endforeach(p)
+-set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
++set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
+ set(LLVM_CONFIG_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
+ set(LLVM_CONFIG_MAIN_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
+-set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
++set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
+ set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
+ set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
+-set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/bin")
++set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}")
+ 
+ # Generate a default location for lit
+ if (LLVM_INSTALL_UTILS AND LLVM_BUILD_UTILS)
+diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
+index 09fed8085c23..aa79f192abf0 100644
+--- a/cmake/modules/LLVMInstallSymlink.cmake
++++ b/cmake/modules/LLVMInstallSymlink.cmake
+@@ -10,7 +10,7 @@ function(install_symlink name target outdir)
+     set(LINK_OR_COPY copy)
+   endif()
+ 
+-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
++  set(bindir "${DESTDIR}${outdir}/")
+ 
+   message(STATUS "Creating ${name}")
+ 
+diff --git a/docs/CMake.rst b/docs/CMake.rst
+index 1f908d3e95b1..1315e0aa40e1 100644
+--- a/docs/CMake.rst
++++ b/docs/CMake.rst
+@@ -196,7 +196,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
+ **LLVM_LIBDIR_SUFFIX**:STRING
+   Extra suffix to append to the directory where libraries are to be
+   installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
+-  to install libraries to ``/usr/lib64``.
++  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
+ 
+ **CMAKE_C_FLAGS**:STRING
+   Extra flags to use when compiling C source files.
+@@ -516,8 +516,8 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
+   The path to install Doxygen-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/doxygen-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
+ 
+ **LLVM_ENABLE_SPHINX**:BOOL
+   If specified, CMake will search for the ``sphinx-build`` executable and will make
+@@ -548,13 +548,33 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_SPHINX_HTML_DIR**:STRING
+   The path to install Sphinx-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/html`.
+ 
+ **LLVM_INSTALL_OCAMLDOC_HTML_DIR**:STRING
+   The path to install OCamldoc-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/ocaml-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html`.
++
++**CMAKE_INSTALL_BINDIR**:STRING
++  The path to install binary tools, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `bin`.
++
++**CMAKE_INSTALL_LIBDIR**:STRING
++  The path to install libraries, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `lib`.
++
++**CMAKE_INSTALL_INCLUDEDIR**:STRING
++  The path to install header files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `include`.
++
++**CMAKE_INSTALL_DOCDIR**:STRING
++  The path to install documentation, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/doc`.
++
++**CMAKE_INSTALL_MANDIR**:STRING
++  The path to install manpage files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/man`.
+ 
+ **LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
+   macOS Only: If enabled CMake will generate a target named
+@@ -752,9 +772,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
+ 
+ This file is available in two different locations.
+ 
+-* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
+-  ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
+-  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
++* ``<LLVM_INSTALL_PACKAGE_DIR>LLVMConfig.cmake`` where
++  ``<LLVM_INSTALL_PACKAGE_DIR>`` is the location where LLVM CMake modules are
++  installed as part of an installed version of LLVM. This is typically
++  ``cmake/llvm/`` within the lib directory. On Linux, this is typically
++  ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
+ 
+ * ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
+   ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
+diff --git a/examples/Bye/CMakeLists.txt b/examples/Bye/CMakeLists.txt
+index bb96edb4b4bf..678c22fb43c8 100644
+--- a/examples/Bye/CMakeLists.txt
++++ b/examples/Bye/CMakeLists.txt
+@@ -14,6 +14,6 @@ if (NOT WIN32)
+     BUILDTREE_ONLY
+    )
+ 
+-  install(TARGETS ${name} RUNTIME DESTINATION examples)
++  install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endif()
+diff --git a/include/llvm/CMakeLists.txt b/include/llvm/CMakeLists.txt
+index b46319f24fc8..2feabd1954e4 100644
+--- a/include/llvm/CMakeLists.txt
++++ b/include/llvm/CMakeLists.txt
+@@ -5,5 +5,5 @@ add_subdirectory(Frontend)
+ # If we're doing an out-of-tree build, copy a module map for generated
+ # header files into the build area.
+ if (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+-  configure_file(module.modulemap.build module.modulemap COPYONLY)
++  configure_file(module.modulemap.build ${LLVM_INCLUDE_DIR}/module.modulemap COPYONLY)
+ endif (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
+index 63cef75368b7..6295478b1f3d 100644
+--- a/tools/llvm-config/BuildVariables.inc.in
++++ b/tools/llvm-config/BuildVariables.inc.in
+@@ -23,6 +23,10 @@
+ #define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
+ #define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
+ #define LLVM_LIBDIR_SUFFIX "@LLVM_LIBDIR_SUFFIX@"
++#define LLVM_INSTALL_BINDIR "@CMAKE_INSTALL_BINDIR@"
++#define LLVM_INSTALL_LIBDIR "@CMAKE_INSTALL_LIBDIR@"
++#define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
++#define LLVM_INSTALL_CMAKEDIR "@LLVM_INSTALL_CMAKE_DIR@"
+ #define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
+ #define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
+ #define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
+diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
+index 7e74b7c90816..f185e9283f83 100644
+--- a/tools/llvm-config/llvm-config.cpp
++++ b/tools/llvm-config/llvm-config.cpp
+@@ -358,12 +358,26 @@ int main(int argc, char **argv) {
+         ("-I" + ActiveIncludeDir + " " + "-I" + ActiveObjRoot + "/include");
+   } else {
+     ActivePrefix = CurrentExecPrefix;
+-    ActiveIncludeDir = ActivePrefix + "/include";
+-    SmallString<256> path(StringRef(LLVM_TOOLS_INSTALL_DIR));
+-    sys::fs::make_absolute(ActivePrefix, path);
+-    ActiveBinDir = std::string(path.str());
+-    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
+-    ActiveCMakeDir = ActiveLibDir + "/cmake/llvm";
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_INCLUDEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveIncludeDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_BINDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveBinDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveLibDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_CMAKEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveCMakeDir = std::string(path.str());
++    }
+     ActiveIncludeOption = "-I" + ActiveIncludeDir;
+   }
+ 
+diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
+index 2963f97cad88..69d66c9c9ca1 100644
+--- a/tools/lto/CMakeLists.txt
++++ b/tools/lto/CMakeLists.txt
+@@ -25,7 +25,7 @@ add_llvm_library(LTO SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES} DEPENDS
+     intrinsics_gen)
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/lto.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT LTO)
+ 
+ if (APPLE)
+diff --git a/tools/opt-viewer/CMakeLists.txt b/tools/opt-viewer/CMakeLists.txt
+index ead73ec13a8f..250362021f17 100644
+--- a/tools/opt-viewer/CMakeLists.txt
++++ b/tools/opt-viewer/CMakeLists.txt
+@@ -8,7 +8,7 @@ set (files
+ 
+ foreach (file ${files})
+   install(PROGRAMS ${file}
+-    DESTINATION share/opt-viewer
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/opt-viewer
+     COMPONENT opt-viewer)
+ endforeach (file)
+ 
+diff --git a/tools/remarks-shlib/CMakeLists.txt b/tools/remarks-shlib/CMakeLists.txt
+index e948496c603a..1f4df8a98b10 100644
+--- a/tools/remarks-shlib/CMakeLists.txt
++++ b/tools/remarks-shlib/CMakeLists.txt
+@@ -11,7 +11,7 @@ set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/Remarks.exports)
+ add_llvm_library(Remarks SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES})
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/Remarks.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT Remarks)
+ 
+ if (APPLE)
diff --git a/pkgs/development/compilers/llvm/12/clang/default.nix b/pkgs/development/compilers/llvm/12/clang/default.nix
index ab329e3d85d..3d1106dbc52 100644
--- a/pkgs/development/compilers/llvm/12/clang/default.nix
+++ b/pkgs/development/compilers/llvm/12/clang/default.nix
@@ -1,4 +1,5 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, libxml2, llvm, version, clang-tools-extra_src, python3, lld
+{ lib, stdenv, llvm_meta, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+, buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
 }:
@@ -18,26 +19,31 @@ let
       unpackFile ${clang-tools-extra_src}
     '';
 
-    nativeBuildInputs = [ cmake python3 lld ]
+    nativeBuildInputs = [ cmake python3 ]
       ++ lib.optional enableManpages python3.pkgs.sphinx
       ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-    buildInputs = [ libxml2 llvm ];
+    buildInputs = [ libxml2 libllvm ];
 
     cmakeFlags = [
       "-DCMAKE_CXX_FLAGS=-std=c++14"
       "-DCLANGD_BUILD_XPC=OFF"
+      "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
     ] ++ lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"
       "-DSPHINX_OUTPUT_MAN=ON"
       "-DSPHINX_OUTPUT_HTML=OFF"
       "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
     ];
 
     patches = [
       ./purity.patch
       # https://reviews.llvm.org/D51899
+      ./gnu-install-dirs.patch
     ];
 
     postPatch = ''
@@ -51,12 +57,12 @@ let
       sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
     '';
 
-    outputs = [ "out" "lib" "python" ];
+    outputs = [ "out" "lib" "dev" "python" ];
 
     # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${llvm}/lib/LLVMgold.so ]; then
-        ln -sv ${llvm}/lib/LLVMgold.so $out/lib
+      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
+        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
       fi
 
       ln -sv $out/bin/clang $out/bin/cpp
@@ -75,11 +81,14 @@ let
       fi
       mv $out/share/clang/*.py $python/share/clang
       rm $out/bin/c-index-test
+
+      mkdir -p $dev/bin
+      cp bin/clang-tblgen $dev/bin
     '';
 
     passthru = {
       isClang = true;
-      inherit llvm;
+      inherit libllvm;
     };
 
     meta = llvm_meta // {
diff --git a/pkgs/development/compilers/llvm/12/clang/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/clang/gnu-install-dirs.patch
new file mode 100644
index 00000000000..b834d386b4e
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/clang/gnu-install-dirs.patch
@@ -0,0 +1,235 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 9e74014134a0..976e6a1757fd 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -5,6 +5,8 @@ cmake_minimum_required(VERSION 3.13.4)
+ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
+   project(Clang)
+ 
++  include(GNUInstallDirs)
++
+   set(CMAKE_CXX_STANDARD 14 CACHE STRING "C++ standard to conform to")
+   set(CMAKE_CXX_STANDARD_REQUIRED YES)
+   set(CMAKE_CXX_EXTENSIONS NO)
+@@ -416,7 +418,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/clang include/clang-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -425,7 +427,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "CMakeFiles" EXCLUDE
+@@ -445,7 +447,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   add_custom_target(bash-autocomplete DEPENDS utils/bash-autocomplete.sh)
+   install(PROGRAMS utils/bash-autocomplete.sh
+-          DESTINATION share/clang
++          DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+           COMPONENT bash-autocomplete)
+   if(NOT LLVM_ENABLE_IDE)
+     add_llvm_install_targets(install-bash-autocomplete
+diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
+index 704278a0e93b..d25c8d325c71 100644
+--- a/cmake/modules/AddClang.cmake
++++ b/cmake/modules/AddClang.cmake
+@@ -123,9 +123,9 @@ macro(add_clang_library name)
+         install(TARGETS ${lib}
+           COMPONENT ${lib}
+           ${export_to_clangtargets}
+-          LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-          ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-          RUNTIME DESTINATION bin)
++          LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++          ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++          RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+         if (NOT LLVM_ENABLE_IDE)
+           add_llvm_install_targets(install-${lib}
+@@ -170,7 +170,7 @@ macro(add_clang_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_clangtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT LLVM_ENABLE_IDE)
+@@ -185,7 +185,7 @@ endmacro()
+ macro(add_clang_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+ 
+ function(clang_target_link_libraries target type)
+diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
+index b2c0ce8dd4a0..19e5443d8c25 100644
+--- a/lib/Headers/CMakeLists.txt
++++ b/lib/Headers/CMakeLists.txt
+@@ -215,7 +215,7 @@ set_target_properties(clang-resource-headers PROPERTIES
+   FOLDER "Misc"
+   RUNTIME_OUTPUT_DIRECTORY "${output_dir}")
+ 
+-set(header_install_dir lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++set(header_install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ install(
+   FILES ${files} ${generated_files}
+diff --git a/tools/c-index-test/CMakeLists.txt b/tools/c-index-test/CMakeLists.txt
+index ceef4b08637c..8efad5520ca4 100644
+--- a/tools/c-index-test/CMakeLists.txt
++++ b/tools/c-index-test/CMakeLists.txt
+@@ -54,7 +54,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
+        "@executable_path/../../lib")
+   else()
+-    set(INSTALL_DESTINATION bin)
++    set(INSTALL_DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endif()
+ 
+   install(TARGETS c-index-test
+diff --git a/tools/clang-format/CMakeLists.txt b/tools/clang-format/CMakeLists.txt
+index 35ecdb11253c..d77d75de0094 100644
+--- a/tools/clang-format/CMakeLists.txt
++++ b/tools/clang-format/CMakeLists.txt
+@@ -21,20 +21,20 @@ if( LLVM_LIB_FUZZING_ENGINE OR LLVM_USE_SANITIZE_COVERAGE )
+ endif()
+ 
+ install(PROGRAMS clang-format-bbedit.applescript
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-diff.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-sublime.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS git-clang-format
+-  DESTINATION bin
++  DESTINATION ${CMAKE_INSTALL_BINDIR}
+   COMPONENT clang-format)
+diff --git a/tools/clang-rename/CMakeLists.txt b/tools/clang-rename/CMakeLists.txt
+index cda8e29ec5b1..0134d8ccd70b 100644
+--- a/tools/clang-rename/CMakeLists.txt
++++ b/tools/clang-rename/CMakeLists.txt
+@@ -19,8 +19,8 @@ clang_target_link_libraries(clang-rename
+   )
+ 
+ install(PROGRAMS clang-rename.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+ install(PROGRAMS clang-rename.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
+index 51ff2e7e1565..1ed5f8a079a1 100644
+--- a/tools/libclang/CMakeLists.txt
++++ b/tools/libclang/CMakeLists.txt
+@@ -166,7 +166,7 @@ endif()
+ if(INTERNAL_INSTALL_PREFIX)
+   set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
+ else()
+-  set(LIBCLANG_HEADERS_INSTALL_DESTINATION include)
++  set(LIBCLANG_HEADERS_INSTALL_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+ endif()
+ 
+ install(DIRECTORY ../../include/clang-c
+@@ -196,7 +196,7 @@ foreach(PythonVersion ${CLANG_PYTHON_BINDINGS_VERSIONS})
+           COMPONENT
+             libclang-python-bindings
+           DESTINATION
+-            "lib${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
++            "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
+ endforeach()
+ if(NOT LLVM_ENABLE_IDE)
+   add_custom_target(libclang-python-bindings)
+diff --git a/tools/scan-build/CMakeLists.txt b/tools/scan-build/CMakeLists.txt
+index ec0702d76f18..d25d982f51da 100644
+--- a/tools/scan-build/CMakeLists.txt
++++ b/tools/scan-build/CMakeLists.txt
+@@ -47,7 +47,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+     install(PROGRAMS bin/${BinFile}
+-            DESTINATION bin
++            DESTINATION ${CMAKE_INSTALL_BINDIR}
+             COMPONENT scan-build)
+   endforeach()
+ 
+@@ -61,7 +61,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libexec/${LibexecFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/libexec/${LibexecFile})
+     install(PROGRAMS libexec/${LibexecFile}
+-            DESTINATION libexec
++            DESTINATION ${CMAKE_INSTALL_LIBEXECDIR}
+             COMPONENT scan-build)
+   endforeach()
+ 
+@@ -89,7 +89,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/scan-build/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-build/${ShareFile})
+     install(FILES share/scan-build/${ShareFile}
+-            DESTINATION share/scan-build
++            DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-build
+             COMPONENT scan-build)
+   endforeach()
+ 
+diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
+index dd3d33439299..fea19c12ce70 100644
+--- a/tools/scan-view/CMakeLists.txt
++++ b/tools/scan-view/CMakeLists.txt
+@@ -19,7 +19,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+     install(PROGRAMS bin/${BinFile}
+-            DESTINATION bin
++            DESTINATION ${CMAKE_INSTALL_BINDIR}
+             COMPONENT scan-view)
+   endforeach()
+ 
+@@ -33,7 +33,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-view/${ShareFile})
+     install(FILES share/${ShareFile}
+-            DESTINATION share/scan-view
++            DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-view
+             COMPONENT scan-view)
+   endforeach()
+ 
+diff --git a/utils/hmaptool/CMakeLists.txt b/utils/hmaptool/CMakeLists.txt
+index 62f2de0cb15c..6aa66825b6ec 100644
+--- a/utils/hmaptool/CMakeLists.txt
++++ b/utils/hmaptool/CMakeLists.txt
+@@ -10,7 +10,7 @@ add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HM
+ 
+ list(APPEND Depends ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HMAPTOOL})
+ install(PROGRAMS ${CLANG_HMAPTOOL}
+-        DESTINATION bin
++        DESTINATION ${CMAKE_INSTALL_BINDIR}
+         COMPONENT hmaptool)
+ 
+ add_custom_target(hmaptool ALL DEPENDS ${Depends})
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-X86-support-extension.patch b/pkgs/development/compilers/llvm/12/compiler-rt/X86-support-extension.patch
index f6f9336ad5a..f6f9336ad5a 100644
--- a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-X86-support-extension.patch
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/X86-support-extension.patch
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-armv7l.patch b/pkgs/development/compilers/llvm/12/compiler-rt/armv7l.patch
index 120cfe6feb2..120cfe6feb2 100644
--- a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-armv7l.patch
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/armv7l.patch
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-codesign.patch b/pkgs/development/compilers/llvm/12/compiler-rt/codesign.patch
index 3cc12b94b20..3cc12b94b20 100644
--- a/pkgs/development/compilers/llvm/12/compiler-rt/compiler-rt-codesign.patch
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/codesign.patch
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/default.nix b/pkgs/development/compilers/llvm/12/compiler-rt/default.nix
index bf7f4bc4312..b880a0071b9 100644
--- a/pkgs/development/compilers/llvm/12/compiler-rt/default.nix
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   inherit version;
   src = fetch pname "0d444qihq9jhqnfv003cr704v363va72zl6qaw2algj1c85cva45";
 
-  nativeBuildInputs = [ cmake python3 llvm ];
+  nativeBuildInputs = [ cmake python3 llvm.dev ];
   buildInputs = lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
   NIX_CFLAGS_COMPILE = [
@@ -24,9 +24,6 @@ stdenv.mkDerivation rec {
     "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON"
     "-DCMAKE_C_COMPILER_TARGET=${stdenv.hostPlatform.config}"
     "-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
-  ] ++ lib.optionals (stdenv.isDarwin) [
-    "-DDARWIN_macosx_OVERRIDE_SDK_VERSION=ON"
-    "-DDARWIN_osx_ARCHS=${stdenv.hostPlatform.parsed.cpu.name}"
   ] ++ lib.optionals (useLLVM || bareMetal || isMusl) [
     "-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
     "-DCOMPILER_RT_BUILD_XRAY=OFF"
@@ -44,15 +41,23 @@ stdenv.mkDerivation rec {
     "-DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY"
   ] ++ lib.optionals (bareMetal) [
     "-DCOMPILER_RT_OS_DIR=baremetal"
+  ] ++ lib.optionals (stdenv.hostPlatform.isDarwin) [
+    "-DDARWIN_macosx_OVERRIDE_SDK_VERSION=ON"
+    "-DDARWIN_osx_ARCHS=${stdenv.hostPlatform.darwinArch}"
+    "-DDARWIN_osx_BUILTIN_ARCHS=${stdenv.hostPlatform.darwinArch}"
   ];
 
   outputs = [ "out" "dev" ];
 
   patches = [
-    ./compiler-rt-codesign.patch # Revert compiler-rt commit that makes codesign mandatory
-    ./compiler-rt-X86-support-extension.patch # Add support for i486 i586 i686 by reusing i386 config
+    ./codesign.patch # Revert compiler-rt commit that makes codesign mandatory
+    ./X86-support-extension.patch # Add support for i486 i586 i686 by reusing i386 config
+    ./gnu-install-dirs.patch
+    # ld-wrapper dislikes `-rpath-link //nix/store`, so we normalize away the
+    # extra `/`.
+    ./normalize-var.patch
   ]# ++ lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
-    ++ lib.optional stdenv.hostPlatform.isAarch32 ./compiler-rt-armv7l.patch;
+    ++ lib.optional stdenv.hostPlatform.isAarch32 ./armv7l.patch;
 
 
   # TSAN requires XPC on Darwin, which we have no public/free source files for. We can depend on the Apple frameworks
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/compiler-rt/gnu-install-dirs.patch
new file mode 100644
index 00000000000..5f025764de1
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/gnu-install-dirs.patch
@@ -0,0 +1,129 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index b44ad2c2118e..d42f5664d448 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -8,6 +8,7 @@ cmake_minimum_required(VERSION 3.13.4)
+ # Check if compiler-rt is built as a standalone project.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR COMPILER_RT_STANDALONE_BUILD)
+   project(CompilerRT C CXX ASM)
++  include(GNUInstallDirs)
+   set(COMPILER_RT_STANDALONE_BUILD TRUE)
+   set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+ endif()
+diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake
+index 361538a58e47..f0d8d9ab80f1 100644
+--- a/cmake/Modules/AddCompilerRT.cmake
++++ b/cmake/Modules/AddCompilerRT.cmake
+@@ -495,7 +495,7 @@ macro(add_compiler_rt_resource_file target_name file_name component)
+   add_custom_target(${target_name} DEPENDS ${dst_file})
+   # Install in Clang resource directory.
+   install(FILES ${file_name}
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/share
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_DATADIR}
+     COMPONENT ${component})
+   add_dependencies(${component} ${target_name})
+ 
+@@ -512,7 +512,7 @@ macro(add_compiler_rt_script name)
+   add_custom_target(${name} DEPENDS ${dst})
+   install(FILES ${dst}
+     PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/bin)
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_BINDIR})
+ endmacro(add_compiler_rt_script src name)
+ 
+ # Builds custom version of libc++ and installs it in <prefix>.
+diff --git a/cmake/Modules/CompilerRTDarwinUtils.cmake b/cmake/Modules/CompilerRTDarwinUtils.cmake
+index 456a8dcda59f..7a09e74c7c79 100644
+--- a/cmake/Modules/CompilerRTDarwinUtils.cmake
++++ b/cmake/Modules/CompilerRTDarwinUtils.cmake
+@@ -508,7 +508,7 @@ macro(darwin_add_embedded_builtin_libraries)
+     set(DARWIN_macho_embedded_LIBRARY_OUTPUT_DIR
+       ${COMPILER_RT_OUTPUT_DIR}/lib/macho_embedded)
+     set(DARWIN_macho_embedded_LIBRARY_INSTALL_DIR
+-      ${COMPILER_RT_INSTALL_PATH}/lib/macho_embedded)
++      ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/macho_embedded)
+       
+     set(CFLAGS_armv7 "-target thumbv7-apple-darwin-eabi")
+     set(CFLAGS_i386 "-march=pentium")
+diff --git a/cmake/Modules/CompilerRTUtils.cmake b/cmake/Modules/CompilerRTUtils.cmake
+index f61d487e93a0..f1f46fb9599c 100644
+--- a/cmake/Modules/CompilerRTUtils.cmake
++++ b/cmake/Modules/CompilerRTUtils.cmake
+@@ -378,7 +378,7 @@ endfunction()
+ function(get_compiler_rt_install_dir arch install_dir)
+   if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+     get_compiler_rt_target(${arch} target)
+-    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/lib/${target} PARENT_SCOPE)
++    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${target} PARENT_SCOPE)
+   else()
+     set(${install_dir} ${COMPILER_RT_LIBRARY_INSTALL_DIR} PARENT_SCOPE)
+   endif()
+diff --git a/cmake/base-config-ix.cmake b/cmake/base-config-ix.cmake
+index 1edab43e7c0d..1aac6b73ff82 100644
+--- a/cmake/base-config-ix.cmake
++++ b/cmake/base-config-ix.cmake
+@@ -65,11 +65,11 @@ if (LLVM_TREE_AVAILABLE)
+ else()
+     # Take output dir and install path from the user.
+   set(COMPILER_RT_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH
+-    "Path where built compiler-rt libraries should be stored.")
++    "Path where built compiler-rt build artifacts should be stored.")
+   set(COMPILER_RT_EXEC_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/bin CACHE PATH
+     "Path where built compiler-rt executables should be stored.")
+-  set(COMPILER_RT_INSTALL_PATH ${CMAKE_INSTALL_PREFIX} CACHE PATH
+-    "Path where built compiler-rt libraries should be installed.")
++  set(COMPILER_RT_INSTALL_PATH "" CACHE PATH
++    "Prefix where built compiler-rt artifacts should be installed, comes before CMAKE_INSTALL_PREFIX.")
+   option(COMPILER_RT_INCLUDE_TESTS "Generate and build compiler-rt unit tests." OFF)
+   option(COMPILER_RT_ENABLE_WERROR "Fail and stop if warning is triggered" OFF)
+   # Use a host compiler to compile/link tests.
+@@ -97,7 +97,7 @@ else(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
+   set(COMPILER_RT_LIBRARY_OUTPUT_DIR
+     ${COMPILER_RT_OUTPUT_DIR}/lib/${COMPILER_RT_OS_DIR})
+   set(COMPILER_RT_LIBRARY_INSTALL_DIR
+-    ${COMPILER_RT_INSTALL_PATH}/lib/${COMPILER_RT_OS_DIR})
++    ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${COMPILER_RT_OS_DIR})
+ endif()
+ 
+ if(APPLE)
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index b00e8caa1ddd..0fe64e4862c9 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -69,22 +69,22 @@ set_target_properties(compiler-rt-headers PROPERTIES FOLDER "Compiler-RT Misc")
+ install(FILES ${SANITIZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/sanitizer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/sanitizer)
+ # Install fuzzer headers.
+ install(FILES ${FUZZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/fuzzer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/fuzzer)
+ # Install xray headers.
+ install(FILES ${XRAY_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/xray)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/xray)
+ # Install profile headers.
+ install(FILES ${PROFILE_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/profile)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/profile)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDEs.
+   add_custom_target(install-compiler-rt-headers
+diff --git a/lib/dfsan/CMakeLists.txt b/lib/dfsan/CMakeLists.txt
+index a29de8deff1b..d39ff01613d2 100644
+--- a/lib/dfsan/CMakeLists.txt
++++ b/lib/dfsan/CMakeLists.txt
+@@ -57,4 +57,4 @@ add_custom_command(OUTPUT ${dfsan_abilist_filename}
+                    DEPENDS done_abilist.txt libc_ubuntu1404_abilist.txt)
+ add_dependencies(dfsan dfsan_abilist)
+ install(FILES ${dfsan_abilist_filename}
+-        DESTINATION ${COMPILER_RT_INSTALL_PATH}/share)
++        DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_DATADIR})
diff --git a/pkgs/development/compilers/llvm/12/compiler-rt/normalize-var.patch b/pkgs/development/compilers/llvm/12/compiler-rt/normalize-var.patch
new file mode 100644
index 00000000000..135cf625ef7
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/compiler-rt/normalize-var.patch
@@ -0,0 +1,16 @@
+diff --git a/compiler-rt/cmake/Modules/CompilerRTUtils.cmake b/compiler-rt/cmake/Modules/CompilerRTUtils.cmake
+index f1f46fb9599c..6f19e69507ba 100644
+--- a/cmake/Modules/CompilerRTUtils.cmake
++++ b/cmake/Modules/CompilerRTUtils.cmake
+@@ -302,8 +302,9 @@ macro(load_llvm_config)
+     # Get some LLVM variables from LLVMConfig.
+     include("${LLVM_CMAKE_PATH}/LLVMConfig.cmake")
+ 
+-    set(LLVM_LIBRARY_OUTPUT_INTDIR
+-      ${LLVM_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
++    get_filename_component(LLVM_LIBRARY_OUTPUT_INTDIR
++      ${LLVM_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX}
++      REALPATH)
+   endif()
+ endmacro()
+ 
diff --git a/pkgs/development/compilers/llvm/12/default.nix b/pkgs/development/compilers/llvm/12/default.nix
index a6d68d2e2a4..ea054107e05 100644
--- a/pkgs/development/compilers/llvm/12/default.nix
+++ b/pkgs/development/compilers/llvm/12/default.nix
@@ -1,6 +1,5 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, gccForLibs
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
-, buildPackages
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 , darwin
@@ -27,34 +26,41 @@ let
   };
 
   tools = lib.makeExtensible (tools: let
-    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch; });
-    mkExtraBuildCommands = cc: ''
+    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch buildLlvmTools; });
+    mkExtraBuildCommands0 = cc: ''
       rsrc="$out/resource-root"
       mkdir "$rsrc"
-      ln -s "${cc}/lib/clang/${release_version}/include" "$rsrc"
+      ln -s "${cc.lib}/lib/clang/${release_version}/include" "$rsrc"
+      echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
+    '';
+    mkExtraBuildCommands = cc: mkExtraBuildCommands0 cc + ''
       ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
       ln -s "${targetLlvmLibraries.compiler-rt.out}/share" "$rsrc/share"
-      echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
     '';
 
   in {
 
-    llvm = callPackage ./llvm {
+    libllvm = callPackage ./llvm {
       inherit llvm_meta;
     };
 
-    clang-unwrapped = callPackage ./clang {
-      inherit (tools) lld;
+    # `llvm` historically had the binaries.  When choosing an output explicitly,
+    # we need to reintroduce `outputUnspecified` to get the expected behavior e.g. of lib.get*
+    llvm = tools.libllvm.out // { outputUnspecified = true; };
+
+    libclang = callPackage ./clang {
       inherit clang-tools-extra_src llvm_meta;
     };
 
+    clang-unwrapped = tools.libclang.out // { outputUnspecified = true; };
+
     # disabled until recommonmark supports sphinx 3
-    #Llvm-manpages = lowPrio (tools.llvm.override {
+    #Llvm-manpages = lowPrio (tools.libllvm.override {
     #  enableManpages = true;
     #  python3 = pkgs.python3;  # don't use python-boot
     #});
 
-    clang-manpages = lowPrio (tools.clang-unwrapped.override {
+    clang-manpages = lowPrio (tools.libclang.override {
       enableManpages = true;
       python3 = pkgs.python3;  # don't use python-boot
     });
@@ -65,8 +71,6 @@ let
     #   python3 = pkgs.python3;  # don't use python-boot
     # });
 
-    libclang = tools.clang-unwrapped.lib;
-
     clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
 
     libstdcxxClang = wrapCCWith rec {
@@ -164,7 +168,7 @@ let
       '' + mkExtraBuildCommands cc;
     };
 
-    lldClangNoCompilerRt = wrapCCWith {
+    lldClangNoCompilerRt = wrapCCWith rec {
       cc = tools.clang-unwrapped;
       libcxx = null;
       bintools = wrapBintoolsWith {
@@ -174,7 +178,7 @@ let
       extraPackages = [ ];
       extraBuildCommands = ''
         echo "-nostartfiles" >> $out/nix-support/cc-cflags
-      '';
+      '' + mkExtraBuildCommands0 cc;
     };
 
   });
diff --git a/pkgs/development/compilers/llvm/12/libcxxabi/default.nix b/pkgs/development/compilers/llvm/12/libcxxabi/default.nix
index dab6c583e88..7c974262438 100644
--- a/pkgs/development/compilers/llvm/12/libcxxabi/default.nix
+++ b/pkgs/development/compilers/llvm/12/libcxxabi/default.nix
@@ -31,7 +31,7 @@ stdenv.mkDerivation {
   '' + lib.optionalString stdenv.hostPlatform.isMusl ''
     patch -p1 -d libcxx -i ${../../libcxx-0001-musl-hacks.patch}
   '' + lib.optionalString stdenv.hostPlatform.isWasm ''
-    patch -p1 -d llvm -i ${./libcxxabi-wasm.patch}
+    patch -p1 -d llvm -i ${./wasm.patch}
   '';
 
   installPhase = if stdenv.isDarwin
diff --git a/pkgs/development/compilers/llvm/12/libcxxabi/libcxxabi-wasm.patch b/pkgs/development/compilers/llvm/12/libcxxabi/wasm.patch
index 4ebfe46aa81..4ebfe46aa81 100644
--- a/pkgs/development/compilers/llvm/12/libcxxabi/libcxxabi-wasm.patch
+++ b/pkgs/development/compilers/llvm/12/libcxxabi/wasm.patch
diff --git a/pkgs/development/compilers/llvm/12/libunwind/default.nix b/pkgs/development/compilers/llvm/12/libunwind/default.nix
index 8b75146d7b2..abfe950614a 100644
--- a/pkgs/development/compilers/llvm/12/libunwind/default.nix
+++ b/pkgs/development/compilers/llvm/12/libunwind/default.nix
@@ -15,6 +15,12 @@ stdenv.mkDerivation rec {
     mv llvm-* llvm
   '';
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
+  outputs = [ "out" "dev" ];
+
   nativeBuildInputs = [ cmake ];
 
   cmakeFlags = lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF";
diff --git a/pkgs/development/compilers/llvm/12/libunwind/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/libunwind/gnu-install-dirs.patch
new file mode 100644
index 00000000000..a791d6c4323
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/libunwind/gnu-install-dirs.patch
@@ -0,0 +1,34 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 48cb8e004e08..fec8144fb95a 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -23,6 +23,8 @@ set(LIBUNWIND_LIBCXX_PATH "${CMAKE_CURRENT_LIST_DIR}/../libcxx" CACHE PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBUNWIND_STANDALONE_BUILD)
+   project(libunwind LANGUAGES C CXX ASM)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libunwind)
+   set(PACKAGE_VERSION 12.0.0)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+@@ -115,17 +117,17 @@ set(CMAKE_MODULE_PATH
+ 
+ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBUNWIND_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+     string(APPEND LIBUNWIND_INSTALL_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+   endif()
+ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX})
+ else()
+   set(LIBUNWIND_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBUNWIND_LIBDIR_SUFFIX})
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX})
+ endif()
+ 
+ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBUNWIND_LIBRARY_DIR})
diff --git a/pkgs/development/compilers/llvm/12/lld/default.nix b/pkgs/development/compilers/llvm/12/lld/default.nix
index 18b72a90407..d46f25b68b3 100644
--- a/pkgs/development/compilers/llvm/12/lld/default.nix
+++ b/pkgs/development/compilers/llvm/12/lld/default.nix
@@ -1,9 +1,10 @@
 { lib, stdenv, llvm_meta
+, buildLlvmTools
 , fetch
 , libunwind
 , cmake
 , libxml2
-, llvm
+, libllvm
 , version
 }:
 
@@ -13,8 +14,20 @@ stdenv.mkDerivation rec {
 
   src = fetch pname "1zakyxk5bwnh7jarckcd4rbmzi58jgn2dbah5j5cwcyfyfbx9drc";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ llvm libxml2 ];
+  buildInputs = [ libllvm libxml2 ];
+
+  cmakeFlags = [
+    "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
+  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+  ];
+
+  outputs = [ "out" "lib" "dev" ];
 
   postPatch = ''
     substituteInPlace MachO/CMakeLists.txt --replace \
@@ -23,13 +36,6 @@ stdenv.mkDerivation rec {
     tar -xf "${libunwind.src}" --wildcards -C libunwind/include --strip-components=2 "libunwind-*/include/"
   '';
 
-  outputs = [ "out" "dev" ];
-
-  postInstall = ''
-    moveToOutput include "$dev"
-    moveToOutput lib "$dev"
-  '';
-
   meta = llvm_meta // {
     homepage = "https://lld.llvm.org/";
     description = "The LLVM linker";
diff --git a/pkgs/development/compilers/llvm/12/lld/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/lld/gnu-install-dirs.patch
new file mode 100644
index 00000000000..61e2f0e4865
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/lld/gnu-install-dirs.patch
@@ -0,0 +1,68 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index d4e561b50d8f..cfa5bdd79c2a 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -6,6 +6,8 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   set(CMAKE_INCLUDE_CURRENT_DIR ON)
+   set(LLD_BUILT_STANDALONE TRUE)
+ 
++  include(GNUInstallDirs)
++
+   find_program(LLVM_CONFIG_PATH "llvm-config" DOC "Path to llvm-config binary")
+   if(NOT LLVM_CONFIG_PATH)
+     message(FATAL_ERROR "llvm-config not found: specify LLVM_CONFIG_PATH")
+@@ -179,7 +181,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     )
+diff --git a/cmake/modules/AddLLD.cmake b/cmake/modules/AddLLD.cmake
+index 23df41312403..d62372c88de7 100644
+--- a/cmake/modules/AddLLD.cmake
++++ b/cmake/modules/AddLLD.cmake
+@@ -20,9 +20,9 @@ macro(add_lld_library name)
+     install(TARGETS ${name}
+       COMPONENT ${name}
+       ${export_to_lldtargets}
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      RUNTIME DESTINATION bin)
++      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+     if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+       add_llvm_install_targets(install-${name}
+@@ -54,7 +54,7 @@ macro(add_lld_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_lldtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -69,5 +69,5 @@ endmacro()
+ macro(add_lld_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/tools/lld/CMakeLists.txt b/tools/lld/CMakeLists.txt
+index 5cff736ff57f..64e775c771b9 100644
+--- a/tools/lld/CMakeLists.txt
++++ b/tools/lld/CMakeLists.txt
+@@ -21,7 +21,7 @@ target_link_libraries(lld
+   )
+ 
+ install(TARGETS lld
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ if(NOT LLD_SYMLINKS_TO_CREATE)
+   set(LLD_SYMLINKS_TO_CREATE
diff --git a/pkgs/development/compilers/llvm/12/lldb/default.nix b/pkgs/development/compilers/llvm/12/lldb/default.nix
index 1fce82d7990..07517308b46 100644
--- a/pkgs/development/compilers/llvm/12/lldb/default.nix
+++ b/pkgs/development/compilers/llvm/12/lldb/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv, llvm_meta
+, runCommand
 , fetch
 , cmake
 , zlib
@@ -7,8 +8,8 @@
 , which
 , libedit
 , libxml2
-, llvm
-, clang-unwrapped
+, libllvm
+, libclang
 , python3
 , version
 , libobjc
@@ -27,17 +28,30 @@ stdenv.mkDerivation (rec {
 
   src = fetch pname "1v85qyq3snk81vjmwq5q7xikyyqsfpqy2c4qmr81mps4avsw1g0l";
 
-  patches = [ ./lldb-procfs.patch ];
+  patches = [
+    ./procfs.patch
+    (runCommand "resource-dir.patch" {
+      clangLibDir = "${libclang.lib}/lib";
+    } ''
+      substitute '${./resource-dir.patch}' "$out" --subst-var clangLibDir
+    '')
+    ./gnu-install-dirs.patch
+  ];
+
+  outputs = [ "out" "lib" "dev" ];
 
-  nativeBuildInputs = [ cmake python3 which swig lit ]
-    ++ lib.optionals enableManpages [ python3.pkgs.sphinx python3.pkgs.recommonmark ];
+  nativeBuildInputs = [
+    cmake python3 which swig lit
+  ] ++ lib.optionals enableManpages [
+    python3.pkgs.sphinx python3.pkgs.recommonmark
+  ];
 
   buildInputs = [
     ncurses
     zlib
     libedit
     libxml2
-    llvm
+    libllvm
   ]
   ++ lib.optionals stdenv.isDarwin [
     libobjc
@@ -51,8 +65,9 @@ stdenv.mkDerivation (rec {
   hardeningDisable = [ "format" ];
 
   cmakeFlags = [
+    "-DLLDB_INCLUDE_TESTS=${if doCheck then "YES" else "NO"}"
     "-DLLVM_ENABLE_RTTI=OFF"
-    "-DClang_DIR=${clang-unwrapped}/lib/cmake"
+    "-DClang_DIR=${libclang.dev}/lib/cmake"
     "-DLLVM_EXTERNAL_LIT=${lit}/bin/lit"
   ] ++ lib.optionals stdenv.isDarwin [
     "-DLLDB_USE_SYSTEM_DEBUGSERVER=ON"
@@ -62,8 +77,13 @@ stdenv.mkDerivation (rec {
     "-DLLVM_ENABLE_SPHINX=ON"
     "-DSPHINX_OUTPUT_MAN=ON"
     "-DSPHINX_OUTPUT_HTML=OFF"
+  ] ++ lib.optionals doCheck [
+    "-DLLDB_TEST_C_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
+    "-DLLDB_TEST_CXX_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++"
   ];
 
+  doCheck = false;
+
   postInstall = ''
     # Editor support
     # vscode:
@@ -90,6 +110,7 @@ stdenv.mkDerivation (rec {
   '';
 
   propagatedBuildInputs = [];
+
   # manually install lldb man page
   installPhase = ''
     mkdir -p $out/share/man/man1
diff --git a/pkgs/development/compilers/llvm/12/lldb/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/lldb/gnu-install-dirs.patch
new file mode 100644
index 00000000000..98321f4479e
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/lldb/gnu-install-dirs.patch
@@ -0,0 +1,65 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index b5633e21c56a..f2f1035e9238 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -10,6 +10,8 @@ set(CMAKE_MODULE_PATH
+ # If we are not building as part of LLVM, build LLDB as a standalone project,
+ # using LLVM as an external library.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
++  include(GNUInstallDirs)
++
+   project(lldb)
+   include(LLDBStandalone)
+ 
+diff --git a/cmake/modules/AddLLDB.cmake b/cmake/modules/AddLLDB.cmake
+index 4ed5c647c5d2..89f96e710d55 100644
+--- a/cmake/modules/AddLLDB.cmake
++++ b/cmake/modules/AddLLDB.cmake
+@@ -107,13 +107,13 @@ function(add_lldb_library name)
+   endif()
+ 
+   if(PARAM_SHARED)
+-    set(install_dest lib${LLVM_LIBDIR_SUFFIX})
++    set(install_dest ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+     if(PARAM_INSTALL_PREFIX)
+       set(install_dest ${PARAM_INSTALL_PREFIX})
+     endif()
+     # RUNTIME is relevant for DLL platforms, FRAMEWORK for macOS
+     install(TARGETS ${name} COMPONENT ${name}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       LIBRARY DESTINATION ${install_dest}
+       ARCHIVE DESTINATION ${install_dest}
+       FRAMEWORK DESTINATION ${install_dest})
+diff --git a/cmake/modules/LLDBConfig.cmake b/cmake/modules/LLDBConfig.cmake
+index 2fdf1502d055..37364341ff8b 100644
+--- a/cmake/modules/LLDBConfig.cmake
++++ b/cmake/modules/LLDBConfig.cmake
+@@ -225,7 +225,7 @@ include_directories(BEFORE
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".cmake" EXCLUDE
+@@ -233,7 +233,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".cmake" EXCLUDE
+diff --git a/tools/intel-features/CMakeLists.txt b/tools/intel-features/CMakeLists.txt
+index 734167e51bc5..f95761b5df58 100644
+--- a/tools/intel-features/CMakeLists.txt
++++ b/tools/intel-features/CMakeLists.txt
+@@ -65,4 +65,4 @@ if (LLDB_ENABLE_PYTHON AND LLDB_BUILD_INTEL_PT)
+ endif()
+ 
+ install(TARGETS lldbIntelFeatures
+-  LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
diff --git a/pkgs/development/compilers/llvm/12/lldb/lldb-procfs.patch b/pkgs/development/compilers/llvm/12/lldb/procfs.patch
index b075dbaeee0..b075dbaeee0 100644
--- a/pkgs/development/compilers/llvm/12/lldb/lldb-procfs.patch
+++ b/pkgs/development/compilers/llvm/12/lldb/procfs.patch
diff --git a/pkgs/development/compilers/llvm/12/lldb/resource-dir.patch b/pkgs/development/compilers/llvm/12/lldb/resource-dir.patch
new file mode 100644
index 00000000000..e0db80afeb9
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/lldb/resource-dir.patch
@@ -0,0 +1,13 @@
+diff --git a/lldb/cmake/modules/LLDBConfig.cmake b/lldb/cmake/modules/LLDBConfig.cmake
+index 37364341ff8b..7f74c1a3e257 100644
+--- a/cmake/modules/LLDBConfig.cmake
++++ b/cmake/modules/LLDBConfig.cmake
+@@ -257,7 +257,7 @@ if (NOT TARGET clang-resource-headers)
+   # Iterate over the possible places where the external resource directory
+   # could be and pick the first that exists.
+   foreach(CANDIDATE "${Clang_DIR}/../.." "${LLVM_DIR}" "${LLVM_LIBRARY_DIRS}"
+-                    "${LLVM_BUILD_LIBRARY_DIR}"
++                    "${LLVM_BUILD_LIBRARY_DIR}" "@clangLibDir@"
+                     "${LLVM_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX}")
+     # Build the resource directory path by appending 'clang/<version number>'.
+     set(CANDIDATE_RESOURCE_DIR "${CANDIDATE}/clang/${LLDB_CLANG_RESOURCE_DIR_NAME}")
diff --git a/pkgs/development/compilers/llvm/12/llvm/default.nix b/pkgs/development/compilers/llvm/12/llvm/default.nix
index 33bb7b931f1..0bc704a8155 100644
--- a/pkgs/development/compilers/llvm/12/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/12/llvm/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv, llvm_meta
+, pkgsBuildBuild
 , fetch
 , cmake
 , python3
@@ -10,10 +11,10 @@
 , version
 , release_version
 , zlib
-, buildPackages
+, buildLlvmTools
 , debugVersion ? false
 , enableManpages ? false
-, enableSharedLibraries ? true
+, enableSharedLibraries ? !stdenv.hostPlatform.isStatic
 , enablePFM ? !(stdenv.isDarwin
   || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
   || stdenv.isAarch32 # broken for the armv7l builder
@@ -44,8 +45,7 @@ in stdenv.mkDerivation (rec {
     mv polly-* $sourceRoot/tools/polly
   '';
 
-  outputs = [ "out" "python" ]
-    ++ optional enableSharedLibraries "lib";
+  outputs = [ "out" "lib" "dev" "python" ];
 
   nativeBuildInputs = [ cmake python3 ]
     ++ optionals enableManpages [ python3.pkgs.sphinx python3.pkgs.recommonmark ];
@@ -59,17 +59,18 @@ in stdenv.mkDerivation (rec {
     # Force a test to evaluate the saved benchmark for a CPU for which LLVM has
     # an execution model. See NixOS/nixpkgs#119673.
     ../../exegesis-force-bdver2.patch
-  ];
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
 
   postPatch = optionalString stdenv.isDarwin ''
     substituteInPlace cmake/modules/AddLLVM.cmake \
       --replace 'set(_install_name_dir INSTALL_NAME_DIR "@rpath")' "set(_install_name_dir)" \
-      --replace 'set(_install_rpath "@loader_path/../lib''${LLVM_LIBDIR_SUFFIX}" ''${extra_libdir})' ""
+      --replace 'set(_install_rpath "@loader_path/../''${CMAKE_INSTALL_LIBDIR}''${LLVM_LIBDIR_SUFFIX}" ''${extra_libdir})' ""
   ''
   # Patch llvm-config to return correct library path based on --link-{shared,static}.
   + optionalString (enableSharedLibraries) ''
-    substitute '${./llvm-outputs.patch}' ./llvm-outputs.patch --subst-var lib
-    patch -p1 < ./llvm-outputs.patch
+    substitute '${./outputs.patch}' ./outputs.patch --subst-var lib
+    patch -p1 < ./outputs.patch
   '' + ''
     # FileSystem permissions tests fail with various special bits
     substituteInPlace unittests/Support/CMakeLists.txt \
@@ -108,6 +109,7 @@ in stdenv.mkDerivation (rec {
   LDFLAGS = optionalString (enableSharedLibraries && !stdenv.isDarwin) "-Wl,--build-id=sha1";
 
   cmakeFlags = with stdenv; [
+    "-DLLVM_INSTALL_CMAKE_DIR=${placeholder "dev"}/lib/cmake/llvm/"
     "-DCMAKE_BUILD_TYPE=${if debugVersion then "Debug" else "Release"}"
     "-DLLVM_INSTALL_UTILS=ON"  # Needed by rustc
     "-DLLVM_BUILD_TESTS=ON"
@@ -131,11 +133,24 @@ in stdenv.mkDerivation (rec {
     "-DCAN_TARGET_i386=false"
   ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
     "-DCMAKE_CROSSCOMPILING=True"
-    "-DLLVM_TABLEGEN=${buildPackages.llvm_12}/bin/llvm-tblgen"
+    "-DLLVM_TABLEGEN=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+    (
+      let
+        nativeCC = pkgsBuildBuild.targetPackages.stdenv.cc;
+        nativeBintools = nativeCC.bintools.bintools;
+        nativeToolchainFlags = [
+          "-DCMAKE_C_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}cc"
+          "-DCMAKE_CXX_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}c++"
+          "-DCMAKE_AR=${nativeBintools}/bin/${nativeBintools.targetPrefix}ar"
+          "-DCMAKE_STRIP=${nativeBintools}/bin/${nativeBintools.targetPrefix}strip"
+          "-DCMAKE_RANLIB=${nativeBintools}/bin/${nativeBintools.targetPrefix}ranlib"
+        ];
+      in "-DCROSS_TOOLCHAIN_FLAGS_NATIVE:list=${lib.concatStringsSep ";" nativeToolchainFlags}"
+    )
   ];
 
   postBuild = ''
-    rm -R $out
+    rm -fR $out
   '';
 
   preCheck = ''
@@ -145,20 +160,19 @@ in stdenv.mkDerivation (rec {
   postInstall = ''
     mkdir -p $python/share
     mv $out/share/opt-viewer $python/share/opt-viewer
-  ''
-  + optionalString enableSharedLibraries ''
-    moveToOutput "lib/libLLVM-*" "$lib"
-    moveToOutput "lib/libLLVM${stdenv.hostPlatform.extensions.sharedLibrary}" "$lib"
-  ''
-  + optionalString (enableSharedLibraries && (!stdenv.isDarwin)) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM-" "$lib/lib/libLLVM-"
+    moveToOutput "bin/llvm-config*" "$dev"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
+      --replace "\''${_IMPORT_PREFIX}/lib/lib" "$lib/lib/lib" \
+      --replace "$out/bin/llvm-config" "$dev/bin/llvm-config"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMConfig.cmake" \
+      --replace 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}")' 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}'"$lib"'")'
   ''
   + optionalString (stdenv.isDarwin && enableSharedLibraries) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM.dylib" "$lib/lib/libLLVM.dylib"
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${shortVersion}.dylib
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${release_version}.dylib
+  ''
+  + optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    cp NATIVE/bin/llvm-config $dev/bin/llvm-config-native
   '';
 
   doCheck = stdenv.isLinux && (!stdenv.isx86_32) && (!stdenv.hostPlatform.isMusl);
diff --git a/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs-polly.patch b/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs-polly.patch
new file mode 100644
index 00000000000..68f3c45396f
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs-polly.patch
@@ -0,0 +1,105 @@
+diff --git a/tools/polly/CMakeLists.txt b/tools/polly/CMakeLists.txt
+index ca7c04c565bb..6ed5db5dd4f8 100644
+--- a/tools/polly/CMakeLists.txt
++++ b/tools/polly/CMakeLists.txt
+@@ -2,7 +2,11 @@
+ if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   project(Polly)
+   cmake_minimum_required(VERSION 3.13.4)
++endif()
++
++include(GNUInstallDirs)
+ 
++if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   # Where is LLVM installed?
+   find_package(LLVM CONFIG REQUIRED)
+   set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+@@ -122,13 +126,13 @@ include_directories(
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     )
+ 
+   install(DIRECTORY ${POLLY_BINARY_DIR}/include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN "CMakeFiles" EXCLUDE
+diff --git a/tools/polly/cmake/CMakeLists.txt b/tools/polly/cmake/CMakeLists.txt
+index 7cc129ba2e90..137be25e4b80 100644
+--- a/tools/polly/cmake/CMakeLists.txt
++++ b/tools/polly/cmake/CMakeLists.txt
+@@ -79,18 +79,18 @@ file(GENERATE
+ 
+ # Generate PollyConfig.cmake for the install tree.
+ unset(POLLY_EXPORTS)
+-set(POLLY_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
++set(POLLY_INSTALL_PREFIX "")
+ set(POLLY_CONFIG_LLVM_CMAKE_DIR "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}")
++set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
++set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+ if (POLLY_BUNDLED_ISL)
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
+-    "${POLLY_INSTALL_PREFIX}/include/polly"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}/polly"
+     )
+ else()
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+     ${ISL_INCLUDE_DIRS}
+     )
+ endif()
+@@ -100,12 +100,12 @@ endif()
+ foreach(tgt IN LISTS POLLY_CONFIG_EXPORTED_TARGETS)
+   get_target_property(tgt_type ${tgt} TYPE)
+   if (tgt_type STREQUAL "EXECUTABLE")
+-    set(tgt_prefix "bin/")
++    set(tgt_prefix "${CMAKE_INSTALL_BINDIR}/")
+   else()
+-    set(tgt_prefix "lib/")
++    set(tgt_prefix "${CMAKE_INSTALL_LIBDIR}/")
+   endif()
+ 
+-  set(tgt_path "${CMAKE_INSTALL_PREFIX}/${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
++  set(tgt_path "${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
+   file(RELATIVE_PATH tgt_path ${POLLY_CONFIG_CMAKE_DIR} ${tgt_path})
+ 
+   if (NOT tgt_type STREQUAL "INTERFACE_LIBRARY")
+diff --git a/tools/polly/cmake/polly_macros.cmake b/tools/polly/cmake/polly_macros.cmake
+index 518a09b45a42..bd9d6f5542ad 100644
+--- a/tools/polly/cmake/polly_macros.cmake
++++ b/tools/polly/cmake/polly_macros.cmake
+@@ -44,8 +44,8 @@ macro(add_polly_library name)
+   if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LLVMPolly")
+     install(TARGETS ${name}
+       EXPORT LLVMExports
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++	  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   endif()
+   set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+ endmacro(add_polly_library)
+diff --git a/tools/polly/lib/External/CMakeLists.txt b/tools/polly/lib/External/CMakeLists.txt
+index 8991094d92c7..178d8ad606bb 100644
+--- a/tools/polly/lib/External/CMakeLists.txt
++++ b/tools/polly/lib/External/CMakeLists.txt
+@@ -275,7 +275,7 @@ if (POLLY_BUNDLED_ISL)
+     install(DIRECTORY
+       ${ISL_SOURCE_DIR}/include/
+       ${ISL_BINARY_DIR}/include/
+-      DESTINATION include/polly
++      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/polly
+       FILES_MATCHING
+       PATTERN "*.h"
+       PATTERN "CMakeFiles" EXCLUDE
diff --git a/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs.patch
new file mode 100644
index 00000000000..da8dc144517
--- /dev/null
+++ b/pkgs/development/compilers/llvm/12/llvm/gnu-install-dirs.patch
@@ -0,0 +1,417 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 277d0fe54d7b..af69c8be8745 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -256,15 +256,21 @@ if (CMAKE_BUILD_TYPE AND
+   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+ endif()
+ 
++include(GNUInstallDirs)
++
+ set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
+ 
+-set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
++set(LLVM_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE STRING
++    "Path for binary subdirectory (defaults to 'bin')")
+ mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+ 
+ set(LLVM_UTILS_INSTALL_DIR "${LLVM_TOOLS_INSTALL_DIR}" CACHE STRING
+     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
+ mark_as_advanced(LLVM_UTILS_INSTALL_DIR)
+ 
++set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
++	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
++
+ # They are used as destination of target generators.
+ set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
+ set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
+@@ -567,9 +573,9 @@ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
+ option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
+ option (LLVM_ENABLE_BINDINGS "Build bindings." ON)
+ 
+-set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
++set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html"
+     CACHE STRING "Doxygen-generated HTML documentation install directory")
+-set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
++set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html"
+     CACHE STRING "OCamldoc-generated HTML documentation install directory")
+ 
+ option (LLVM_BUILD_EXTERNAL_COMPILER_RT
+@@ -1027,7 +1033,7 @@ endif()
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/llvm include/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -1038,7 +1044,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm ${LLVM_INCLUDE_DIR}/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -1052,13 +1058,13 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   if (LLVM_INSTALL_MODULEMAPS)
+     install(DIRECTORY include/llvm include/llvm-c
+-            DESTINATION include
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+             COMPONENT llvm-headers
+             FILES_MATCHING
+             PATTERN "module.modulemap"
+             )
+     install(FILES include/llvm/module.install.modulemap
+-            DESTINATION include/llvm
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm
+             COMPONENT llvm-headers
+             RENAME "module.extern.modulemap"
+             )
+diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
+index 97c9980c7de3..409e8b615f75 100644
+--- a/cmake/modules/AddLLVM.cmake
++++ b/cmake/modules/AddLLVM.cmake
+@@ -804,9 +804,9 @@ macro(add_llvm_library name)
+ 
+       install(TARGETS ${name}
+               ${export_to_llvmexports}
+-              LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+-              ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+-              RUNTIME DESTINATION bin COMPONENT ${name})
++              LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
++              ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
++              RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ${name})
+ 
+       if (NOT LLVM_ENABLE_IDE)
+         add_llvm_install_targets(install-${name}
+@@ -1022,7 +1022,7 @@ function(process_llvm_pass_plugins)
+           "set(LLVM_STATIC_EXTENSIONS ${LLVM_STATIC_EXTENSIONS})")
+       install(FILES
+           ${llvm_cmake_builddir}/LLVMConfigExtensions.cmake
+-          DESTINATION ${LLVM_INSTALL_PACKAGE_DIR}
++          DESTINATION ${LLVM_INSTALL_CMAKE_DIR}
+           COMPONENT cmake-exports)
+ 
+       set(ExtensionDef "${LLVM_BINARY_DIR}/include/llvm/Support/Extension.def")
+@@ -1242,7 +1242,7 @@ macro(add_llvm_example name)
+   endif()
+   add_llvm_executable(${name} ${ARGN})
+   if( LLVM_BUILD_EXAMPLES )
+-    install(TARGETS ${name} RUNTIME DESTINATION examples)
++    install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   endif()
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endmacro(add_llvm_example name)
+@@ -1854,7 +1854,7 @@ function(llvm_install_library_symlink name dest type)
+   set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
+   set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
+ 
+-  set(output_dir lib${LLVM_LIBDIR_SUFFIX})
++  set(output_dir ${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   if(WIN32 AND "${type}" STREQUAL "SHARED")
+     set(output_dir bin)
+   endif()
+@@ -1871,7 +1871,7 @@ function(llvm_install_library_symlink name dest type)
+   endif()
+ endfunction()
+ 
+-function(llvm_install_symlink name dest)
++function(llvm_install_symlink name dest output_dir)
+   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
+   foreach(path ${CMAKE_MODULE_PATH})
+     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
+@@ -1894,7 +1894,7 @@ function(llvm_install_symlink name dest)
+   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
+ 
+   install(SCRIPT ${INSTALL_SYMLINK}
+-          CODE "install_symlink(${full_name} ${full_dest} ${LLVM_TOOLS_INSTALL_DIR})"
++          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+           COMPONENT ${component})
+ 
+   if (NOT LLVM_ENABLE_IDE AND NOT ARG_ALWAYS_GENERATE)
+@@ -1977,7 +1977,8 @@ function(add_llvm_tool_symlink link_name target)
+     endif()
+ 
+     if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
+-      llvm_install_symlink(${link_name} ${target})
++      GNUInstallDirs_get_absolute_install_dir(output_dir LLVM_TOOLS_INSTALL_DIR)
++      llvm_install_symlink(${link_name} ${target} ${output_dir})
+     endif()
+   endif()
+ endfunction()
+@@ -2100,9 +2101,9 @@ function(llvm_setup_rpath name)
+ 
+   if (APPLE)
+     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
+-    set(_install_rpath "@loader_path/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "@loader_path/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+   elseif(UNIX)
+-    set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
+       set_property(TARGET ${name} APPEND_STRING PROPERTY
+                    LINK_FLAGS " -Wl,-z,origin ")
+diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
+index 554046b20edf..4d1ad980641e 100644
+--- a/cmake/modules/AddOCaml.cmake
++++ b/cmake/modules/AddOCaml.cmake
+@@ -144,9 +144,9 @@ function(add_ocaml_library name)
+   endforeach()
+ 
+   if( APPLE )
+-    set(ocaml_rpath "@executable_path/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "@executable_path/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   elseif( UNIX )
+-    set(ocaml_rpath "\\$ORIGIN/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "\\$ORIGIN/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   endif()
+   list(APPEND ocaml_flags "-ldopt" "-Wl,-rpath,${ocaml_rpath}")
+ 
+diff --git a/cmake/modules/AddSphinxTarget.cmake b/cmake/modules/AddSphinxTarget.cmake
+index e80c3b5c1cac..482f6d715ef5 100644
+--- a/cmake/modules/AddSphinxTarget.cmake
++++ b/cmake/modules/AddSphinxTarget.cmake
+@@ -90,7 +90,7 @@ function (add_sphinx_target builder project)
+         endif()
+       elseif (builder STREQUAL html)
+         string(TOUPPER "${project}" project_upper)
+-        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
++        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/html"
+             CACHE STRING "HTML documentation install directory for ${project}")
+ 
+         # '/.' indicates: copy the contents of the directory directly into
+diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
+index 505dc9a29d70..36e6c63af3f4 100644
+--- a/cmake/modules/CMakeLists.txt
++++ b/cmake/modules/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
++set(LLVM_INSTALL_PACKAGE_DIR ${LLVM_INSTALL_CMAKE_DIR} CACHE STRING "Path for CMake subdirectory (defaults to 'cmake/llvm')")
+ set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+ 
+ # First for users who use an installed LLVM, create the LLVMExports.cmake file.
+@@ -107,13 +107,13 @@ foreach(p ${_count})
+   set(LLVM_CONFIG_CODE "${LLVM_CONFIG_CODE}
+ get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
+ endforeach(p)
+-set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
++set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
+ set(LLVM_CONFIG_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
+ set(LLVM_CONFIG_MAIN_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
+-set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
++set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
+ set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
+ set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
+-set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/bin")
++set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}")
+ 
+ # Generate a default location for lit
+ if (LLVM_INSTALL_UTILS AND LLVM_BUILD_UTILS)
+diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
+index 09fed8085c23..aa79f192abf0 100644
+--- a/cmake/modules/LLVMInstallSymlink.cmake
++++ b/cmake/modules/LLVMInstallSymlink.cmake
+@@ -10,7 +10,7 @@ function(install_symlink name target outdir)
+     set(LINK_OR_COPY copy)
+   endif()
+ 
+-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
++  set(bindir "${DESTDIR}${outdir}/")
+ 
+   message(STATUS "Creating ${name}")
+ 
+diff --git a/docs/CMake.rst b/docs/CMake.rst
+index bb821b417ad9..6a528f7c2ad3 100644
+--- a/docs/CMake.rst
++++ b/docs/CMake.rst
+@@ -196,7 +196,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
+ **LLVM_LIBDIR_SUFFIX**:STRING
+   Extra suffix to append to the directory where libraries are to be
+   installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
+-  to install libraries to ``/usr/lib64``.
++  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
+ 
+ **CMAKE_C_FLAGS**:STRING
+   Extra flags to use when compiling C source files.
+@@ -550,8 +550,8 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
+   The path to install Doxygen-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/doxygen-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
+ 
+ **LLVM_ENABLE_SPHINX**:BOOL
+   If specified, CMake will search for the ``sphinx-build`` executable and will make
+@@ -582,13 +582,33 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_SPHINX_HTML_DIR**:STRING
+   The path to install Sphinx-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/html`.
+ 
+ **LLVM_INSTALL_OCAMLDOC_HTML_DIR**:STRING
+   The path to install OCamldoc-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/ocaml-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html`.
++
++**CMAKE_INSTALL_BINDIR**:STRING
++  The path to install binary tools, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `bin`.
++
++**CMAKE_INSTALL_LIBDIR**:STRING
++  The path to install libraries, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `lib`.
++
++**CMAKE_INSTALL_INCLUDEDIR**:STRING
++  The path to install header files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `include`.
++
++**CMAKE_INSTALL_DOCDIR**:STRING
++  The path to install documentation, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/doc`.
++
++**CMAKE_INSTALL_MANDIR**:STRING
++  The path to install manpage files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/man`.
+ 
+ **LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
+   macOS Only: If enabled CMake will generate a target named
+@@ -786,9 +806,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
+ 
+ This file is available in two different locations.
+ 
+-* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
+-  ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
+-  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
++* ``<LLVM_INSTALL_PACKAGE_DIR>LLVMConfig.cmake`` where
++  ``<LLVM_INSTALL_PACKAGE_DIR>`` is the location where LLVM CMake modules are
++  installed as part of an installed version of LLVM. This is typically
++  ``cmake/llvm/`` within the lib directory. On Linux, this is typically
++  ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
+ 
+ * ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
+   ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
+diff --git a/examples/Bye/CMakeLists.txt b/examples/Bye/CMakeLists.txt
+index bb96edb4b4bf..678c22fb43c8 100644
+--- a/examples/Bye/CMakeLists.txt
++++ b/examples/Bye/CMakeLists.txt
+@@ -14,6 +14,6 @@ if (NOT WIN32)
+     BUILDTREE_ONLY
+    )
+ 
+-  install(TARGETS ${name} RUNTIME DESTINATION examples)
++  install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endif()
+diff --git a/include/llvm/CMakeLists.txt b/include/llvm/CMakeLists.txt
+index b46319f24fc8..2feabd1954e4 100644
+--- a/include/llvm/CMakeLists.txt
++++ b/include/llvm/CMakeLists.txt
+@@ -5,5 +5,5 @@ add_subdirectory(Frontend)
+ # If we're doing an out-of-tree build, copy a module map for generated
+ # header files into the build area.
+ if (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+-  configure_file(module.modulemap.build module.modulemap COPYONLY)
++  configure_file(module.modulemap.build ${LLVM_INCLUDE_DIR}/module.modulemap COPYONLY)
+ endif (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
+index ebe5b73a5c65..70c497be12f5 100644
+--- a/tools/llvm-config/BuildVariables.inc.in
++++ b/tools/llvm-config/BuildVariables.inc.in
+@@ -23,6 +23,10 @@
+ #define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
+ #define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
+ #define LLVM_LIBDIR_SUFFIX "@LLVM_LIBDIR_SUFFIX@"
++#define LLVM_INSTALL_BINDIR "@CMAKE_INSTALL_BINDIR@"
++#define LLVM_INSTALL_LIBDIR "@CMAKE_INSTALL_LIBDIR@"
++#define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
++#define LLVM_INSTALL_CMAKEDIR "@LLVM_INSTALL_CMAKE_DIR@"
+ #define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
+ #define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
+ #define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
+diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
+index 1a2f04552d13..44fa7d3eec6b 100644
+--- a/tools/llvm-config/llvm-config.cpp
++++ b/tools/llvm-config/llvm-config.cpp
+@@ -357,12 +357,26 @@ int main(int argc, char **argv) {
+         ("-I" + ActiveIncludeDir + " " + "-I" + ActiveObjRoot + "/include");
+   } else {
+     ActivePrefix = CurrentExecPrefix;
+-    ActiveIncludeDir = ActivePrefix + "/include";
+-    SmallString<256> path(StringRef(LLVM_TOOLS_INSTALL_DIR));
+-    sys::fs::make_absolute(ActivePrefix, path);
+-    ActiveBinDir = std::string(path.str());
+-    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
+-    ActiveCMakeDir = ActiveLibDir + "/cmake/llvm";
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_INCLUDEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveIncludeDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_BINDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveBinDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveLibDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_CMAKEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveCMakeDir = std::string(path.str());
++    }
+     ActiveIncludeOption = "-I" + ActiveIncludeDir;
+   }
+ 
+diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
+index 2963f97cad88..69d66c9c9ca1 100644
+--- a/tools/lto/CMakeLists.txt
++++ b/tools/lto/CMakeLists.txt
+@@ -25,7 +25,7 @@ add_llvm_library(LTO SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES} DEPENDS
+     intrinsics_gen)
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/lto.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT LTO)
+ 
+ if (APPLE)
+diff --git a/tools/opt-viewer/CMakeLists.txt b/tools/opt-viewer/CMakeLists.txt
+index ead73ec13a8f..250362021f17 100644
+--- a/tools/opt-viewer/CMakeLists.txt
++++ b/tools/opt-viewer/CMakeLists.txt
+@@ -8,7 +8,7 @@ set (files
+ 
+ foreach (file ${files})
+   install(PROGRAMS ${file}
+-    DESTINATION share/opt-viewer
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/opt-viewer
+     COMPONENT opt-viewer)
+ endforeach (file)
+ 
+diff --git a/tools/remarks-shlib/CMakeLists.txt b/tools/remarks-shlib/CMakeLists.txt
+index 865436247270..ce1daa62f6ab 100644
+--- a/tools/remarks-shlib/CMakeLists.txt
++++ b/tools/remarks-shlib/CMakeLists.txt
+@@ -19,7 +19,7 @@ if(LLVM_ENABLE_PIC)
+   endif()
+   
+   install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/Remarks.h
+-    DESTINATION include/llvm-c
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+     COMPONENT Remarks)
+ 
+   if (APPLE)
diff --git a/pkgs/development/compilers/llvm/12/llvm/llvm-outputs.patch b/pkgs/development/compilers/llvm/12/llvm/outputs.patch
index 40096fa3497..40096fa3497 100644
--- a/pkgs/development/compilers/llvm/12/llvm/llvm-outputs.patch
+++ b/pkgs/development/compilers/llvm/12/llvm/outputs.patch
diff --git a/pkgs/development/compilers/llvm/5/clang/default.nix b/pkgs/development/compilers/llvm/5/clang/default.nix
index 21961f4f041..bbeb9277683 100644
--- a/pkgs/development/compilers/llvm/5/clang/default.nix
+++ b/pkgs/development/compilers/llvm/5/clang/default.nix
@@ -1,4 +1,5 @@
-{ lib, stdenv, fetch, cmake, libxml2, llvm, version, clang-tools-extra_src, python3
+{ lib, stdenv, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+, buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
 }:
@@ -22,20 +23,27 @@ let
       ++ lib.optional enableManpages python3.pkgs.sphinx
       ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-    buildInputs = [ libxml2 llvm ];
+    buildInputs = [ libxml2 libllvm ];
 
     cmakeFlags = [
       "-DCMAKE_CXX_FLAGS=-std=c++11"
       "-DLLVM_ENABLE_RTTI=ON"
+      "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
     ] ++ lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"
       "-DSPHINX_OUTPUT_MAN=ON"
       "-DSPHINX_OUTPUT_HTML=OFF"
       "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
     ];
 
-    patches = [ ./purity.patch ];
+    patches = [
+      ./purity.patch
+      ./gnu-install-dirs.patch
+    ];
 
     postPatch = ''
       sed -i -e 's/DriverArgs.hasArg(options::OPT_nostdlibinc)/true/' \
@@ -48,12 +56,12 @@ let
       sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
     '';
 
-    outputs = [ "out" "lib" "python" ];
+    outputs = [ "out" "lib" "dev" "python" ];
 
     # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${llvm}/lib/LLVMgold.so ]; then
-        ln -sv ${llvm}/lib/LLVMgold.so $out/lib
+      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
+        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
       fi
 
       ln -sv $out/bin/clang $out/bin/cpp
@@ -70,11 +78,14 @@ let
       fi
       mv $out/share/clang/*.py $python/share/clang
       rm $out/bin/c-index-test
+
+      mkdir -p $dev/bin
+      cp bin/clang-tblgen $dev/bin
     '';
 
     passthru = {
       isClang = true;
-      inherit llvm;
+      inherit libllvm;
     };
 
     meta = {
diff --git a/pkgs/development/compilers/llvm/5/clang/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/5/clang/gnu-install-dirs.patch
new file mode 100644
index 00000000000..7e6903222f4
--- /dev/null
+++ b/pkgs/development/compilers/llvm/5/clang/gnu-install-dirs.patch
@@ -0,0 +1,242 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 2667b1d6892e..87c5ad58738f 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -5,6 +5,8 @@ cmake_minimum_required(VERSION 3.4.3)
+ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
+   project(Clang)
+ 
++  include(GNUInstallDirs)
++
+   # Rely on llvm-config.
+   set(CONFIG_OUTPUT)
+   find_program(LLVM_CONFIG "llvm-config")
+@@ -344,7 +346,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/clang include/clang-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.def"
+     PATTERN "*.h"
+@@ -353,7 +355,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "CMakeFiles" EXCLUDE
+     PATTERN "*.inc"
+@@ -361,7 +363,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(PROGRAMS utils/bash-autocomplete.sh
+-    DESTINATION share/clang
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+     )
+ endif()
+ 
+diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
+index e657059744a4..19da44638fe6 100644
+--- a/cmake/modules/AddClang.cmake
++++ b/cmake/modules/AddClang.cmake
+@@ -99,9 +99,9 @@ macro(add_clang_library name)
+       install(TARGETS ${name}
+         COMPONENT ${name}
+         ${export_to_clangtargets}
+-        LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        RUNTIME DESTINATION bin)
++        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+       if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+         add_custom_target(install-${name}
+@@ -143,7 +143,7 @@ macro(add_clang_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_clangtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -160,5 +160,5 @@ endmacro()
+ macro(add_clang_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
+index a621c02644e3..e140efc9c83c 100644
+--- a/lib/Headers/CMakeLists.txt
++++ b/lib/Headers/CMakeLists.txt
+@@ -129,13 +129,13 @@ install(
+   FILES ${files} ${CMAKE_CURRENT_BINARY_DIR}/arm_neon.h
+   COMPONENT clang-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ install(
+   FILES ${cuda_wrapper_files}
+   COMPONENT clang-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include/cuda_wrappers)
++  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include/cuda_wrappers)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDE's.
+   add_custom_target(install-clang-headers
+diff --git a/tools/c-index-test/CMakeLists.txt b/tools/c-index-test/CMakeLists.txt
+index ad990e010eef..92e52d05afb9 100644
+--- a/tools/c-index-test/CMakeLists.txt
++++ b/tools/c-index-test/CMakeLists.txt
+@@ -48,7 +48,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
+        "@executable_path/../../lib")
+   else()
+-    set(INSTALL_DESTINATION bin)
++    set(INSTALL_DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endif()
+ 
+   install(TARGETS c-index-test
+diff --git a/tools/clang-check/CMakeLists.txt b/tools/clang-check/CMakeLists.txt
+index 04151a8e0331..13918d91c4ba 100644
+--- a/tools/clang-check/CMakeLists.txt
++++ b/tools/clang-check/CMakeLists.txt
+@@ -19,4 +19,4 @@ target_link_libraries(clang-check
+   )
+ 
+ install(TARGETS clang-check
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-format/CMakeLists.txt b/tools/clang-format/CMakeLists.txt
+index a13633eaefc4..9b0094783690 100644
+--- a/tools/clang-format/CMakeLists.txt
++++ b/tools/clang-format/CMakeLists.txt
+@@ -20,20 +20,20 @@ if( LLVM_USE_SANITIZE_COVERAGE )
+ endif()
+ 
+ install(PROGRAMS clang-format-bbedit.applescript
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-diff.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-sublime.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS git-clang-format
+-  DESTINATION bin
++  DESTINATION ${CMAKE_INSTALL_BINDIR}
+   COMPONENT clang-format)
+diff --git a/tools/clang-offload-bundler/CMakeLists.txt b/tools/clang-offload-bundler/CMakeLists.txt
+index 6161d08ae587..a003292d1676 100644
+--- a/tools/clang-offload-bundler/CMakeLists.txt
++++ b/tools/clang-offload-bundler/CMakeLists.txt
+@@ -21,4 +21,4 @@ target_link_libraries(clang-offload-bundler
+   ${CLANG_OFFLOAD_BUNDLER_LIB_DEPS}
+   )
+ 
+-install(TARGETS clang-offload-bundler RUNTIME DESTINATION bin)
++install(TARGETS clang-offload-bundler RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-rename/CMakeLists.txt b/tools/clang-rename/CMakeLists.txt
+index 771e3bdea6f0..d1396e62b28f 100644
+--- a/tools/clang-rename/CMakeLists.txt
++++ b/tools/clang-rename/CMakeLists.txt
+@@ -14,11 +14,11 @@ target_link_libraries(clang-rename
+   clangToolingRefactor
+   )
+ 
+-install(TARGETS clang-rename RUNTIME DESTINATION bin)
++install(TARGETS clang-rename RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ install(PROGRAMS clang-rename.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+ install(PROGRAMS clang-rename.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
+index 2dd670307636..1fe576f77ddb 100644
+--- a/tools/libclang/CMakeLists.txt
++++ b/tools/libclang/CMakeLists.txt
+@@ -121,7 +121,7 @@ endif()
+ if(INTERNAL_INSTALL_PREFIX)
+   set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
+ else()
+-  set(LIBCLANG_HEADERS_INSTALL_DESTINATION include)
++  set(LIBCLANG_HEADERS_INSTALL_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+ endif()
+ 
+ install(DIRECTORY ../../include/clang-c
+diff --git a/tools/scan-build/CMakeLists.txt b/tools/scan-build/CMakeLists.txt
+index 380379300b09..adfd58ed5f7d 100644
+--- a/tools/scan-build/CMakeLists.txt
++++ b/tools/scan-build/CMakeLists.txt
+@@ -41,7 +41,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/bin/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
++    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endforeach()
+ 
+   foreach(LibexecFile ${LibexecFiles})
+@@ -53,7 +53,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/libexec/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libexec/${LibexecFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/libexec/${LibexecFile})
+-    install(PROGRAMS libexec/${LibexecFile} DESTINATION libexec)
++    install(PROGRAMS libexec/${LibexecFile} DESTINATION ${CMAKE_INSTALL_LIBEXECDIR})
+   endforeach()
+ 
+   foreach(ManPage ${ManPages})
+@@ -77,7 +77,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/share/scan-build/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/scan-build/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-build/${ShareFile})
+-    install(FILES share/scan-build/${ShareFile} DESTINATION share/scan-build)
++    install(FILES share/scan-build/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-build)
+   endforeach()
+ 
+   add_custom_target(scan-build ALL DEPENDS ${Depends})
+diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
+index b305ca562a72..554bcb379061 100644
+--- a/tools/scan-view/CMakeLists.txt
++++ b/tools/scan-view/CMakeLists.txt
+@@ -21,7 +21,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                          ${CMAKE_BINARY_DIR}/bin/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
++    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endforeach()
+ 
+   foreach(ShareFile ${ShareFiles})
+@@ -33,7 +33,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                          ${CMAKE_BINARY_DIR}/share/scan-view/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-view/${ShareFile})
+-    install(FILES share/${ShareFile} DESTINATION share/scan-view)
++    install(FILES share/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-view)
+   endforeach()
+ 
+   add_custom_target(scan-view ALL DEPENDS ${Depends})
diff --git a/pkgs/development/compilers/llvm/5/compiler-rt/default.nix b/pkgs/development/compilers/llvm/5/compiler-rt/default.nix
index 705c5994bd1..7e85c420da0 100644
--- a/pkgs/development/compilers/llvm/5/compiler-rt/default.nix
+++ b/pkgs/development/compilers/llvm/5/compiler-rt/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation {
   inherit version;
   src = fetch "compiler-rt" "0ipd4jdxpczgr2w6lzrabymz6dhzj69ywmyybjjc1q397zgrvziy";
 
-  nativeBuildInputs = [ cmake python3 llvm ];
+  nativeBuildInputs = [ cmake python3 llvm.dev ];
   buildInputs = lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
   NIX_CFLAGS_COMPILE = [
@@ -54,6 +54,7 @@ stdenv.mkDerivation {
     ./codesign.patch # Revert compiler-rt commit that makes codesign mandatory
     # https://github.com/llvm/llvm-project/commit/947f9692440836dcb8d88b74b69dd379d85974ce
     ../../common/compiler-rt/glibc.patch
+    ./gnu-install-dirs.patch
   ] ++ lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
     ++ lib.optional (stdenv.hostPlatform.libc == "glibc") ./sys-ustat.patch
     ++ lib.optional stdenv.hostPlatform.isAarch32 ./armv7l.patch;
diff --git a/pkgs/development/compilers/llvm/5/compiler-rt/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/5/compiler-rt/gnu-install-dirs.patch
new file mode 100644
index 00000000000..618e597e96d
--- /dev/null
+++ b/pkgs/development/compilers/llvm/5/compiler-rt/gnu-install-dirs.patch
@@ -0,0 +1,103 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index f997c53410c1..ac079d89b57b 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -12,6 +12,7 @@ cmake_minimum_required(VERSION 3.4.3)
+ # Check if compiler-rt is built as a standalone project.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR COMPILER_RT_STANDALONE_BUILD)
+   project(CompilerRT C CXX ASM)
++  include(GNUInstallDirs)
+   set(COMPILER_RT_STANDALONE_BUILD TRUE)
+ endif()
+ 
+diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake
+index bc5fb9ff722b..91fb79d1980c 100644
+--- a/cmake/Modules/AddCompilerRT.cmake
++++ b/cmake/Modules/AddCompilerRT.cmake
+@@ -344,7 +344,7 @@ macro(add_compiler_rt_resource_file target_name file_name component)
+   add_custom_target(${target_name} DEPENDS ${dst_file})
+   # Install in Clang resource directory.
+   install(FILES ${file_name}
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_PREFIX}
+     COMPONENT ${component})
+   add_dependencies(${component} ${target_name})
+ 
+@@ -361,7 +361,7 @@ macro(add_compiler_rt_script name)
+   add_custom_target(${name} DEPENDS ${dst})
+   install(FILES ${dst}
+     PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/bin)
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_BINDIR})
+ endmacro(add_compiler_rt_script src name)
+ 
+ # Builds custom version of libc++ and installs it in <prefix>.
+diff --git a/cmake/Modules/CompilerRTDarwinUtils.cmake b/cmake/Modules/CompilerRTDarwinUtils.cmake
+index f646975475bb..75885bf305b8 100644
+--- a/cmake/Modules/CompilerRTDarwinUtils.cmake
++++ b/cmake/Modules/CompilerRTDarwinUtils.cmake
+@@ -391,7 +391,7 @@ macro(darwin_add_embedded_builtin_libraries)
+     set(DARWIN_macho_embedded_LIBRARY_OUTPUT_DIR
+       ${COMPILER_RT_OUTPUT_DIR}/lib/macho_embedded)
+     set(DARWIN_macho_embedded_LIBRARY_INSTALL_DIR
+-      ${COMPILER_RT_INSTALL_PATH}/lib/macho_embedded)
++      ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/macho_embedded)
+       
+     set(CFLAGS_armv7 "-target thumbv7-apple-darwin-eabi")
+     set(CFLAGS_i386 "-march=pentium")
+diff --git a/cmake/base-config-ix.cmake b/cmake/base-config-ix.cmake
+index b38c6ca96fac..a4580414cbc8 100644
+--- a/cmake/base-config-ix.cmake
++++ b/cmake/base-config-ix.cmake
+@@ -43,11 +43,11 @@ if (LLVM_TREE_AVAILABLE)
+ else()
+     # Take output dir and install path from the user.
+   set(COMPILER_RT_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH
+-    "Path where built compiler-rt libraries should be stored.")
++    "Path where built compiler-rt build artifacts should be stored.")
+   set(COMPILER_RT_EXEC_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/bin CACHE PATH
+     "Path where built compiler-rt executables should be stored.")
+-  set(COMPILER_RT_INSTALL_PATH ${CMAKE_INSTALL_PREFIX} CACHE PATH
+-    "Path where built compiler-rt libraries should be installed.")
++  set(COMPILER_RT_INSTALL_PATH "" CACHE PATH
++    "Prefix where built compiler-rt artifacts should be installed, comes before CMAKE_INSTALL_PREFIX.")
+   option(COMPILER_RT_INCLUDE_TESTS "Generate and build compiler-rt unit tests." OFF)
+   option(COMPILER_RT_ENABLE_WERROR "Fail and stop if warning is triggered" OFF)
+   # Use a host compiler to compile/link tests.
+@@ -67,9 +67,9 @@ if(NOT DEFINED COMPILER_RT_OS_DIR)
+   string(TOLOWER ${CMAKE_SYSTEM_NAME} COMPILER_RT_OS_DIR)
+ endif()
+ set(COMPILER_RT_LIBRARY_OUTPUT_DIR
+-  ${COMPILER_RT_OUTPUT_DIR}/lib/${COMPILER_RT_OS_DIR})
++  ${COMPILER_RT_OUTPUT_DIR}/${CMAKE_INSTALL_FULL_LIBDIR}/${COMPILER_RT_OS_DIR})
+ set(COMPILER_RT_LIBRARY_INSTALL_DIR
+-  ${COMPILER_RT_INSTALL_PATH}/lib/${COMPILER_RT_OS_DIR})
++  ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${COMPILER_RT_OS_DIR})
+ 
+ if(APPLE)
+   # On Darwin if /usr/include doesn't exist, the user probably has Xcode but not
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index ec3bf40b95e6..af119f10ee2b 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -44,8 +44,8 @@ set_target_properties(compiler-rt-headers PROPERTIES FOLDER "Compiler-RT Misc")
+ # Install sanitizer headers.
+ install(FILES ${SANITIZER_HEADERS}
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/sanitizer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/sanitizer)
+ # Install xray headers.
+ install(FILES ${XRAY_HEADERS}
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/xray)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/xray)
+diff --git a/lib/dfsan/CMakeLists.txt b/lib/dfsan/CMakeLists.txt
+index 2c486bff821b..0ee715da95f8 100644
+--- a/lib/dfsan/CMakeLists.txt
++++ b/lib/dfsan/CMakeLists.txt
+@@ -44,4 +44,4 @@ add_custom_command(OUTPUT ${dfsan_abilist_filename}
+                    DEPENDS done_abilist.txt libc_ubuntu1404_abilist.txt)
+ add_dependencies(dfsan dfsan_abilist)
+ install(FILES ${dfsan_abilist_filename}
+-        DESTINATION ${COMPILER_RT_INSTALL_PATH})
++        DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_PREFIX})
diff --git a/pkgs/development/compilers/llvm/5/default.nix b/pkgs/development/compilers/llvm/5/default.nix
index 86bba415c01..c416964b22a 100644
--- a/pkgs/development/compilers/llvm/5/default.nix
+++ b/pkgs/development/compilers/llvm/5/default.nix
@@ -1,6 +1,5 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, gccForLibs
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith
-, buildPackages
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 }:
@@ -18,34 +17,43 @@ let
   clang-tools-extra_src = fetch "clang-tools-extra" "018b3fiwah8f8br5i26qmzh6sjvzchpn358sn8v079m49f2jldm3";
 
   tools = lib.makeExtensible (tools: let
-    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch; });
+    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch buildLlvmTools; });
     mkExtraBuildCommands = cc: ''
       rsrc="$out/resource-root"
       mkdir "$rsrc"
-      ln -s "${cc}/lib/clang/${release_version}/include" "$rsrc"
+      ln -s "${cc.lib}/lib/clang/${release_version}/include" "$rsrc"
       ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
       echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
     '';
+
   in {
 
-    llvm = callPackage ./llvm { };
+    libllvm = callPackage ./llvm { };
+
+    # `llvm` historically had the binaries.  When choosing an output explicitly,
+    # we need to reintroduce `outputUnspecified` to get the expected behavior e.g. of lib.get*
+    llvm = tools.libllvm.out // { outputUnspecified = true; };
+
+    libllvm-polly = callPackage ./llvm { enablePolly = true; };
 
-    clang-unwrapped = callPackage ./clang {
+    llvm-polly = tools.libllvm-polly.lib // { outputUnspecified = true; };
+
+    libclang = callPackage ./clang {
       inherit clang-tools-extra_src;
     };
 
-    llvm-manpages = lowPrio (tools.llvm.override {
+    clang-unwrapped = tools.libclang.out // { outputUnspecified = true; };
+
+    llvm-manpages = lowPrio (tools.libllvm.override {
       enableManpages = true;
       python3 = pkgs.python3;  # don't use python-boot
     });
 
-    clang-manpages = lowPrio (tools.clang-unwrapped.override {
+    clang-manpages = lowPrio (tools.libclang.override {
       enableManpages = true;
       python3 = pkgs.python3;  # don't use python-boot
     });
 
-    libclang = tools.clang-unwrapped.lib;
-
     clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
 
     libstdcxxClang = wrapCCWith rec {
diff --git a/pkgs/development/compilers/llvm/5/libc++/default.nix b/pkgs/development/compilers/llvm/5/libc++/default.nix
index 164836e1a4c..77421b4e6d8 100644
--- a/pkgs/development/compilers/llvm/5/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/5/libc++/default.nix
@@ -11,7 +11,11 @@ stdenv.mkDerivation {
     export LIBCXXABI_INCLUDE_DIR="$PWD/$(ls -d libcxxabi-${version}*)/include"
   '';
 
-  patches = lib.optionals stdenv.hostPlatform.isMusl [
+  outputs = [ "out" "dev" ];
+
+  patches = [
+    ./gnu-install-dirs.patch
+  ] ++ lib.optionals stdenv.hostPlatform.isMusl [
     ../../libcxx-0001-musl-hacks.patch
   ];
 
diff --git a/pkgs/development/compilers/llvm/5/libc++/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/5/libc++/gnu-install-dirs.patch
new file mode 100644
index 00000000000..d9ea0dc7dfd
--- /dev/null
+++ b/pkgs/development/compilers/llvm/5/libc++/gnu-install-dirs.patch
@@ -0,0 +1,72 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index ca5afba86d19..ed69e4043c3d 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -22,6 +22,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   project(libcxx CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxx)
+   set(PACKAGE_VERSION 5.0.0)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+diff --git a/cmake/Modules/HandleLibCXXABI.cmake b/cmake/Modules/HandleLibCXXABI.cmake
+index b1f6bee8f945..1b455fceed7f 100644
+--- a/cmake/Modules/HandleLibCXXABI.cmake
++++ b/cmake/Modules/HandleLibCXXABI.cmake
+@@ -55,7 +55,7 @@ macro(setup_abi_lib abidefines abilib abifiles abidirs)
+           )
+         if (LIBCXX_INSTALL_HEADERS)
+           install(FILES "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}"
+-            DESTINATION ${LIBCXX_INSTALL_PREFIX}include/c++/v1/${dstdir}
++            DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dstdir}
+             COMPONENT libcxx
+             PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+             )
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index 5a1b2ccdc426..106d3d6c1d3c 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -20,7 +20,7 @@ endif()
+ 
+ if (LIBCXX_INSTALL_HEADERS)
+   install(DIRECTORY .
+-    DESTINATION ${LIBCXX_INSTALL_PREFIX}include/c++/v1
++    DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1
+     COMPONENT cxx-headers
+     FILES_MATCHING
+     ${LIBCXX_HEADER_PATTERN}
+@@ -44,7 +44,7 @@ if (LIBCXX_INSTALL_HEADERS)
+     set(generated_config_deps generate_config_header)
+     # Install the generated header as __config.
+     install(FILES ${LIBCXX_BINARY_DIR}/__generated_config
+-      DESTINATION ${LIBCXX_INSTALL_PREFIX}include/c++/v1
++      DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+       RENAME __config
+       COMPONENT cxx-headers)
+diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
+index 578651423f3b..277befd631ac 100644
+--- a/lib/CMakeLists.txt
++++ b/lib/CMakeLists.txt
+@@ -355,8 +355,8 @@ if (LIBCXX_INSTALL_LIBRARY)
+     set(experimental_lib cxx_experimental)
+   endif()
+   install(TARGETS ${LIBCXX_TARGETS} ${experimental_lib}
+-    LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
+-    ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
++    LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
++    ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
+     )
+   # NOTE: This install command must go after the cxx install command otherwise
+   # it will not be executed after the library symlinks are installed.
+@@ -364,7 +364,7 @@ if (LIBCXX_INSTALL_LIBRARY)
+     # Replace the libc++ filename with $<TARGET_LINKER_FILE:cxx>
+     # after we required CMake 3.0.
+     install(FILES "${LIBCXX_LIBRARY_DIR}/libc++${CMAKE_SHARED_LIBRARY_SUFFIX}"
+-      DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX}
++      DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX}
+       COMPONENT libcxx)
+   endif()
+ endif()
diff --git a/pkgs/development/compilers/llvm/5/libc++abi/default.nix b/pkgs/development/compilers/llvm/5/libc++abi/default.nix
index dd148a8917f..8bc3b9e2977 100644
--- a/pkgs/development/compilers/llvm/5/libc++abi/default.nix
+++ b/pkgs/development/compilers/llvm/5/libc++abi/default.nix
@@ -6,8 +6,7 @@ stdenv.mkDerivation {
 
   src = fetch "libcxxabi" "12lp799rskr4fc2xr64qn4jfkjnfd8b1aymvsxyn4k9ar7r9pgqv";
 
-  nativeBuildInputs = [ cmake ];
-  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD) libunwind;
+  outputs = [ "out" "dev" ];
 
   postUnpack = ''
     unpackFile ${libcxx.src}
@@ -19,6 +18,13 @@ stdenv.mkDerivation {
     patch -p1 -d $(ls -d libcxx-*) -i ${../../libcxx-0001-musl-hacks.patch}
   '';
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD) libunwind;
+
   installPhase = if stdenv.isDarwin
     then ''
       for file in lib/*.dylib; do
diff --git a/pkgs/development/compilers/llvm/5/libc++abi/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/5/libc++abi/gnu-install-dirs.patch
new file mode 100644
index 00000000000..760d7194f7b
--- /dev/null
+++ b/pkgs/development/compilers/llvm/5/libc++abi/gnu-install-dirs.patch
@@ -0,0 +1,28 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 4db3328deb9c..74b39acfe588 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -20,6 +20,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   project(libcxxabi CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxxabi)
+   set(PACKAGE_VERSION 5.0.0)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index adcc412880c9..71758665af05 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -174,8 +174,8 @@ endif()
+ add_custom_target(cxxabi DEPENDS ${LIBCXXABI_TARGETS})
+ 
+ install(TARGETS ${LIBCXXABI_TARGETS}
+-  LIBRARY DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
+-  ARCHIVE DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
++  LIBRARY DESTINATION ${LIBCXXABI_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
++  ARCHIVE DESTINATION ${LIBCXXABI_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
+   )
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES)
diff --git a/pkgs/development/compilers/llvm/5/lld/default.nix b/pkgs/development/compilers/llvm/5/lld/default.nix
index 244960cf41b..73762e2d2e5 100644
--- a/pkgs/development/compilers/llvm/5/lld/default.nix
+++ b/pkgs/development/compilers/llvm/5/lld/default.nix
@@ -1,7 +1,8 @@
 { lib, stdenv
+, buildLlvmTools
 , fetch
 , cmake
-, llvm
+, libllvm
 , version
 }:
 
@@ -11,15 +12,20 @@ stdenv.mkDerivation {
 
   src = fetch "lld" "1ah75rjly6747jk1zbwca3z0svr9b09ylgxd4x9ns721xir6sia6";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ llvm ];
+  buildInputs = [ libllvm ];
 
-  outputs = [ "out" "dev" ];
+  cmakeFlags = [
+    "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
+  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+  ];
 
-  postInstall = ''
-    moveToOutput include "$dev"
-    moveToOutput lib "$dev"
-  '';
+  outputs = [ "out" "lib" "dev" ];
 
   meta = {
     description = "The LLVM Linker";
diff --git a/pkgs/development/compilers/llvm/5/lld/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/5/lld/gnu-install-dirs.patch
new file mode 100644
index 00000000000..ed673870dec
--- /dev/null
+++ b/pkgs/development/compilers/llvm/5/lld/gnu-install-dirs.patch
@@ -0,0 +1,68 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index e2ab0e35f1ab..f68e23d2a70d 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -6,6 +6,8 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   set(CMAKE_INCLUDE_CURRENT_DIR ON)
+   set(LLD_BUILT_STANDALONE TRUE)
+ 
++  include(GNUInstallDirs)
++
+   find_program(LLVM_CONFIG_PATH "llvm-config" DOC "Path to llvm-config binary")
+   if(NOT LLVM_CONFIG_PATH)
+     message(FATAL_ERROR "llvm-config not found: specify LLVM_CONFIG_PATH")
+@@ -203,7 +205,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/cmake/modules/AddLLD.cmake b/cmake/modules/AddLLD.cmake
+index fd1d44199ca6..2ec1831ed8f6 100644
+--- a/cmake/modules/AddLLD.cmake
++++ b/cmake/modules/AddLLD.cmake
+@@ -20,9 +20,9 @@ macro(add_lld_library name)
+     install(TARGETS ${name}
+       COMPONENT ${name}
+       ${export_to_lldtargets}
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      RUNTIME DESTINATION bin)
++      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+     if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+       add_custom_target(install-${name}
+@@ -56,7 +56,7 @@ macro(add_lld_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_lldtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -73,5 +73,5 @@ endmacro()
+ macro(add_lld_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/tools/lld/CMakeLists.txt b/tools/lld/CMakeLists.txt
+index 2df10697ff66..94aa8d092220 100644
+--- a/tools/lld/CMakeLists.txt
++++ b/tools/lld/CMakeLists.txt
+@@ -13,7 +13,7 @@ target_link_libraries(lld
+   )
+ 
+ install(TARGETS lld
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ if(NOT LLD_SYMLINKS_TO_CREATE)
+   set(LLD_SYMLINKS_TO_CREATE lld-link ld.lld)
diff --git a/pkgs/development/compilers/llvm/5/lldb/default.nix b/pkgs/development/compilers/llvm/5/lldb/default.nix
index 61a9e60391c..723792d1341 100644
--- a/pkgs/development/compilers/llvm/5/lldb/default.nix
+++ b/pkgs/development/compilers/llvm/5/lldb/default.nix
@@ -8,14 +8,14 @@
 , which
 , libedit
 , libxml2
-, llvm
-, clang-unwrapped
+, libllvm
+, libclang
 , python3
 , version
 , darwin
 }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "lldb";
   inherit version;
 
@@ -28,29 +28,46 @@ stdenv.mkDerivation {
       sha256 = "1zbx4m0m8kbg0wq6740jcw151vb2pb1p25p401wiq8diqqagkjps";
       stripLen = 1;
     })
+    ./gnu-install-dirs.patch
   ];
 
   postPatch = ''
     # Fix up various paths that assume llvm and clang are installed in the same place
-    sed -i 's,".*ClangConfig.cmake","${clang-unwrapped}/lib/cmake/clang/ClangConfig.cmake",' \
+    sed -i 's,".*ClangConfig.cmake","${libclang.dev}/lib/cmake/clang/ClangConfig.cmake",' \
       cmake/modules/LLDBStandalone.cmake
-    sed -i 's,".*tools/clang/include","${clang-unwrapped}/include",' \
+    sed -i 's,".*tools/clang/include","${libclang.dev}/include",' \
       cmake/modules/LLDBStandalone.cmake
-    sed -i 's,"$.LLVM_LIBRARY_DIR.",${llvm}/lib ${clang-unwrapped}/lib,' \
+    sed -i 's,"$.LLVM_LIBRARY_DIR.",${libllvm.lib}/lib ${libclang.lib}/lib,' \
       cmake/modules/LLDBStandalone.cmake
   '';
 
-  nativeBuildInputs = [ cmake python3 which swig ];
-  buildInputs = [ ncurses zlib libedit libxml2 llvm ]
-    ++ lib.optionals stdenv.isDarwin [ darwin.libobjc darwin.apple_sdk.libs.xpc darwin.apple_sdk.frameworks.Foundation darwin.bootstrap_cmds darwin.apple_sdk.frameworks.Carbon darwin.apple_sdk.frameworks.Cocoa ];
+  outputs = [ "out" "lib" "dev" ];
+
+  nativeBuildInputs = [
+    cmake python3 which swig
+  ];
+
+  buildInputs = [
+    ncurses zlib libedit libxml2 libllvm
+  ] ++ lib.optionals stdenv.isDarwin [
+    darwin.libobjc
+    darwin.apple_sdk.libs.xpc
+    darwin.apple_sdk.frameworks.Foundation darwin.bootstrap_cmds darwin.apple_sdk.frameworks.Carbon darwin.apple_sdk.frameworks.Cocoa
+  ];
 
   CXXFLAGS = "-fno-rtti";
   hardeningDisable = [ "format" ];
 
   cmakeFlags = [
+    "-DLLDB_INCLUDE_TESTS=${if doCheck then "YES" else "NO"}"
     "-DLLDB_CODESIGN_IDENTITY=" # codesigning makes nondeterministic
+  ] ++ lib.optionals doCheck [
+    "-DLLDB_TEST_C_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
+    "-DLLDB_TEST_CXX_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++"
   ];
 
+  doCheck = false;
+
   postInstall = ''
     mkdir -p $out/share/man/man1
     cp ../docs/lldb.1 $out/share/man/man1/
diff --git a/pkgs/development/compilers/llvm/5/lldb/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/5/lldb/gnu-install-dirs.patch
new file mode 100644
index 00000000000..5c6193b028f
--- /dev/null
+++ b/pkgs/development/compilers/llvm/5/lldb/gnu-install-dirs.patch
@@ -0,0 +1,76 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index ada293811b3e..6c2149309f65 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -7,6 +7,8 @@ set(CMAKE_MODULE_PATH
+   "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules"
+   )
+ 
++include(GNUInstallDirs)
++
+ include(LLDBStandalone)
+ include(LLDBConfig)
+ include(AddLLDB)
+diff --git a/cmake/modules/AddLLDB.cmake b/cmake/modules/AddLLDB.cmake
+index 4c6f1efd673d..179a12b49cce 100644
+--- a/cmake/modules/AddLLDB.cmake
++++ b/cmake/modules/AddLLDB.cmake
+@@ -54,14 +54,14 @@ function(add_lldb_library name)
+         endif()
+         install(TARGETS ${name}
+           COMPONENT ${name}
+-          RUNTIME DESTINATION bin
++          RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+           LIBRARY DESTINATION ${out_dir}
+           ARCHIVE DESTINATION ${out_dir})
+       else()
+         install(TARGETS ${name}
+           COMPONENT ${name}
+-          LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-          ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++          LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++          ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+       endif()
+       if (NOT CMAKE_CONFIGURATION_TYPES)
+         add_custom_target(install-${name}
+@@ -126,7 +126,7 @@ function(add_lldb_executable name)
+   if(ARG_GENERATE_INSTALL AND NOT (ARG_INCLUDE_IN_FRAMEWORK AND LLDB_BUILD_FRAMEWORK ))
+     install(TARGETS ${name}
+           COMPONENT ${name}
+-          RUNTIME DESTINATION bin)
++          RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+     if (NOT CMAKE_CONFIGURATION_TYPES)
+       add_custom_target(install-${name}
+                         DEPENDS ${name}
+diff --git a/cmake/modules/LLDBConfig.cmake b/cmake/modules/LLDBConfig.cmake
+index 726552675f47..f1f769f34446 100644
+--- a/cmake/modules/LLDBConfig.cmake
++++ b/cmake/modules/LLDBConfig.cmake
+@@ -276,7 +276,7 @@ include_directories(BEFORE
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+     COMPONENT lldb_headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+@@ -286,7 +286,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
+     COMPONENT lldb_headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/tools/intel-mpx/CMakeLists.txt b/tools/intel-mpx/CMakeLists.txt
+index 29ba9a1cacec..30e2f9334b95 100644
+--- a/tools/intel-mpx/CMakeLists.txt
++++ b/tools/intel-mpx/CMakeLists.txt
+@@ -12,4 +12,4 @@ target_link_libraries(lldb-intel-mpxtable
+                       PUBLIC liblldb LLVMSupport)
+ 
+ install(TARGETS lldb-intel-mpxtable
+-  LIBRARY DESTINATION bin)
++  LIBRARY DESTINATION ${CMAKE_INSTALL_BINDIR})
diff --git a/pkgs/development/compilers/llvm/5/llvm/default.nix b/pkgs/development/compilers/llvm/5/llvm/default.nix
index 94d2a1e5863..0cbd30c783c 100644
--- a/pkgs/development/compilers/llvm/5/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/5/llvm/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv
+, pkgsBuildBuild
 , fetch
 , fetchpatch
 , cmake
@@ -10,9 +11,11 @@
 , version
 , release_version
 , zlib
+, buildLlvmTools
 , debugVersion ? false
 , enableManpages ? false
 , enableSharedLibraries ? !enableManpages
+, enablePolly ? false
 }:
 
 let
@@ -29,15 +32,18 @@ stdenv.mkDerivation ({
   inherit version;
 
   src = fetch "llvm" "0g1bbj2n6xv4p1n6hh17vj3vpvg56wacipc81dgwga9mg2lys8nm";
+  polly_src = fetch "polly" "1f4i1qsw7ywx25v262p8syz339zcbvfkx295xz26hmqrn944xa6x";
 
   unpackPhase = ''
     unpackFile $src
     mv llvm-${version}* llvm
     sourceRoot=$PWD/llvm
+  '' + optionalString enablePolly ''
+    unpackFile $polly_src
+    mv polly-* $sourceRoot/tools/polly
   '';
 
-  outputs = [ "out" "python" ]
-    ++ optional enableSharedLibraries "lib";
+  outputs = [ "out" "lib" "dev" "python" ];
 
   nativeBuildInputs = [ cmake python3 ]
     ++ optional enableManpages python3.pkgs.sphinx;
@@ -59,11 +65,13 @@ stdenv.mkDerivation ({
     #  sha256 = "0injj1hqgrbcbihhwp2nbal88jfykad30r54f2cdcx7gws2fcy8i";
     #  stripLen = 1;
     #})
-  ];
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
+
   postPatch = optionalString stdenv.isDarwin ''
     substituteInPlace cmake/modules/AddLLVM.cmake \
       --replace 'set(_install_name_dir INSTALL_NAME_DIR "@rpath")' "set(_install_name_dir)" \
-      --replace 'set(_install_rpath "@loader_path/../lib" ''${extra_libdir})' ""
+      --replace 'set(_install_rpath "@loader_path/../''${CMAKE_INSTALL_LIBDIR}" ''${extra_libdir})' ""
   ''
   # Patch llvm-config to return correct library path based on --link-{shared,static}.
   + optionalString (enableSharedLibraries) ''
@@ -90,6 +98,7 @@ stdenv.mkDerivation ({
   '';
 
   cmakeFlags = with stdenv; [
+    "-DLLVM_INSTALL_CMAKE_DIR=${placeholder "dev"}/lib/cmake/llvm/"
     "-DCMAKE_BUILD_TYPE=${if debugVersion then "Debug" else "Release"}"
     "-DLLVM_INSTALL_UTILS=ON"  # Needed by rustc
     "-DLLVM_BUILD_TESTS=ON"
@@ -100,20 +109,36 @@ stdenv.mkDerivation ({
     "-DLLVM_DEFAULT_TARGET_TRIPLE=${stdenv.hostPlatform.config}"
     "-DTARGET_TRIPLE=${stdenv.hostPlatform.config}"
   ]
-  ++ optional enableSharedLibraries
+  ++ lib.optional enableSharedLibraries
     "-DLLVM_LINK_LLVM_DYLIB=ON"
-  ++ optionals enableManpages [
+  ++ lib.optionals enableManpages [
     "-DLLVM_BUILD_DOCS=ON"
     "-DLLVM_ENABLE_SPHINX=ON"
     "-DSPHINX_OUTPUT_MAN=ON"
     "-DSPHINX_OUTPUT_HTML=OFF"
     "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
   ]
-  ++ optional (!isDarwin)
+  ++ lib.optional (!isDarwin)
     "-DLLVM_BINUTILS_INCDIR=${libbfd.dev}/include"
-  ++ optionals (isDarwin) [
+  ++ lib.optionals (isDarwin) [
     "-DLLVM_ENABLE_LIBCXX=ON"
     "-DCAN_TARGET_i386=false"
+  ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "-DCMAKE_CROSSCOMPILING=True"
+    "-DLLVM_TABLEGEN=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+    (
+      let
+        nativeCC = pkgsBuildBuild.targetPackages.stdenv.cc;
+        nativeBintools = nativeCC.bintools.bintools;
+        nativeToolchainFlags = [
+          "-DCMAKE_C_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}cc"
+          "-DCMAKE_CXX_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}c++"
+          "-DCMAKE_AR=${nativeBintools}/bin/${nativeBintools.targetPrefix}ar"
+          "-DCMAKE_STRIP=${nativeBintools}/bin/${nativeBintools.targetPrefix}strip"
+          "-DCMAKE_RANLIB=${nativeBintools}/bin/${nativeBintools.targetPrefix}ranlib"
+        ];
+      in "-DCROSS_TOOLCHAIN_FLAGS_NATIVE:list=${lib.concatStringsSep ";" nativeToolchainFlags}"
+    )
   ];
 
   postBuild = ''
@@ -127,21 +152,20 @@ stdenv.mkDerivation ({
   postInstall = ''
     mkdir -p $python/share
     mv $out/share/opt-viewer $python/share/opt-viewer
-  ''
-  + optionalString enableSharedLibraries ''
-    moveToOutput "lib/libLLVM-*" "$lib"
-    moveToOutput "lib/libLLVM${stdenv.hostPlatform.extensions.sharedLibrary}" "$lib"
-    moveToOutput "lib/libLTO${stdenv.hostPlatform.extensions.sharedLibrary}" "$lib"
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM-" "$lib/lib/libLLVM-"
+    moveToOutput "bin/llvm-config*" "$dev"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
+      --replace "\''${_IMPORT_PREFIX}/lib/lib" "$lib/lib/lib" \
+      --replace "$out/bin/llvm-config" "$dev/bin/llvm-config"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMConfig.cmake" \
+      --replace 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}")' 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}'"$lib"'")'
   ''
   + optionalString (stdenv.isDarwin && enableSharedLibraries) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM.dylib" "$lib/lib/libLLVM.dylib" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLTO.dylib" "$lib/lib/libLTO.dylib"
     ${lib.concatMapStringsSep "\n" (v: ''
       ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${v}.dylib
     '') versionSuffixes}
+  ''
+  + optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    cp NATIVE/bin/llvm-config $dev/bin/llvm-config-native
   '';
 
   doCheck = stdenv.isLinux && (!stdenv.isi686);
diff --git a/pkgs/development/compilers/llvm/5/llvm/gnu-install-dirs-polly.patch b/pkgs/development/compilers/llvm/5/llvm/gnu-install-dirs-polly.patch
new file mode 100644
index 00000000000..40f6fa06036
--- /dev/null
+++ b/pkgs/development/compilers/llvm/5/llvm/gnu-install-dirs-polly.patch
@@ -0,0 +1,106 @@
+diff --git a/tools/polly/CMakeLists.txt b/tools/polly/CMakeLists.txt
+index 9ddc0f7ff81d..7ca45f286d47 100644
+--- a/tools/polly/CMakeLists.txt
++++ b/tools/polly/CMakeLists.txt
+@@ -2,7 +2,11 @@
+ if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   project(Polly)
+   cmake_minimum_required(VERSION 3.4.3)
++endif()
++
++include(GNUInstallDirs)
+ 
++if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   # Where is LLVM installed?
+   find_package(LLVM CONFIG REQUIRED)
+   set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+@@ -157,14 +161,14 @@ include_directories(
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+     )
+ 
+   install(DIRECTORY ${POLLY_BINARY_DIR}/include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN "CMakeFiles" EXCLUDE
+diff --git a/tools/polly/cmake/CMakeLists.txt b/tools/polly/cmake/CMakeLists.txt
+index 969292cd6b00..d7aea77bdd20 100644
+--- a/tools/polly/cmake/CMakeLists.txt
++++ b/tools/polly/cmake/CMakeLists.txt
+@@ -79,18 +79,18 @@ file(GENERATE
+ 
+ # Generate PollyConfig.cmake for the install tree.
+ unset(POLLY_EXPORTS)
+-set(POLLY_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
++set(POLLY_INSTALL_PREFIX "")
+ set(POLLY_CONFIG_LLVM_CMAKE_DIR "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}")
++set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
++set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+ if (POLLY_BUNDLED_ISL)
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
+-    "${POLLY_INSTALL_PREFIX}/include/polly"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}/polly"
+     )
+ else()
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+     ${ISL_INCLUDE_DIRS}
+     )
+ endif()
+@@ -100,12 +100,12 @@ endif()
+ foreach(tgt IN LISTS POLLY_CONFIG_EXPORTED_TARGETS)
+   get_target_property(tgt_type ${tgt} TYPE)
+   if (tgt_type STREQUAL "EXECUTABLE")
+-    set(tgt_prefix "bin/")
++    set(tgt_prefix "${CMAKE_INSTALL_BINDIR}/")
+   else()
+-    set(tgt_prefix "lib/")
++    set(tgt_prefix "${CMAKE_INSTALL_LIBDIR}/")
+   endif()
+ 
+-  set(tgt_path "${CMAKE_INSTALL_PREFIX}/${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
++  set(tgt_path "${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
+   file(RELATIVE_PATH tgt_path ${POLLY_CONFIG_CMAKE_DIR} ${tgt_path})
+ 
+   if (NOT tgt_type STREQUAL "INTERFACE_LIBRARY")
+diff --git a/tools/polly/cmake/polly_macros.cmake b/tools/polly/cmake/polly_macros.cmake
+index 32bed50bb060..cca5bfff4970 100644
+--- a/tools/polly/cmake/polly_macros.cmake
++++ b/tools/polly/cmake/polly_macros.cmake
+@@ -44,8 +44,8 @@ macro(add_polly_library name)
+   if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LLVMPolly")
+     install(TARGETS ${name}
+       EXPORT LLVMExports
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++	  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   endif()
+   set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+ endmacro(add_polly_library)
+diff --git a/tools/polly/lib/External/CMakeLists.txt b/tools/polly/lib/External/CMakeLists.txt
+index 286c04fba287..07905e68f595 100644
+--- a/tools/polly/lib/External/CMakeLists.txt
++++ b/tools/polly/lib/External/CMakeLists.txt
+@@ -268,7 +268,7 @@ if (POLLY_BUNDLED_ISL)
+     install(DIRECTORY
+       ${ISL_SOURCE_DIR}/include/
+       ${ISL_BINARY_DIR}/include/
+-      DESTINATION include/polly
++      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/polly
+       FILES_MATCHING
+       PATTERN "*.h"
+       PATTERN "CMakeFiles" EXCLUDE
diff --git a/pkgs/development/compilers/llvm/5/llvm/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/5/llvm/gnu-install-dirs.patch
new file mode 100644
index 00000000000..3f6d6acb83f
--- /dev/null
+++ b/pkgs/development/compilers/llvm/5/llvm/gnu-install-dirs.patch
@@ -0,0 +1,386 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index c1e03aed4809..8b8bbb8c403e 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -279,15 +279,21 @@ if (CMAKE_BUILD_TYPE AND
+   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+ endif()
+ 
++include(GNUInstallDirs)
++
+ set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
+ 
+-set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
++set(LLVM_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE STRING
++    "Path for binary subdirectory (defaults to 'bin')")
+ mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+ 
+ set(LLVM_UTILS_INSTALL_DIR "bin" CACHE STRING
+     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
+ mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+ 
++set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
++	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
++
+ # They are used as destination of target generators.
+ set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
+ set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
+@@ -512,9 +518,9 @@ option (LLVM_ENABLE_DOXYGEN "Use doxygen to generate llvm API documentation." OF
+ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
+ option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
+ 
+-set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
++set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html"
+     CACHE STRING "Doxygen-generated HTML documentation install directory")
+-set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
++set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html"
+     CACHE STRING "OCamldoc-generated HTML documentation install directory")
+ 
+ option (LLVM_BUILD_EXTERNAL_COMPILER_RT
+@@ -945,7 +951,7 @@ add_subdirectory(cmake/modules)
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/llvm include/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -957,7 +963,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
+index 1c922651b133..d555fd627a4f 100644
+--- a/cmake/modules/AddLLVM.cmake
++++ b/cmake/modules/AddLLVM.cmake
+@@ -589,11 +589,11 @@ macro(add_llvm_library name)
+   else()
+     if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LTO" OR
+         (LLVM_LINK_LLVM_DYLIB AND ${name} STREQUAL "LLVM"))
+-      set(install_dir lib${LLVM_LIBDIR_SUFFIX})
++      set(install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+       if(ARG_SHARED OR BUILD_SHARED_LIBS)
+         if(WIN32 OR CYGWIN OR MINGW)
+           set(install_type RUNTIME)
+-          set(install_dir bin)
++          set(install_dir ${CMAKE_INSTALL_BINDIR})
+         else()
+           set(install_type LIBRARY)
+         endif()
+@@ -637,9 +637,9 @@ macro(add_llvm_loadable_module name)
+       if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+         if(WIN32 OR CYGWIN)
+           # DLL platform
+-          set(dlldir "bin")
++          set(dlldir "${CMAKE_INSTALL_BINDIR}")
+         else()
+-          set(dlldir "lib${LLVM_LIBDIR_SUFFIX}")
++          set(dlldir "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+         endif()
+ 
+         if(${name} IN_LIST LLVM_DISTRIBUTION_COMPONENTS OR
+@@ -651,7 +651,7 @@ macro(add_llvm_loadable_module name)
+         install(TARGETS ${name}
+                 ${export_to_llvmexports}
+                 LIBRARY DESTINATION ${dlldir}
+-                ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++                ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+       endif()
+       set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+     endif()
+@@ -864,7 +864,7 @@ macro(add_llvm_example name)
+   endif()
+   add_llvm_executable(${name} ${ARGN})
+   if( LLVM_BUILD_EXAMPLES )
+-    install(TARGETS ${name} RUNTIME DESTINATION examples)
++    install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   endif()
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endmacro(add_llvm_example name)
+@@ -1275,7 +1275,7 @@ function(llvm_install_library_symlink name dest type)
+   set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
+   set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
+ 
+-  set(output_dir lib${LLVM_LIBDIR_SUFFIX})
++  set(output_dir ${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   if(WIN32 AND "${type}" STREQUAL "SHARED")
+     set(output_dir bin)
+   endif()
+@@ -1293,7 +1293,7 @@ function(llvm_install_library_symlink name dest type)
+   endif()
+ endfunction()
+ 
+-function(llvm_install_symlink name dest)
++function(llvm_install_symlink name dest output_dir)
+   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
+   foreach(path ${CMAKE_MODULE_PATH})
+     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
+@@ -1316,7 +1316,7 @@ function(llvm_install_symlink name dest)
+   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
+ 
+   install(SCRIPT ${INSTALL_SYMLINK}
+-          CODE "install_symlink(${full_name} ${full_dest} ${LLVM_TOOLS_INSTALL_DIR})"
++          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+           COMPONENT ${component})
+ 
+   if (NOT CMAKE_CONFIGURATION_TYPES AND NOT ARG_ALWAYS_GENERATE)
+@@ -1400,7 +1400,8 @@ function(add_llvm_tool_symlink link_name target)
+     endif()
+ 
+     if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
+-      llvm_install_symlink(${link_name} ${target})
++      GNUInstallDirs_get_absolute_install_dir(output_dir LLVM_TOOLS_INSTALL_DIR)
++      llvm_install_symlink(${link_name} ${target} ${output_dir})
+     endif()
+   endif()
+ endfunction()
+@@ -1452,9 +1453,9 @@ function(llvm_setup_rpath name)
+ 
+   if (APPLE)
+     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
+-    set(_install_rpath "@loader_path/../lib" ${extra_libdir})
++    set(_install_rpath "@loader_path/../${CMAKE_INSTALL_LIBDIR}" ${extra_libdir})
+   elseif(UNIX)
+-    set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
+       set_property(TARGET ${name} APPEND_STRING PROPERTY
+                    LINK_FLAGS " -Wl,-z,origin ")
+diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
+index 1d8094cc505f..afdbe6e6d19c 100644
+--- a/cmake/modules/AddOCaml.cmake
++++ b/cmake/modules/AddOCaml.cmake
+@@ -140,9 +140,9 @@ function(add_ocaml_library name)
+   endforeach()
+ 
+   if( APPLE )
+-    set(ocaml_rpath "@executable_path/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "@executable_path/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   elseif( UNIX )
+-    set(ocaml_rpath "\\$ORIGIN/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "\\$ORIGIN/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   endif()
+   list(APPEND ocaml_flags "-ldopt" "-Wl,-rpath,${ocaml_rpath}")
+ 
+diff --git a/cmake/modules/AddSphinxTarget.cmake b/cmake/modules/AddSphinxTarget.cmake
+index 4540c5c36c8e..4cefb17fbd55 100644
+--- a/cmake/modules/AddSphinxTarget.cmake
++++ b/cmake/modules/AddSphinxTarget.cmake
+@@ -73,7 +73,7 @@ function (add_sphinx_target builder project)
+ 
+       elseif (builder STREQUAL html)
+         string(TOUPPER "${project}" project_upper)
+-        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
++        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/html"
+             CACHE STRING "HTML documentation install directory for ${project}")
+ 
+         # '/.' indicates: copy the contents of the directory directly into
+diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
+index ac4b0b7c0304..21a6a3da8667 100644
+--- a/cmake/modules/CMakeLists.txt
++++ b/cmake/modules/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
++set(LLVM_INSTALL_PACKAGE_DIR ${LLVM_INSTALL_CMAKE_DIR} CACHE STRING "Path for CMake subdirectory (defaults to 'cmake/llvm')")
+ set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+ 
+ # First for users who use an installed LLVM, create the LLVMExports.cmake file.
+@@ -84,11 +84,11 @@ foreach(p ${_count})
+   set(LLVM_CONFIG_CODE "${LLVM_CONFIG_CODE}
+ get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
+ endforeach(p)
+-set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
+-set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
++set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
++set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
+ set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
+ set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
+-set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/bin")
++set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}")
+ set(LLVM_CONFIG_EXPORTS_FILE "\${LLVM_CMAKE_DIR}/LLVMExports.cmake")
+ set(LLVM_CONFIG_EXPORTS "${LLVM_EXPORTS}")
+ configure_file(
+diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
+index 482697b06baf..af2ac1e6c979 100644
+--- a/cmake/modules/LLVMInstallSymlink.cmake
++++ b/cmake/modules/LLVMInstallSymlink.cmake
+@@ -10,7 +10,7 @@ function(install_symlink name target outdir)
+     set(LINK_OR_COPY copy)
+   endif()
+ 
+-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
++  set(bindir "${DESTDIR}${outdir}/")
+ 
+   message("Creating ${name}")
+ 
+diff --git a/docs/CMake.rst b/docs/CMake.rst
+index b6ebf37adc92..34c73d2869e0 100644
+--- a/docs/CMake.rst
++++ b/docs/CMake.rst
+@@ -196,7 +196,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
+ **LLVM_LIBDIR_SUFFIX**:STRING
+   Extra suffix to append to the directory where libraries are to be
+   installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
+-  to install libraries to ``/usr/lib64``.
++  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
+ 
+ **CMAKE_C_FLAGS**:STRING
+   Extra flags to use when compiling C source files.
+@@ -461,8 +461,8 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
+   The path to install Doxygen-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/doxygen-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
+ 
+ **LLVM_ENABLE_SPHINX**:BOOL
+   If specified, CMake will search for the ``sphinx-build`` executable and will make
+@@ -493,13 +493,33 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_SPHINX_HTML_DIR**:STRING
+   The path to install Sphinx-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/html`.
+ 
+ **LLVM_INSTALL_OCAMLDOC_HTML_DIR**:STRING
+   The path to install OCamldoc-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/ocaml-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html`.
++
++**CMAKE_INSTALL_BINDIR**:STRING
++  The path to install binary tools, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `bin`.
++
++**CMAKE_INSTALL_LIBDIR**:STRING
++  The path to install libraries, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `lib`.
++
++**CMAKE_INSTALL_INCLUDEDIR**:STRING
++  The path to install header files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `include`.
++
++**CMAKE_INSTALL_DOCDIR**:STRING
++  The path to install documentation, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/doc`.
++
++**CMAKE_INSTALL_MANDIR**:STRING
++  The path to install manpage files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/man`.
+ 
+ **LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
+   OS X Only: If enabled CMake will generate a target named
+@@ -651,9 +671,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
+ 
+ This file is available in two different locations.
+ 
+-* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
+-  ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
+-  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
++* ``<LLVM_INSTALL_PACKAGE_DIR>LLVMConfig.cmake`` where
++  ``<LLVM_INSTALL_PACKAGE_DIR>`` is the location where LLVM CMake modules are
++  installed as part of an installed version of LLVM. This is typically
++  ``cmake/llvm/`` within the lib directory. On Linux, this is typically
++  ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
+ 
+ * ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
+   ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
+diff --git a/include/llvm/CMakeLists.txt b/include/llvm/CMakeLists.txt
+index 1d5ca3ba92b0..026f5453c1da 100644
+--- a/include/llvm/CMakeLists.txt
++++ b/include/llvm/CMakeLists.txt
+@@ -4,5 +4,5 @@ add_subdirectory(Support)
+ # If we're doing an out-of-tree build, copy a module map for generated
+ # header files into the build area.
+ if (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+-  configure_file(module.modulemap.build module.modulemap COPYONLY)
++  configure_file(module.modulemap.build ${LLVM_INCLUDE_DIR}/module.modulemap COPYONLY)
+ endif (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
+index f201e1f7bff0..4582ed556a02 100644
+--- a/tools/llvm-config/BuildVariables.inc.in
++++ b/tools/llvm-config/BuildVariables.inc.in
+@@ -24,6 +24,10 @@
+ #define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
+ #define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
+ #define LLVM_LIBDIR_SUFFIX "@LLVM_LIBDIR_SUFFIX@"
++#define LLVM_INSTALL_BINDIR "@CMAKE_INSTALL_BINDIR@"
++#define LLVM_INSTALL_LIBDIR "@CMAKE_INSTALL_LIBDIR@"
++#define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
++#define LLVM_INSTALL_CMAKEDIR "@LLVM_INSTALL_CMAKE_DIR@"
+ #define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
+ #define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
+ #define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
+diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
+index 08b096afb052..2deae0dcfacc 100644
+--- a/tools/llvm-config/llvm-config.cpp
++++ b/tools/llvm-config/llvm-config.cpp
+@@ -332,12 +332,26 @@ int main(int argc, char **argv) {
+         ("-I" + ActiveIncludeDir + " " + "-I" + ActiveObjRoot + "/include");
+   } else {
+     ActivePrefix = CurrentExecPrefix;
+-    ActiveIncludeDir = ActivePrefix + "/include";
+-    SmallString<256> path(StringRef(LLVM_TOOLS_INSTALL_DIR));
+-    sys::fs::make_absolute(ActivePrefix, path);
+-    ActiveBinDir = path.str();
+-    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
+-    ActiveCMakeDir = ActiveLibDir + "/cmake/llvm";
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_INCLUDEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveIncludeDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_BINDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveBinDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveLibDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_CMAKEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveCMakeDir = std::string(path.str());
++    }
+     ActiveIncludeOption = "-I" + ActiveIncludeDir;
+   }
+ 
+diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
+index 6e913519a809..85641eef721f 100644
+--- a/tools/lto/CMakeLists.txt
++++ b/tools/lto/CMakeLists.txt
+@@ -19,7 +19,7 @@ set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/lto.exports)
+ add_llvm_library(LTO SHARED ${SOURCES} DEPENDS intrinsics_gen)
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/lto.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT LTO)
+ 
+ if (APPLE)
+diff --git a/tools/opt-viewer/CMakeLists.txt b/tools/opt-viewer/CMakeLists.txt
+index 19b606933082..27b9f71b3d79 100644
+--- a/tools/opt-viewer/CMakeLists.txt
++++ b/tools/opt-viewer/CMakeLists.txt
+@@ -8,6 +8,6 @@ set (files
+ 
+ foreach (file ${files})
+   install(PROGRAMS ${file}
+-    DESTINATION share/opt-viewer
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/opt-viewer
+     COMPONENT opt-viewer)
+ endforeach (file)
diff --git a/pkgs/development/compilers/llvm/6/clang/default.nix b/pkgs/development/compilers/llvm/6/clang/default.nix
index 41202dd3f5d..5c4894af9da 100644
--- a/pkgs/development/compilers/llvm/6/clang/default.nix
+++ b/pkgs/development/compilers/llvm/6/clang/default.nix
@@ -1,4 +1,5 @@
-{ lib, stdenv, fetch, cmake, libxml2, llvm, version, clang-tools-extra_src, python3
+{ lib, stdenv, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+, buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
 }:
@@ -22,20 +23,27 @@ let
       ++ lib.optional enableManpages python3.pkgs.sphinx
       ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-    buildInputs = [ libxml2 llvm ];
+    buildInputs = [ libxml2 libllvm ];
 
     cmakeFlags = [
       "-DCMAKE_CXX_FLAGS=-std=c++11"
       "-DLLVM_ENABLE_RTTI=ON"
+      "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
     ] ++ lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"
       "-DSPHINX_OUTPUT_MAN=ON"
       "-DSPHINX_OUTPUT_HTML=OFF"
       "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
     ];
 
-    patches = [ ./purity.patch ];
+    patches = [
+      ./purity.patch
+      ./gnu-install-dirs.patch
+    ];
 
     postPatch = ''
       sed -i -e 's/DriverArgs.hasArg(options::OPT_nostdlibinc)/true/' \
@@ -48,12 +56,12 @@ let
       sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
     '';
 
-    outputs = [ "out" "lib" "python" ];
+    outputs = [ "out" "lib" "dev" "python" ];
 
     # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${llvm}/lib/LLVMgold.so ]; then
-        ln -sv ${llvm}/lib/LLVMgold.so $out/lib
+      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
+        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
       fi
 
       ln -sv $out/bin/clang $out/bin/cpp
@@ -70,11 +78,14 @@ let
       fi
       mv $out/share/clang/*.py $python/share/clang
       rm $out/bin/c-index-test
+
+      mkdir -p $dev/bin
+      cp bin/clang-tblgen $dev/bin
     '';
 
     passthru = {
       isClang = true;
-      inherit llvm;
+      inherit libllvm;
     };
 
     meta = {
diff --git a/pkgs/development/compilers/llvm/6/clang/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/6/clang/gnu-install-dirs.patch
new file mode 100644
index 00000000000..bdbbae95516
--- /dev/null
+++ b/pkgs/development/compilers/llvm/6/clang/gnu-install-dirs.patch
@@ -0,0 +1,258 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 2eee8e6148f7..63efc7d2fdd0 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -5,6 +5,8 @@ cmake_minimum_required(VERSION 3.4.3)
+ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
+   project(Clang)
+ 
++  include(GNUInstallDirs)
++
+   # Rely on llvm-config.
+   set(CONFIG_OUTPUT)
+   find_program(LLVM_CONFIG "llvm-config")
+@@ -365,7 +367,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/clang include/clang-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.def"
+     PATTERN "*.h"
+@@ -374,7 +376,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "CMakeFiles" EXCLUDE
+     PATTERN "*.inc"
+@@ -382,7 +384,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(PROGRAMS utils/bash-autocomplete.sh
+-    DESTINATION share/clang
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+     )
+ endif()
+ 
+diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
+index c09a8423f9f6..39f37e0097eb 100644
+--- a/cmake/modules/AddClang.cmake
++++ b/cmake/modules/AddClang.cmake
+@@ -99,9 +99,9 @@ macro(add_clang_library name)
+       install(TARGETS ${name}
+         COMPONENT ${name}
+         ${export_to_clangtargets}
+-        LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        RUNTIME DESTINATION bin)
++        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+       if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+         add_llvm_install_targets(install-${name}
+@@ -141,7 +141,7 @@ macro(add_clang_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_clangtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -156,5 +156,5 @@ endmacro()
+ macro(add_clang_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
+index 97ba3edea1c5..9d2bc5714af5 100644
+--- a/lib/Headers/CMakeLists.txt
++++ b/lib/Headers/CMakeLists.txt
+@@ -142,13 +142,13 @@ install(
+   FILES ${files} ${CMAKE_CURRENT_BINARY_DIR}/arm_neon.h
+   COMPONENT clang-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ install(
+   FILES ${cuda_wrapper_files}
+   COMPONENT clang-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include/cuda_wrappers)
++  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include/cuda_wrappers)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDE's.
+   add_llvm_install_targets(install-clang-headers
+diff --git a/tools/c-index-test/CMakeLists.txt b/tools/c-index-test/CMakeLists.txt
+index d38c7bb28709..c9b5499cb756 100644
+--- a/tools/c-index-test/CMakeLists.txt
++++ b/tools/c-index-test/CMakeLists.txt
+@@ -50,7 +50,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
+        "@executable_path/../../lib")
+   else()
+-    set(INSTALL_DESTINATION bin)
++    set(INSTALL_DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endif()
+ 
+   install(TARGETS c-index-test
+diff --git a/tools/clang-check/CMakeLists.txt b/tools/clang-check/CMakeLists.txt
+index c5ace26c2914..97bdfca7d896 100644
+--- a/tools/clang-check/CMakeLists.txt
++++ b/tools/clang-check/CMakeLists.txt
+@@ -20,4 +20,4 @@ target_link_libraries(clang-check
+   )
+ 
+ install(TARGETS clang-check
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-format/CMakeLists.txt b/tools/clang-format/CMakeLists.txt
+index a295e8cd0b2a..1973ff82c7f6 100644
+--- a/tools/clang-format/CMakeLists.txt
++++ b/tools/clang-format/CMakeLists.txt
+@@ -21,20 +21,20 @@ if( LLVM_LIB_FUZZING_ENGINE OR LLVM_USE_SANITIZE_COVERAGE )
+ endif()
+ 
+ install(PROGRAMS clang-format-bbedit.applescript
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-diff.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-sublime.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS git-clang-format
+-  DESTINATION bin
++  DESTINATION ${CMAKE_INSTALL_BINDIR}
+   COMPONENT clang-format)
+diff --git a/tools/clang-func-mapping/CMakeLists.txt b/tools/clang-func-mapping/CMakeLists.txt
+index ae28e28d532d..8ecb2e37a8f7 100644
+--- a/tools/clang-func-mapping/CMakeLists.txt
++++ b/tools/clang-func-mapping/CMakeLists.txt
+@@ -20,4 +20,4 @@ target_link_libraries(clang-func-mapping
+   )
+ 
+ install(TARGETS clang-func-mapping
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-offload-bundler/CMakeLists.txt b/tools/clang-offload-bundler/CMakeLists.txt
+index 8718015be76a..7a038f39622e 100644
+--- a/tools/clang-offload-bundler/CMakeLists.txt
++++ b/tools/clang-offload-bundler/CMakeLists.txt
+@@ -22,4 +22,4 @@ target_link_libraries(clang-offload-bundler
+   ${CLANG_OFFLOAD_BUNDLER_LIB_DEPS}
+   )
+ 
+-install(TARGETS clang-offload-bundler RUNTIME DESTINATION bin)
++install(TARGETS clang-offload-bundler RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-refactor/CMakeLists.txt b/tools/clang-refactor/CMakeLists.txt
+index d2029066b9b7..9bc152a675af 100644
+--- a/tools/clang-refactor/CMakeLists.txt
++++ b/tools/clang-refactor/CMakeLists.txt
+@@ -21,4 +21,4 @@ target_link_libraries(clang-refactor
+   clangToolingRefactor
+   )
+ 
+-install(TARGETS clang-refactor RUNTIME DESTINATION bin)
++install(TARGETS clang-refactor RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-rename/CMakeLists.txt b/tools/clang-rename/CMakeLists.txt
+index 9689e1c6804d..6087716510a9 100644
+--- a/tools/clang-rename/CMakeLists.txt
++++ b/tools/clang-rename/CMakeLists.txt
+@@ -16,8 +16,8 @@ target_link_libraries(clang-rename
+   )
+ 
+ install(PROGRAMS clang-rename.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+ install(PROGRAMS clang-rename.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
+index 44406378207b..3b64b18ad4a5 100644
+--- a/tools/libclang/CMakeLists.txt
++++ b/tools/libclang/CMakeLists.txt
+@@ -130,7 +130,7 @@ endif()
+ if(INTERNAL_INSTALL_PREFIX)
+   set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
+ else()
+-  set(LIBCLANG_HEADERS_INSTALL_DESTINATION include)
++  set(LIBCLANG_HEADERS_INSTALL_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+ endif()
+ 
+ install(DIRECTORY ../../include/clang-c
+diff --git a/tools/scan-build/CMakeLists.txt b/tools/scan-build/CMakeLists.txt
+index 380379300b09..adfd58ed5f7d 100644
+--- a/tools/scan-build/CMakeLists.txt
++++ b/tools/scan-build/CMakeLists.txt
+@@ -41,7 +41,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/bin/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
++    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endforeach()
+ 
+   foreach(LibexecFile ${LibexecFiles})
+@@ -53,7 +53,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/libexec/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libexec/${LibexecFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/libexec/${LibexecFile})
+-    install(PROGRAMS libexec/${LibexecFile} DESTINATION libexec)
++    install(PROGRAMS libexec/${LibexecFile} DESTINATION ${CMAKE_INSTALL_LIBEXECDIR})
+   endforeach()
+ 
+   foreach(ManPage ${ManPages})
+@@ -77,7 +77,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/share/scan-build/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/scan-build/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-build/${ShareFile})
+-    install(FILES share/scan-build/${ShareFile} DESTINATION share/scan-build)
++    install(FILES share/scan-build/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-build)
+   endforeach()
+ 
+   add_custom_target(scan-build ALL DEPENDS ${Depends})
+diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
+index b305ca562a72..554bcb379061 100644
+--- a/tools/scan-view/CMakeLists.txt
++++ b/tools/scan-view/CMakeLists.txt
+@@ -21,7 +21,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                          ${CMAKE_BINARY_DIR}/bin/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
++    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endforeach()
+ 
+   foreach(ShareFile ${ShareFiles})
+@@ -33,7 +33,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                          ${CMAKE_BINARY_DIR}/share/scan-view/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-view/${ShareFile})
+-    install(FILES share/${ShareFile} DESTINATION share/scan-view)
++    install(FILES share/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-view)
+   endforeach()
+ 
+   add_custom_target(scan-view ALL DEPENDS ${Depends})
diff --git a/pkgs/development/compilers/llvm/6/compiler-rt/default.nix b/pkgs/development/compilers/llvm/6/compiler-rt/default.nix
index f0a1c7ecc34..384305f5cf2 100644
--- a/pkgs/development/compilers/llvm/6/compiler-rt/default.nix
+++ b/pkgs/development/compilers/llvm/6/compiler-rt/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation {
   inherit version;
   src = fetch "compiler-rt" "1fcr3jn24yr8lh36nc0c4ikli4744i2q9m1ik67p1jymwwaixkgl";
 
-  nativeBuildInputs = [ cmake python3 llvm ];
+  nativeBuildInputs = [ cmake python3 llvm.dev ];
   buildInputs = lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
   NIX_CFLAGS_COMPILE = [
@@ -54,6 +54,7 @@ stdenv.mkDerivation {
     ./codesign.patch # Revert compiler-rt commit that makes codesign mandatory
     # https://github.com/llvm/llvm-project/commit/947f9692440836dcb8d88b74b69dd379d85974ce
     ../../common/compiler-rt/glibc.patch
+    ./gnu-install-dirs.patch
   ] ++ lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
     ++ lib.optional stdenv.hostPlatform.isAarch32 ./armv7l.patch;
 
diff --git a/pkgs/development/compilers/llvm/6/compiler-rt/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/6/compiler-rt/gnu-install-dirs.patch
new file mode 100644
index 00000000000..8daf03994b5
--- /dev/null
+++ b/pkgs/development/compilers/llvm/6/compiler-rt/gnu-install-dirs.patch
@@ -0,0 +1,107 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 4b953b212829..a10b69aa67dc 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -8,6 +8,7 @@ cmake_minimum_required(VERSION 3.4.3)
+ # Check if compiler-rt is built as a standalone project.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR COMPILER_RT_STANDALONE_BUILD)
+   project(CompilerRT C CXX ASM)
++  include(GNUInstallDirs)
+   set(COMPILER_RT_STANDALONE_BUILD TRUE)
+ endif()
+ 
+diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake
+index 139b6140011c..502354a37d67 100644
+--- a/cmake/Modules/AddCompilerRT.cmake
++++ b/cmake/Modules/AddCompilerRT.cmake
+@@ -439,7 +439,7 @@ macro(add_compiler_rt_resource_file target_name file_name component)
+   add_custom_target(${target_name} DEPENDS ${dst_file})
+   # Install in Clang resource directory.
+   install(FILES ${file_name}
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_PREFIX}
+     COMPONENT ${component})
+   add_dependencies(${component} ${target_name})
+ 
+@@ -456,7 +456,7 @@ macro(add_compiler_rt_script name)
+   add_custom_target(${name} DEPENDS ${dst})
+   install(FILES ${dst}
+     PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/bin)
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_BINDIR})
+ endmacro(add_compiler_rt_script src name)
+ 
+ # Builds custom version of libc++ and installs it in <prefix>.
+diff --git a/cmake/Modules/CompilerRTDarwinUtils.cmake b/cmake/Modules/CompilerRTDarwinUtils.cmake
+index a25540bf46d1..77ea739fea74 100644
+--- a/cmake/Modules/CompilerRTDarwinUtils.cmake
++++ b/cmake/Modules/CompilerRTDarwinUtils.cmake
+@@ -375,7 +375,7 @@ macro(darwin_add_embedded_builtin_libraries)
+     set(DARWIN_macho_embedded_LIBRARY_OUTPUT_DIR
+       ${COMPILER_RT_OUTPUT_DIR}/lib/macho_embedded)
+     set(DARWIN_macho_embedded_LIBRARY_INSTALL_DIR
+-      ${COMPILER_RT_INSTALL_PATH}/lib/macho_embedded)
++      ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/macho_embedded)
+       
+     set(CFLAGS_armv7 "-target thumbv7-apple-darwin-eabi")
+     set(CFLAGS_i386 "-march=pentium")
+diff --git a/cmake/base-config-ix.cmake b/cmake/base-config-ix.cmake
+index b208f0852408..cacf4e8fb69d 100644
+--- a/cmake/base-config-ix.cmake
++++ b/cmake/base-config-ix.cmake
+@@ -46,11 +46,11 @@ if (LLVM_TREE_AVAILABLE)
+ else()
+     # Take output dir and install path from the user.
+   set(COMPILER_RT_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH
+-    "Path where built compiler-rt libraries should be stored.")
++    "Path where built compiler-rt build artifacts should be stored.")
+   set(COMPILER_RT_EXEC_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/bin CACHE PATH
+     "Path where built compiler-rt executables should be stored.")
+-  set(COMPILER_RT_INSTALL_PATH ${CMAKE_INSTALL_PREFIX} CACHE PATH
+-    "Path where built compiler-rt libraries should be installed.")
++  set(COMPILER_RT_INSTALL_PATH "" CACHE PATH
++    "Prefix where built compiler-rt artifacts should be installed, comes before CMAKE_INSTALL_PREFIX.")
+   option(COMPILER_RT_INCLUDE_TESTS "Generate and build compiler-rt unit tests." OFF)
+   option(COMPILER_RT_ENABLE_WERROR "Fail and stop if warning is triggered" OFF)
+   # Use a host compiler to compile/link tests.
+@@ -70,9 +70,9 @@ if(NOT DEFINED COMPILER_RT_OS_DIR)
+   string(TOLOWER ${CMAKE_SYSTEM_NAME} COMPILER_RT_OS_DIR)
+ endif()
+ set(COMPILER_RT_LIBRARY_OUTPUT_DIR
+-  ${COMPILER_RT_OUTPUT_DIR}/lib/${COMPILER_RT_OS_DIR})
++  ${COMPILER_RT_OUTPUT_DIR}/${CMAKE_INSTALL_FULL_LIBDIR}/${COMPILER_RT_OS_DIR})
+ set(COMPILER_RT_LIBRARY_INSTALL_DIR
+-  ${COMPILER_RT_INSTALL_PATH}/lib/${COMPILER_RT_OS_DIR})
++  ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${COMPILER_RT_OS_DIR})
+ 
+ if(APPLE)
+   # On Darwin if /usr/include doesn't exist, the user probably has Xcode but not
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index f7efb102ab63..ab8a94d9ff40 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -47,12 +47,12 @@ set_target_properties(compiler-rt-headers PROPERTIES FOLDER "Compiler-RT Misc")
+ install(FILES ${SANITIZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/sanitizer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/sanitizer)
+ # Install xray headers.
+ install(FILES ${XRAY_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/xray)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/xray)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDEs.
+   add_custom_target(install-compiler-rt-headers
+diff --git a/lib/dfsan/CMakeLists.txt b/lib/dfsan/CMakeLists.txt
+index 2c486bff821b..0ee715da95f8 100644
+--- a/lib/dfsan/CMakeLists.txt
++++ b/lib/dfsan/CMakeLists.txt
+@@ -44,4 +44,4 @@ add_custom_command(OUTPUT ${dfsan_abilist_filename}
+                    DEPENDS done_abilist.txt libc_ubuntu1404_abilist.txt)
+ add_dependencies(dfsan dfsan_abilist)
+ install(FILES ${dfsan_abilist_filename}
+-        DESTINATION ${COMPILER_RT_INSTALL_PATH})
++        DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_PREFIX})
diff --git a/pkgs/development/compilers/llvm/6/default.nix b/pkgs/development/compilers/llvm/6/default.nix
index 2c4c11c89bd..b78f7a62506 100644
--- a/pkgs/development/compilers/llvm/6/default.nix
+++ b/pkgs/development/compilers/llvm/6/default.nix
@@ -1,6 +1,5 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, gccForLibs
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith
-, buildPackages
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 }:
@@ -18,35 +17,44 @@ let
   clang-tools-extra_src = fetch "clang-tools-extra" "1w8ml7fyn4vyxmy59n2qm4r1k1kgwgwkaldp6m45fdv4g0kkfbhd";
 
   tools = lib.makeExtensible (tools: let
-    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch; });
+    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch buildLlvmTools; });
     mkExtraBuildCommands = cc: ''
       rsrc="$out/resource-root"
       mkdir "$rsrc"
-      ln -s "${cc}/lib/clang/${release_version}/include" "$rsrc"
+      ln -s "${cc.lib}/lib/clang/${release_version}/include" "$rsrc"
       ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
       echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
     '';
+
   in {
 
-    llvm = callPackage ./llvm { };
+    libllvm = callPackage ./llvm { };
+
+    # `llvm` historically had the binaries.  When choosing an output explicitly,
+    # we need to reintroduce `outputUnspecified` to get the expected behavior e.g. of lib.get*
+    llvm = tools.libllvm.out // { outputUnspecified = true; };
+
+    libllvm-polly = callPackage ./llvm { enablePolly = true; };
 
-    clang-unwrapped = callPackage ./clang {
+    llvm-polly = tools.libllvm-polly.lib // { outputUnspecified = true; };
+
+    libclang = callPackage ./clang {
       inherit clang-tools-extra_src;
     };
 
-    llvm-manpages = lowPrio (tools.llvm.override {
+    clang-unwrapped = tools.libclang.out // { outputUnspecified = true; };
+
+    llvm-manpages = lowPrio (tools.libllvm.override {
       enableManpages = true;
       enableSharedLibraries = false;
       python3 = pkgs.python3;  # don't use python-boot
     });
 
-    clang-manpages = lowPrio (tools.clang-unwrapped.override {
+    clang-manpages = lowPrio (tools.libclang.override {
       enableManpages = true;
       python3 = pkgs.python3;  # don't use python-boot
     });
 
-    libclang = tools.clang-unwrapped.lib;
-
     clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
 
     libstdcxxClang = wrapCCWith rec {
diff --git a/pkgs/development/compilers/llvm/6/libc++/default.nix b/pkgs/development/compilers/llvm/6/libc++/default.nix
index ac489db54fc..69314fbe2ba 100644
--- a/pkgs/development/compilers/llvm/6/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/6/libc++/default.nix
@@ -11,7 +11,11 @@ stdenv.mkDerivation {
     export LIBCXXABI_INCLUDE_DIR="$PWD/$(ls -d libcxxabi-${version}*)/include"
   '';
 
-  patches = lib.optionals stdenv.hostPlatform.isMusl [
+  outputs = [ "out" "dev" ];
+
+  patches = [
+    ./gnu-install-dirs.patch
+  ] ++ lib.optionals stdenv.hostPlatform.isMusl [
     ../../libcxx-0001-musl-hacks.patch
   ];
 
diff --git a/pkgs/development/compilers/llvm/6/libc++/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/6/libc++/gnu-install-dirs.patch
new file mode 100644
index 00000000000..33ff9ef123a
--- /dev/null
+++ b/pkgs/development/compilers/llvm/6/libc++/gnu-install-dirs.patch
@@ -0,0 +1,72 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 9e8e9d5e3d9b..e1d6d2392b92 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -22,6 +22,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   project(libcxx CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxx)
+   set(PACKAGE_VERSION 6.0.0)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+diff --git a/cmake/Modules/HandleLibCXXABI.cmake b/cmake/Modules/HandleLibCXXABI.cmake
+index 558e11ba2cc1..c6a99cec0191 100644
+--- a/cmake/Modules/HandleLibCXXABI.cmake
++++ b/cmake/Modules/HandleLibCXXABI.cmake
+@@ -55,7 +55,7 @@ macro(setup_abi_lib abidefines abilib abifiles abidirs)
+           )
+         if (LIBCXX_INSTALL_HEADERS)
+           install(FILES "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}"
+-            DESTINATION ${LIBCXX_INSTALL_PREFIX}include/c++/v1/${dstdir}
++            DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dstdir}
+             COMPONENT cxx-headers
+             PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+             )
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index b98e09260ca1..c920f48697bc 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -20,7 +20,7 @@ endif()
+ 
+ if (LIBCXX_INSTALL_HEADERS)
+   install(DIRECTORY .
+-    DESTINATION ${LIBCXX_INSTALL_PREFIX}include/c++/v1
++    DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1
+     COMPONENT cxx-headers
+     FILES_MATCHING
+     ${LIBCXX_HEADER_PATTERN}
+@@ -44,7 +44,7 @@ if (LIBCXX_INSTALL_HEADERS)
+     set(generated_config_deps generate_config_header)
+     # Install the generated header as __config.
+     install(FILES ${LIBCXX_BINARY_DIR}/__generated_config
+-      DESTINATION ${LIBCXX_INSTALL_PREFIX}include/c++/v1
++      DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+       RENAME __config
+       COMPONENT cxx-headers)
+diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
+index aa5ebf1568ec..36d85b94c3ba 100644
+--- a/lib/CMakeLists.txt
++++ b/lib/CMakeLists.txt
+@@ -357,8 +357,8 @@ if (LIBCXX_INSTALL_LIBRARY)
+     set(experimental_lib cxx_experimental)
+   endif()
+   install(TARGETS ${LIBCXX_TARGETS} ${experimental_lib}
+-    LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
+-    ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
++    LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
++    ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
+     )
+   # NOTE: This install command must go after the cxx install command otherwise
+   # it will not be executed after the library symlinks are installed.
+@@ -366,7 +366,7 @@ if (LIBCXX_INSTALL_LIBRARY)
+     # Replace the libc++ filename with $<TARGET_LINKER_FILE:cxx>
+     # after we required CMake 3.0.
+     install(FILES "${LIBCXX_LIBRARY_DIR}/libc++${CMAKE_SHARED_LIBRARY_SUFFIX}"
+-      DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX}
++      DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX}
+       COMPONENT libcxx)
+   endif()
+ endif()
diff --git a/pkgs/development/compilers/llvm/6/libc++abi/default.nix b/pkgs/development/compilers/llvm/6/libc++abi/default.nix
index c0d90f6c8e4..04054f0ba0e 100644
--- a/pkgs/development/compilers/llvm/6/libc++abi/default.nix
+++ b/pkgs/development/compilers/llvm/6/libc++abi/default.nix
@@ -6,8 +6,7 @@ stdenv.mkDerivation {
 
   src = fetch "libcxxabi" "0prqvdj317qrc8nddaq1hh2ag9algkd9wbkj3y4mr5588k12x7r0";
 
-  nativeBuildInputs = [ cmake ];
-  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD) libunwind;
+  outputs = [ "out" "dev" ];
 
   postUnpack = ''
     unpackFile ${libcxx.src}
@@ -19,6 +18,13 @@ stdenv.mkDerivation {
     patch -p1 -d $(ls -d libcxx-*) -i ${../../libcxx-0001-musl-hacks.patch}
   '';
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD) libunwind;
+
   installPhase = if stdenv.isDarwin
     then ''
       for file in lib/*.dylib; do
diff --git a/pkgs/development/compilers/llvm/6/libc++abi/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/6/libc++abi/gnu-install-dirs.patch
new file mode 100644
index 00000000000..649d28d6c45
--- /dev/null
+++ b/pkgs/development/compilers/llvm/6/libc++abi/gnu-install-dirs.patch
@@ -0,0 +1,28 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 1adbdb338322..2978631e1c58 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -20,6 +20,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   project(libcxxabi CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxxabi)
+   set(PACKAGE_VERSION 6.0.0)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index 240f6d0d103b..7ad5c31ec7b4 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -181,8 +181,8 @@ add_custom_target(cxxabi DEPENDS ${LIBCXXABI_TARGETS})
+ 
+ if (LIBCXXABI_INSTALL_LIBRARY)
+   install(TARGETS ${LIBCXXABI_TARGETS}
+-    LIBRARY DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
+-    ARCHIVE DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
++    LIBRARY DESTINATION ${LIBCXXABI_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
++    ARCHIVE DESTINATION ${LIBCXXABI_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
+     )
+ endif()
+ 
diff --git a/pkgs/development/compilers/llvm/6/lld/default.nix b/pkgs/development/compilers/llvm/6/lld/default.nix
index b8038524805..5bfd5f60e92 100644
--- a/pkgs/development/compilers/llvm/6/lld/default.nix
+++ b/pkgs/development/compilers/llvm/6/lld/default.nix
@@ -1,8 +1,9 @@
 { lib, stdenv
+, buildLlvmTools
 , fetch
 , cmake
 , libxml2
-, llvm
+, libllvm
 , version
 }:
 
@@ -12,15 +13,20 @@ stdenv.mkDerivation {
 
   src = fetch "lld" "04afcfq2h7ysyqxxhyhb7ig4p0vdw7mi63kh8mffl74j0rc781p7";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ llvm libxml2 ];
+  buildInputs = [ libllvm libxml2 ];
 
-  outputs = [ "out" "dev" ];
+  cmakeFlags = [
+    "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
+  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+  ];
 
-  postInstall = ''
-    moveToOutput include "$dev"
-    moveToOutput lib "$dev"
-  '';
+  outputs = [ "out" "lib" "dev" ];
 
   meta = {
     description = "The LLVM Linker";
diff --git a/pkgs/development/compilers/llvm/6/lld/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/6/lld/gnu-install-dirs.patch
new file mode 100644
index 00000000000..8c6886c6890
--- /dev/null
+++ b/pkgs/development/compilers/llvm/6/lld/gnu-install-dirs.patch
@@ -0,0 +1,68 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index e2fbdbfbbb47..d601b231ebb8 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -6,6 +6,8 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   set(CMAKE_INCLUDE_CURRENT_DIR ON)
+   set(LLD_BUILT_STANDALONE TRUE)
+ 
++  include(GNUInstallDirs)
++
+   find_program(LLVM_CONFIG_PATH "llvm-config" DOC "Path to llvm-config binary")
+   if(NOT LLVM_CONFIG_PATH)
+     message(FATAL_ERROR "llvm-config not found: specify LLVM_CONFIG_PATH")
+@@ -203,7 +205,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/cmake/modules/AddLLD.cmake b/cmake/modules/AddLLD.cmake
+index 0d951799cdfe..7d8546ba87f8 100644
+--- a/cmake/modules/AddLLD.cmake
++++ b/cmake/modules/AddLLD.cmake
+@@ -20,9 +20,9 @@ macro(add_lld_library name)
+     install(TARGETS ${name}
+       COMPONENT ${name}
+       ${export_to_lldtargets}
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      RUNTIME DESTINATION bin)
++      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+     if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+       add_llvm_install_targets(install-${name}
+@@ -54,7 +54,7 @@ macro(add_lld_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_lldtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -69,5 +69,5 @@ endmacro()
+ macro(add_lld_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/tools/lld/CMakeLists.txt b/tools/lld/CMakeLists.txt
+index d8829493fc22..df748a0e749b 100644
+--- a/tools/lld/CMakeLists.txt
++++ b/tools/lld/CMakeLists.txt
+@@ -16,7 +16,7 @@ target_link_libraries(lld
+   )
+ 
+ install(TARGETS lld
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ if(NOT LLD_SYMLINKS_TO_CREATE)
+   set(LLD_SYMLINKS_TO_CREATE lld-link ld.lld ld64.lld wasm-ld)
diff --git a/pkgs/development/compilers/llvm/6/lldb/default.nix b/pkgs/development/compilers/llvm/6/lldb/default.nix
index 7c6f8b1bd97..31cc0ca68d7 100644
--- a/pkgs/development/compilers/llvm/6/lldb/default.nix
+++ b/pkgs/development/compilers/llvm/6/lldb/default.nix
@@ -8,14 +8,14 @@
 , which
 , libedit
 , libxml2
-, llvm
-, clang-unwrapped
+, libllvm
+, libclang
 , python3
 , version
 , darwin
 }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "lldb";
   inherit version;
 
@@ -28,29 +28,46 @@ stdenv.mkDerivation {
       sha256 = "1zbx4m0m8kbg0wq6740jcw151vb2pb1p25p401wiq8diqqagkjps";
       stripLen = 1;
     })
+    ./gnu-install-dirs.patch
   ];
 
   postPatch = ''
     # Fix up various paths that assume llvm and clang are installed in the same place
-    sed -i 's,".*ClangConfig.cmake","${clang-unwrapped}/lib/cmake/clang/ClangConfig.cmake",' \
+    sed -i 's,".*ClangConfig.cmake","${libclang.dev}/lib/cmake/clang/ClangConfig.cmake",' \
       cmake/modules/LLDBStandalone.cmake
-    sed -i 's,".*tools/clang/include","${clang-unwrapped}/include",' \
+    sed -i 's,".*tools/clang/include","${libclang.dev}/include",' \
       cmake/modules/LLDBStandalone.cmake
-    sed -i 's,"$.LLVM_LIBRARY_DIR.",${llvm}/lib ${clang-unwrapped}/lib,' \
+    sed -i 's,"$.LLVM_LIBRARY_DIR.",${libllvm.lib}/lib ${libclang.lib}/lib,' \
       cmake/modules/LLDBStandalone.cmake
   '';
 
-  nativeBuildInputs = [ cmake python3 which swig ];
-  buildInputs = [ ncurses zlib libedit libxml2 llvm ]
-    ++ lib.optionals stdenv.isDarwin [ darwin.libobjc darwin.apple_sdk.libs.xpc darwin.apple_sdk.frameworks.Foundation darwin.bootstrap_cmds darwin.apple_sdk.frameworks.Carbon darwin.apple_sdk.frameworks.Cocoa ];
+  outputs = [ "out" "lib" "dev" ];
+
+  nativeBuildInputs = [
+    cmake python3 which swig
+  ];
+
+  buildInputs = [
+    ncurses zlib libedit libxml2 libllvm
+  ] ++ lib.optionals stdenv.isDarwin [
+    darwin.libobjc
+    darwin.apple_sdk.libs.xpc
+    darwin.apple_sdk.frameworks.Foundation darwin.bootstrap_cmds darwin.apple_sdk.frameworks.Carbon darwin.apple_sdk.frameworks.Cocoa
+  ];
 
   CXXFLAGS = "-fno-rtti";
   hardeningDisable = [ "format" ];
 
   cmakeFlags = [
+    "-DLLDB_INCLUDE_TESTS=${if doCheck then "YES" else "NO"}"
     "-DLLDB_CODESIGN_IDENTITY=" # codesigning makes nondeterministic
+  ] ++ lib.optionals doCheck [
+    "-DLLDB_TEST_C_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
+    "-DLLDB_TEST_CXX_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++"
   ];
 
+  doCheck = false;
+
   postInstall = ''
     mkdir -p $out/share/man/man1
     cp ../docs/lldb.1 $out/share/man/man1/
diff --git a/pkgs/development/compilers/llvm/6/lldb/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/6/lldb/gnu-install-dirs.patch
new file mode 100644
index 00000000000..a240ecaab17
--- /dev/null
+++ b/pkgs/development/compilers/llvm/6/lldb/gnu-install-dirs.patch
@@ -0,0 +1,76 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index c6b082e104e5..568a99837e1f 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -7,6 +7,8 @@ set(CMAKE_MODULE_PATH
+   "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules"
+   )
+ 
++include(GNUInstallDirs)
++
+ include(LLDBStandalone)
+ include(LLDBConfig)
+ include(AddLLDB)
+diff --git a/cmake/modules/AddLLDB.cmake b/cmake/modules/AddLLDB.cmake
+index 2fd8b384d9e3..4db5e786c493 100644
+--- a/cmake/modules/AddLLDB.cmake
++++ b/cmake/modules/AddLLDB.cmake
+@@ -56,14 +56,14 @@ function(add_lldb_library name)
+         endif()
+         install(TARGETS ${name}
+           COMPONENT ${name}
+-          RUNTIME DESTINATION bin
++          RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+           LIBRARY DESTINATION ${out_dir}
+           ARCHIVE DESTINATION ${out_dir})
+       else()
+         install(TARGETS ${name}
+           COMPONENT ${name}
+-          LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-          ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++          LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++          ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+       endif()
+       if (NOT CMAKE_CONFIGURATION_TYPES)
+         add_llvm_install_targets(install-${name}
+@@ -132,7 +132,7 @@ function(add_lldb_executable name)
+   if(ARG_GENERATE_INSTALL AND NOT (ARG_INCLUDE_IN_FRAMEWORK AND LLDB_BUILD_FRAMEWORK ))
+     install(TARGETS ${name}
+           COMPONENT ${name}
+-          RUNTIME DESTINATION bin)
++          RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+     if (NOT CMAKE_CONFIGURATION_TYPES)
+       add_llvm_install_targets(install-${name}
+                                DEPENDS ${name}
+diff --git a/cmake/modules/LLDBConfig.cmake b/cmake/modules/LLDBConfig.cmake
+index 24878b5913f3..b9d27788bb87 100644
+--- a/cmake/modules/LLDBConfig.cmake
++++ b/cmake/modules/LLDBConfig.cmake
+@@ -278,7 +278,7 @@ include_directories(BEFORE
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+@@ -288,7 +288,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/tools/intel-features/CMakeLists.txt b/tools/intel-features/CMakeLists.txt
+index b5316540fdf3..3c3c882d503f 100644
+--- a/tools/intel-features/CMakeLists.txt
++++ b/tools/intel-features/CMakeLists.txt
+@@ -64,4 +64,4 @@ if (NOT LLDB_DISABLE_PYTHON AND LLDB_BUILD_INTEL_PT)
+ endif()
+ 
+ install(TARGETS lldbIntelFeatures
+-  LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
diff --git a/pkgs/development/compilers/llvm/6/llvm/default.nix b/pkgs/development/compilers/llvm/6/llvm/default.nix
index de99691094b..1c04a62c4d5 100644
--- a/pkgs/development/compilers/llvm/6/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/6/llvm/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv
+, pkgsBuildBuild
 , fetch
 , cmake
 , python3
@@ -9,11 +10,12 @@
 , version
 , release_version
 , zlib
-, buildPackages
+, buildLlvmTools
 , fetchpatch
 , debugVersion ? false
 , enableManpages ? false
-, enableSharedLibraries ? true
+, enableSharedLibraries ? !stdenv.hostPlatform.isStatic
+, enablePolly ? false
 }:
 
 let
@@ -30,15 +32,18 @@ stdenv.mkDerivation ({
   inherit version;
 
   src = fetch "llvm" "1qpls3vk85lydi5b4axl0809fv932qgsqgdgrk098567z4jc7mmn";
+  polly_src = fetch "polly" "1k2frwg5mkqh0raia8xf69h3jhdw7a5nxd6vjscjn44cdkgmyxp7";
 
   unpackPhase = ''
     unpackFile $src
     mv llvm-${version}* llvm
     sourceRoot=$PWD/llvm
+  '' + optionalString enablePolly ''
+    unpackFile $polly_src
+    mv polly-* $sourceRoot/tools/polly
   '';
 
-  outputs = [ "out" "python" ]
-    ++ optional enableSharedLibraries "lib";
+  outputs = [ "out" "lib" "dev" "python" ];
 
   nativeBuildInputs = [ cmake python3 ]
     ++ optional enableManpages python3.pkgs.sphinx;
@@ -58,12 +63,13 @@ stdenv.mkDerivation ({
       includes = [ "test/tools/gold/X86/common.ll" ];
       sha256 = "0fxgrxmfnjx17w3lcq19rk68b2xksh1bynz3ina784kma7hp4wdb";
     })
-  ];
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
 
   postPatch = optionalString stdenv.isDarwin ''
     substituteInPlace cmake/modules/AddLLVM.cmake \
       --replace 'set(_install_name_dir INSTALL_NAME_DIR "@rpath")' "set(_install_name_dir)" \
-      --replace 'set(_install_rpath "@loader_path/../lib" ''${extra_libdir})' ""
+      --replace 'set(_install_rpath "@loader_path/../''${CMAKE_INSTALL_LIBDIR}" ''${extra_libdir})' ""
   ''
   # Patch llvm-config to return correct library path based on --link-{shared,static}.
   + optionalString (enableSharedLibraries) ''
@@ -88,6 +94,7 @@ stdenv.mkDerivation ({
   '';
 
   cmakeFlags = with stdenv; [
+    "-DLLVM_INSTALL_CMAKE_DIR=${placeholder "dev"}/lib/cmake/llvm/"
     "-DCMAKE_BUILD_TYPE=${if debugVersion then "Debug" else "Release"}"
     "-DLLVM_INSTALL_UTILS=ON"  # Needed by rustc
     "-DLLVM_BUILD_TESTS=ON"
@@ -112,7 +119,20 @@ stdenv.mkDerivation ({
     "-DCAN_TARGET_i386=false"
   ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
     "-DCMAKE_CROSSCOMPILING=True"
-    "-DLLVM_TABLEGEN=${buildPackages.llvm_6}/bin/llvm-tblgen"
+    "-DLLVM_TABLEGEN=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+    (
+      let
+        nativeCC = pkgsBuildBuild.targetPackages.stdenv.cc;
+        nativeBintools = nativeCC.bintools.bintools;
+        nativeToolchainFlags = [
+          "-DCMAKE_C_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}cc"
+          "-DCMAKE_CXX_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}c++"
+          "-DCMAKE_AR=${nativeBintools}/bin/${nativeBintools.targetPrefix}ar"
+          "-DCMAKE_STRIP=${nativeBintools}/bin/${nativeBintools.targetPrefix}strip"
+          "-DCMAKE_RANLIB=${nativeBintools}/bin/${nativeBintools.targetPrefix}ranlib"
+        ];
+      in "-DCROSS_TOOLCHAIN_FLAGS_NATIVE:list=${lib.concatStringsSep ";" nativeToolchainFlags}"
+    )
   ];
 
   postBuild = ''
@@ -126,19 +146,20 @@ stdenv.mkDerivation ({
   postInstall = ''
     mkdir -p $python/share
     mv $out/share/opt-viewer $python/share/opt-viewer
-  ''
-  + optionalString enableSharedLibraries ''
-    moveToOutput "lib/libLLVM-*" "$lib"
-    moveToOutput "lib/libLLVM${stdenv.hostPlatform.extensions.sharedLibrary}" "$lib"
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM-" "$lib/lib/libLLVM-"
+    moveToOutput "bin/llvm-config*" "$dev"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
+      --replace "\''${_IMPORT_PREFIX}/lib/lib" "$lib/lib/lib" \
+      --replace "$out/bin/llvm-config" "$dev/bin/llvm-config"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMConfig.cmake" \
+      --replace 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}")' 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}'"$lib"'")'
   ''
   + optionalString (stdenv.isDarwin && enableSharedLibraries) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM.dylib" "$lib/lib/libLLVM.dylib"
     ${lib.concatMapStringsSep "\n" (v: ''
       ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${v}.dylib
     '') versionSuffixes}
+  ''
+  + optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    cp NATIVE/bin/llvm-config $dev/bin/llvm-config-native
   '';
 
   doCheck = stdenv.isLinux && (!stdenv.isi686);
diff --git a/pkgs/development/compilers/llvm/6/llvm/gnu-install-dirs-polly.patch b/pkgs/development/compilers/llvm/6/llvm/gnu-install-dirs-polly.patch
new file mode 100644
index 00000000000..b4fda24a55f
--- /dev/null
+++ b/pkgs/development/compilers/llvm/6/llvm/gnu-install-dirs-polly.patch
@@ -0,0 +1,106 @@
+diff --git a/tools/polly/CMakeLists.txt b/tools/polly/CMakeLists.txt
+index 9ddc0f7ff81d..7ca45f286d47 100644
+--- a/tools/polly/CMakeLists.txt
++++ b/tools/polly/CMakeLists.txt
+@@ -2,7 +2,11 @@
+ if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   project(Polly)
+   cmake_minimum_required(VERSION 3.4.3)
++endif()
++
++include(GNUInstallDirs)
+ 
++if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   # Where is LLVM installed?
+   find_package(LLVM CONFIG REQUIRED)
+   set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+@@ -157,14 +161,14 @@ include_directories(
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+     )
+ 
+   install(DIRECTORY ${POLLY_BINARY_DIR}/include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN "CMakeFiles" EXCLUDE
+diff --git a/tools/polly/cmake/CMakeLists.txt b/tools/polly/cmake/CMakeLists.txt
+index 969292cd6b00..d7aea77bdd20 100644
+--- a/tools/polly/cmake/CMakeLists.txt
++++ b/tools/polly/cmake/CMakeLists.txt
+@@ -79,18 +79,18 @@ file(GENERATE
+ 
+ # Generate PollyConfig.cmake for the install tree.
+ unset(POLLY_EXPORTS)
+-set(POLLY_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
++set(POLLY_INSTALL_PREFIX "")
+ set(POLLY_CONFIG_LLVM_CMAKE_DIR "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}")
++set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
++set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+ if (POLLY_BUNDLED_ISL)
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
+-    "${POLLY_INSTALL_PREFIX}/include/polly"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}/polly"
+     )
+ else()
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+     ${ISL_INCLUDE_DIRS}
+     )
+ endif()
+@@ -100,12 +100,12 @@ endif()
+ foreach(tgt IN LISTS POLLY_CONFIG_EXPORTED_TARGETS)
+   get_target_property(tgt_type ${tgt} TYPE)
+   if (tgt_type STREQUAL "EXECUTABLE")
+-    set(tgt_prefix "bin/")
++    set(tgt_prefix "${CMAKE_INSTALL_BINDIR}/")
+   else()
+-    set(tgt_prefix "lib/")
++    set(tgt_prefix "${CMAKE_INSTALL_LIBDIR}/")
+   endif()
+ 
+-  set(tgt_path "${CMAKE_INSTALL_PREFIX}/${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
++  set(tgt_path "${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
+   file(RELATIVE_PATH tgt_path ${POLLY_CONFIG_CMAKE_DIR} ${tgt_path})
+ 
+   if (NOT tgt_type STREQUAL "INTERFACE_LIBRARY")
+diff --git a/tools/polly/cmake/polly_macros.cmake b/tools/polly/cmake/polly_macros.cmake
+index 32bed50bb060..cca5bfff4970 100644
+--- a/tools/polly/cmake/polly_macros.cmake
++++ b/tools/polly/cmake/polly_macros.cmake
+@@ -44,8 +44,8 @@ macro(add_polly_library name)
+   if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LLVMPolly")
+     install(TARGETS ${name}
+       EXPORT LLVMExports
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++	  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   endif()
+   set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+ endmacro(add_polly_library)
+diff --git a/tools/polly/lib/External/CMakeLists.txt b/tools/polly/lib/External/CMakeLists.txt
+index b3c6e73a7a00..c67acf8576c7 100644
+--- a/tools/polly/lib/External/CMakeLists.txt
++++ b/tools/polly/lib/External/CMakeLists.txt
+@@ -268,7 +268,7 @@ if (POLLY_BUNDLED_ISL)
+     install(DIRECTORY
+       ${ISL_SOURCE_DIR}/include/
+       ${ISL_BINARY_DIR}/include/
+-      DESTINATION include/polly
++      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/polly
+       FILES_MATCHING
+       PATTERN "*.h"
+       PATTERN "CMakeFiles" EXCLUDE
diff --git a/pkgs/development/compilers/llvm/6/llvm/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/6/llvm/gnu-install-dirs.patch
new file mode 100644
index 00000000000..987f97210fb
--- /dev/null
+++ b/pkgs/development/compilers/llvm/6/llvm/gnu-install-dirs.patch
@@ -0,0 +1,386 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index f8da6cf92119..881e4cda4971 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -271,15 +271,21 @@ if (CMAKE_BUILD_TYPE AND
+   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+ endif()
+ 
++include(GNUInstallDirs)
++
+ set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
+ 
+-set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
++set(LLVM_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE STRING
++    "Path for binary subdirectory (defaults to 'bin')")
+ mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+ 
+ set(LLVM_UTILS_INSTALL_DIR "bin" CACHE STRING
+     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
+ mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+ 
++set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
++	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
++
+ # They are used as destination of target generators.
+ set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
+ set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
+@@ -510,9 +516,9 @@ option (LLVM_ENABLE_DOXYGEN "Use doxygen to generate llvm API documentation." OF
+ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
+ option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
+ 
+-set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
++set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html"
+     CACHE STRING "Doxygen-generated HTML documentation install directory")
+-set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
++set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html"
+     CACHE STRING "OCamldoc-generated HTML documentation install directory")
+ 
+ option (LLVM_BUILD_EXTERNAL_COMPILER_RT
+@@ -944,7 +950,7 @@ endif()
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/llvm include/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -956,7 +962,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
+index fd5627eecbb2..29e09c6f3f8a 100644
+--- a/cmake/modules/AddLLVM.cmake
++++ b/cmake/modules/AddLLVM.cmake
+@@ -621,11 +621,11 @@ macro(add_llvm_library name)
+   else()
+     if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LTO" OR
+         (LLVM_LINK_LLVM_DYLIB AND ${name} STREQUAL "LLVM"))
+-      set(install_dir lib${LLVM_LIBDIR_SUFFIX})
++      set(install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+       if(ARG_SHARED OR BUILD_SHARED_LIBS)
+         if(WIN32 OR CYGWIN OR MINGW)
+           set(install_type RUNTIME)
+-          set(install_dir bin)
++          set(install_dir ${CMAKE_INSTALL_BINDIR})
+         else()
+           set(install_type LIBRARY)
+         endif()
+@@ -667,9 +667,9 @@ macro(add_llvm_loadable_module name)
+       if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+         if(WIN32 OR CYGWIN)
+           # DLL platform
+-          set(dlldir "bin")
++          set(dlldir "${CMAKE_INSTALL_BINDIR}")
+         else()
+-          set(dlldir "lib${LLVM_LIBDIR_SUFFIX}")
++          set(dlldir "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+         endif()
+ 
+         if(${name} IN_LIST LLVM_DISTRIBUTION_COMPONENTS OR
+@@ -681,7 +681,7 @@ macro(add_llvm_loadable_module name)
+         install(TARGETS ${name}
+                 ${export_to_llvmexports}
+                 LIBRARY DESTINATION ${dlldir}
+-                ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++                ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+       endif()
+       set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+     endif()
+@@ -892,7 +892,7 @@ macro(add_llvm_example name)
+   endif()
+   add_llvm_executable(${name} ${ARGN})
+   if( LLVM_BUILD_EXAMPLES )
+-    install(TARGETS ${name} RUNTIME DESTINATION examples)
++    install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   endif()
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endmacro(add_llvm_example name)
+@@ -1410,7 +1410,7 @@ function(llvm_install_library_symlink name dest type)
+   set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
+   set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
+ 
+-  set(output_dir lib${LLVM_LIBDIR_SUFFIX})
++  set(output_dir ${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   if(WIN32 AND "${type}" STREQUAL "SHARED")
+     set(output_dir bin)
+   endif()
+@@ -1426,7 +1426,7 @@ function(llvm_install_library_symlink name dest type)
+   endif()
+ endfunction()
+ 
+-function(llvm_install_symlink name dest)
++function(llvm_install_symlink name dest output_dir)
+   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
+   foreach(path ${CMAKE_MODULE_PATH})
+     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
+@@ -1449,7 +1449,7 @@ function(llvm_install_symlink name dest)
+   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
+ 
+   install(SCRIPT ${INSTALL_SYMLINK}
+-          CODE "install_symlink(${full_name} ${full_dest} ${LLVM_TOOLS_INSTALL_DIR})"
++          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+           COMPONENT ${component})
+ 
+   if (NOT CMAKE_CONFIGURATION_TYPES AND NOT ARG_ALWAYS_GENERATE)
+@@ -1531,7 +1531,8 @@ function(add_llvm_tool_symlink link_name target)
+     endif()
+ 
+     if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
+-      llvm_install_symlink(${link_name} ${target})
++      GNUInstallDirs_get_absolute_install_dir(output_dir LLVM_TOOLS_INSTALL_DIR)
++      llvm_install_symlink(${link_name} ${target} ${output_dir})
+     endif()
+   endif()
+ endfunction()
+@@ -1583,9 +1584,9 @@ function(llvm_setup_rpath name)
+ 
+   if (APPLE)
+     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
+-    set(_install_rpath "@loader_path/../lib" ${extra_libdir})
++    set(_install_rpath "@loader_path/../${CMAKE_INSTALL_LIBDIR}" ${extra_libdir})
+   elseif(UNIX)
+-    set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
+       set_property(TARGET ${name} APPEND_STRING PROPERTY
+                    LINK_FLAGS " -Wl,-z,origin ")
+diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
+index 02bab6846376..eff26adb2efc 100644
+--- a/cmake/modules/AddOCaml.cmake
++++ b/cmake/modules/AddOCaml.cmake
+@@ -140,9 +140,9 @@ function(add_ocaml_library name)
+   endforeach()
+ 
+   if( APPLE )
+-    set(ocaml_rpath "@executable_path/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "@executable_path/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   elseif( UNIX )
+-    set(ocaml_rpath "\\$ORIGIN/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "\\$ORIGIN/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   endif()
+   list(APPEND ocaml_flags "-ldopt" "-Wl,-rpath,${ocaml_rpath}")
+ 
+diff --git a/cmake/modules/AddSphinxTarget.cmake b/cmake/modules/AddSphinxTarget.cmake
+index 22e3dcb776aa..ba77b9c195e2 100644
+--- a/cmake/modules/AddSphinxTarget.cmake
++++ b/cmake/modules/AddSphinxTarget.cmake
+@@ -73,7 +73,7 @@ function (add_sphinx_target builder project)
+ 
+       elseif (builder STREQUAL html)
+         string(TOUPPER "${project}" project_upper)
+-        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
++        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/html"
+             CACHE STRING "HTML documentation install directory for ${project}")
+ 
+         # '/.' indicates: copy the contents of the directory directly into
+diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
+index 6074e8358594..9d0be6c2ced5 100644
+--- a/cmake/modules/CMakeLists.txt
++++ b/cmake/modules/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
++set(LLVM_INSTALL_PACKAGE_DIR ${LLVM_INSTALL_CMAKE_DIR} CACHE STRING "Path for CMake subdirectory (defaults to 'cmake/llvm')")
+ set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+ 
+ # First for users who use an installed LLVM, create the LLVMExports.cmake file.
+@@ -84,11 +84,11 @@ foreach(p ${_count})
+   set(LLVM_CONFIG_CODE "${LLVM_CONFIG_CODE}
+ get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
+ endforeach(p)
+-set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
+-set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
++set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
++set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
+ set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
+ set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
+-set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/bin")
++set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}")
+ set(LLVM_CONFIG_EXPORTS_FILE "\${LLVM_CMAKE_DIR}/LLVMExports.cmake")
+ set(LLVM_CONFIG_EXPORTS "${LLVM_EXPORTS}")
+ configure_file(
+diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
+index 482697b06baf..af2ac1e6c979 100644
+--- a/cmake/modules/LLVMInstallSymlink.cmake
++++ b/cmake/modules/LLVMInstallSymlink.cmake
+@@ -10,7 +10,7 @@ function(install_symlink name target outdir)
+     set(LINK_OR_COPY copy)
+   endif()
+ 
+-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
++  set(bindir "${DESTDIR}${outdir}/")
+ 
+   message("Creating ${name}")
+ 
+diff --git a/docs/CMake.rst b/docs/CMake.rst
+index 05edec64da33..6db014f04656 100644
+--- a/docs/CMake.rst
++++ b/docs/CMake.rst
+@@ -196,7 +196,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
+ **LLVM_LIBDIR_SUFFIX**:STRING
+   Extra suffix to append to the directory where libraries are to be
+   installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
+-  to install libraries to ``/usr/lib64``.
++  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
+ 
+ **CMAKE_C_FLAGS**:STRING
+   Extra flags to use when compiling C source files.
+@@ -465,8 +465,8 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
+   The path to install Doxygen-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/doxygen-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
+ 
+ **LLVM_ENABLE_SPHINX**:BOOL
+   If specified, CMake will search for the ``sphinx-build`` executable and will make
+@@ -497,13 +497,33 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_SPHINX_HTML_DIR**:STRING
+   The path to install Sphinx-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/html`.
+ 
+ **LLVM_INSTALL_OCAMLDOC_HTML_DIR**:STRING
+   The path to install OCamldoc-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/ocaml-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html`.
++
++**CMAKE_INSTALL_BINDIR**:STRING
++  The path to install binary tools, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `bin`.
++
++**CMAKE_INSTALL_LIBDIR**:STRING
++  The path to install libraries, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `lib`.
++
++**CMAKE_INSTALL_INCLUDEDIR**:STRING
++  The path to install header files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `include`.
++
++**CMAKE_INSTALL_DOCDIR**:STRING
++  The path to install documentation, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/doc`.
++
++**CMAKE_INSTALL_MANDIR**:STRING
++  The path to install manpage files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/man`.
+ 
+ **LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
+   OS X Only: If enabled CMake will generate a target named
+@@ -660,9 +680,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
+ 
+ This file is available in two different locations.
+ 
+-* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
+-  ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
+-  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
++* ``<LLVM_INSTALL_PACKAGE_DIR>LLVMConfig.cmake`` where
++  ``<LLVM_INSTALL_PACKAGE_DIR>`` is the location where LLVM CMake modules are
++  installed as part of an installed version of LLVM. This is typically
++  ``cmake/llvm/`` within the lib directory. On Linux, this is typically
++  ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
+ 
+ * ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
+   ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
+diff --git a/include/llvm/CMakeLists.txt b/include/llvm/CMakeLists.txt
+index 1d5ca3ba92b0..026f5453c1da 100644
+--- a/include/llvm/CMakeLists.txt
++++ b/include/llvm/CMakeLists.txt
+@@ -4,5 +4,5 @@ add_subdirectory(Support)
+ # If we're doing an out-of-tree build, copy a module map for generated
+ # header files into the build area.
+ if (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+-  configure_file(module.modulemap.build module.modulemap COPYONLY)
++  configure_file(module.modulemap.build ${LLVM_INCLUDE_DIR}/module.modulemap COPYONLY)
+ endif (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
+index f201e1f7bff0..4582ed556a02 100644
+--- a/tools/llvm-config/BuildVariables.inc.in
++++ b/tools/llvm-config/BuildVariables.inc.in
+@@ -24,6 +24,10 @@
+ #define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
+ #define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
+ #define LLVM_LIBDIR_SUFFIX "@LLVM_LIBDIR_SUFFIX@"
++#define LLVM_INSTALL_BINDIR "@CMAKE_INSTALL_BINDIR@"
++#define LLVM_INSTALL_LIBDIR "@CMAKE_INSTALL_LIBDIR@"
++#define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
++#define LLVM_INSTALL_CMAKEDIR "@LLVM_INSTALL_CMAKE_DIR@"
+ #define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
+ #define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
+ #define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
+diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
+index 08b096afb052..2deae0dcfacc 100644
+--- a/tools/llvm-config/llvm-config.cpp
++++ b/tools/llvm-config/llvm-config.cpp
+@@ -332,12 +332,26 @@ int main(int argc, char **argv) {
+         ("-I" + ActiveIncludeDir + " " + "-I" + ActiveObjRoot + "/include");
+   } else {
+     ActivePrefix = CurrentExecPrefix;
+-    ActiveIncludeDir = ActivePrefix + "/include";
+-    SmallString<256> path(StringRef(LLVM_TOOLS_INSTALL_DIR));
+-    sys::fs::make_absolute(ActivePrefix, path);
+-    ActiveBinDir = path.str();
+-    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
+-    ActiveCMakeDir = ActiveLibDir + "/cmake/llvm";
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_INCLUDEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveIncludeDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_BINDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveBinDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveLibDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_CMAKEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveCMakeDir = std::string(path.str());
++    }
+     ActiveIncludeOption = "-I" + ActiveIncludeDir;
+   }
+ 
+diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
+index 6e913519a809..85641eef721f 100644
+--- a/tools/lto/CMakeLists.txt
++++ b/tools/lto/CMakeLists.txt
+@@ -19,7 +19,7 @@ set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/lto.exports)
+ add_llvm_library(LTO SHARED ${SOURCES} DEPENDS intrinsics_gen)
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/lto.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT LTO)
+ 
+ if (APPLE)
+diff --git a/tools/opt-viewer/CMakeLists.txt b/tools/opt-viewer/CMakeLists.txt
+index 19b606933082..27b9f71b3d79 100644
+--- a/tools/opt-viewer/CMakeLists.txt
++++ b/tools/opt-viewer/CMakeLists.txt
+@@ -8,6 +8,6 @@ set (files
+ 
+ foreach (file ${files})
+   install(PROGRAMS ${file}
+-    DESTINATION share/opt-viewer
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/opt-viewer
+     COMPONENT opt-viewer)
+ endforeach (file)
diff --git a/pkgs/development/compilers/llvm/7/clang/default.nix b/pkgs/development/compilers/llvm/7/clang/default.nix
index 4ab13441e36..187602ef361 100644
--- a/pkgs/development/compilers/llvm/7/clang/default.nix
+++ b/pkgs/development/compilers/llvm/7/clang/default.nix
@@ -1,4 +1,5 @@
-{ lib, stdenv, fetch, cmake, libxml2, llvm, version, clang-tools-extra_src, python3, lld
+{ lib, stdenv, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+, buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
 , enablePolly ? false # TODO: get this info from llvm (passthru?)
@@ -23,17 +24,21 @@ let
       ++ lib.optional enableManpages python3.pkgs.sphinx
       ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-    buildInputs = [ libxml2 llvm lld ];
+    buildInputs = [ libxml2 libllvm ];
 
     cmakeFlags = [
       "-DCMAKE_CXX_FLAGS=-std=c++11"
       "-DLLVM_ENABLE_RTTI=ON"
+      "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
     ] ++ lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"
       "-DSPHINX_OUTPUT_MAN=ON"
       "-DSPHINX_OUTPUT_HTML=OFF"
       "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
     ] ++ lib.optionals enablePolly [
       "-DWITH_POLLY=ON"
       "-DLINK_POLLY_INTO_TOOLS=ON"
@@ -43,6 +48,10 @@ let
       ./purity.patch
       # make clang -xhip use $PATH to find executables
       ./HIP-use-PATH-7.patch
+      # Backport for the `--unwindlib=[libgcc|compiler-rt]` flag, which is
+      # needed for our bootstrapping to not interfere with C.
+      ./unwindlib.patch
+      ./gnu-install-dirs.patch
     ];
 
     postPatch = ''
@@ -59,12 +68,12 @@ let
         --replace "NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB" FALSE
     '';
 
-    outputs = [ "out" "lib" "python" ];
+    outputs = [ "out" "lib" "dev" "python" ];
 
     # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${llvm}/lib/LLVMgold.so ]; then
-        ln -sv ${llvm}/lib/LLVMgold.so $out/lib
+      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
+        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
       fi
 
       ln -sv $out/bin/clang $out/bin/cpp
@@ -81,11 +90,14 @@ let
       fi
       mv $out/share/clang/*.py $python/share/clang
       rm $out/bin/c-index-test
+
+      mkdir -p $dev/bin
+      cp bin/clang-tblgen $dev/bin
     '';
 
     passthru = {
       isClang = true;
-      inherit llvm;
+      inherit libllvm;
     };
 
     meta = {
diff --git a/pkgs/development/compilers/llvm/7/clang/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/7/clang/gnu-install-dirs.patch
new file mode 100644
index 00000000000..540c043a2db
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/clang/gnu-install-dirs.patch
@@ -0,0 +1,281 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 52b881939499..85662a2113e7 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -5,6 +5,8 @@ cmake_minimum_required(VERSION 3.4.3)
+ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
+   project(Clang)
+ 
++  include(GNUInstallDirs)
++
+   # Rely on llvm-config.
+   set(CONFIG_OUTPUT)
+   find_program(LLVM_CONFIG "llvm-config")
+@@ -374,7 +376,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/clang include/clang-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.def"
+     PATTERN "*.h"
+@@ -383,7 +385,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "CMakeFiles" EXCLUDE
+     PATTERN "*.inc"
+@@ -391,7 +393,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(PROGRAMS utils/bash-autocomplete.sh
+-    DESTINATION share/clang
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+     )
+ endif()
+ 
+diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
+index c09a8423f9f6..39f37e0097eb 100644
+--- a/cmake/modules/AddClang.cmake
++++ b/cmake/modules/AddClang.cmake
+@@ -99,9 +99,9 @@ macro(add_clang_library name)
+       install(TARGETS ${name}
+         COMPONENT ${name}
+         ${export_to_clangtargets}
+-        LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        RUNTIME DESTINATION bin)
++        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+       if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+         add_llvm_install_targets(install-${name}
+@@ -141,7 +141,7 @@ macro(add_clang_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_clangtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -156,5 +156,5 @@ endmacro()
+ macro(add_clang_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
+index 1930d8e225c7..bb9158093079 100644
+--- a/lib/Headers/CMakeLists.txt
++++ b/lib/Headers/CMakeLists.txt
+@@ -162,19 +162,19 @@ install(
+   FILES ${files} ${CMAKE_CURRENT_BINARY_DIR}/arm_neon.h
+   COMPONENT clang-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ install(
+   FILES ${files} ${CMAKE_CURRENT_BINARY_DIR}/arm_fp16.h
+   COMPONENT clang-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ install(
+   FILES ${cuda_wrapper_files}
+   COMPONENT clang-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include/cuda_wrappers)
++  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include/cuda_wrappers)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDE's.
+   add_llvm_install_targets(install-clang-headers
+diff --git a/tools/c-index-test/CMakeLists.txt b/tools/c-index-test/CMakeLists.txt
+index 53e3421f1b35..79ae5bb4c399 100644
+--- a/tools/c-index-test/CMakeLists.txt
++++ b/tools/c-index-test/CMakeLists.txt
+@@ -54,7 +54,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
+        "@executable_path/../../lib")
+   else()
+-    set(INSTALL_DESTINATION bin)
++    set(INSTALL_DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endif()
+ 
+   install(TARGETS c-index-test
+diff --git a/tools/clang-check/CMakeLists.txt b/tools/clang-check/CMakeLists.txt
+index c5ace26c2914..97bdfca7d896 100644
+--- a/tools/clang-check/CMakeLists.txt
++++ b/tools/clang-check/CMakeLists.txt
+@@ -20,4 +20,4 @@ target_link_libraries(clang-check
+   )
+ 
+ install(TARGETS clang-check
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-format/CMakeLists.txt b/tools/clang-format/CMakeLists.txt
+index a295e8cd0b2a..1973ff82c7f6 100644
+--- a/tools/clang-format/CMakeLists.txt
++++ b/tools/clang-format/CMakeLists.txt
+@@ -21,20 +21,20 @@ if( LLVM_LIB_FUZZING_ENGINE OR LLVM_USE_SANITIZE_COVERAGE )
+ endif()
+ 
+ install(PROGRAMS clang-format-bbedit.applescript
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-diff.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-sublime.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS git-clang-format
+-  DESTINATION bin
++  DESTINATION ${CMAKE_INSTALL_BINDIR}
+   COMPONENT clang-format)
+diff --git a/tools/clang-func-mapping/CMakeLists.txt b/tools/clang-func-mapping/CMakeLists.txt
+index ae28e28d532d..8ecb2e37a8f7 100644
+--- a/tools/clang-func-mapping/CMakeLists.txt
++++ b/tools/clang-func-mapping/CMakeLists.txt
+@@ -20,4 +20,4 @@ target_link_libraries(clang-func-mapping
+   )
+ 
+ install(TARGETS clang-func-mapping
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-offload-bundler/CMakeLists.txt b/tools/clang-offload-bundler/CMakeLists.txt
+index 8718015be76a..7a038f39622e 100644
+--- a/tools/clang-offload-bundler/CMakeLists.txt
++++ b/tools/clang-offload-bundler/CMakeLists.txt
+@@ -22,4 +22,4 @@ target_link_libraries(clang-offload-bundler
+   ${CLANG_OFFLOAD_BUNDLER_LIB_DEPS}
+   )
+ 
+-install(TARGETS clang-offload-bundler RUNTIME DESTINATION bin)
++install(TARGETS clang-offload-bundler RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-rename/CMakeLists.txt b/tools/clang-rename/CMakeLists.txt
+index 3b3ab1540a80..9aca9ba4a2cf 100644
+--- a/tools/clang-rename/CMakeLists.txt
++++ b/tools/clang-rename/CMakeLists.txt
+@@ -18,8 +18,8 @@ target_link_libraries(clang-rename
+   )
+ 
+ install(PROGRAMS clang-rename.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+ install(PROGRAMS clang-rename.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+diff --git a/tools/diagtool/CMakeLists.txt b/tools/diagtool/CMakeLists.txt
+index 96d1c390249c..41c762b37b76 100644
+--- a/tools/diagtool/CMakeLists.txt
++++ b/tools/diagtool/CMakeLists.txt
+@@ -21,7 +21,7 @@ target_link_libraries(diagtool
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(TARGETS diagtool
+     COMPONENT diagtool
+-    RUNTIME DESTINATION bin)
++    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+   if (NOT CMAKE_CONFIGURATION_TYPES)
+     add_llvm_install_targets(install-diagtool
+diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
+index e539c8308e75..4e1fbccea35d 100644
+--- a/tools/libclang/CMakeLists.txt
++++ b/tools/libclang/CMakeLists.txt
+@@ -130,7 +130,7 @@ endif()
+ if(INTERNAL_INSTALL_PREFIX)
+   set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
+ else()
+-  set(LIBCLANG_HEADERS_INSTALL_DESTINATION include)
++  set(LIBCLANG_HEADERS_INSTALL_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+ endif()
+ 
+ install(DIRECTORY ../../include/clang-c
+diff --git a/tools/scan-build/CMakeLists.txt b/tools/scan-build/CMakeLists.txt
+index 380379300b09..adfd58ed5f7d 100644
+--- a/tools/scan-build/CMakeLists.txt
++++ b/tools/scan-build/CMakeLists.txt
+@@ -41,7 +41,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/bin/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
++    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endforeach()
+ 
+   foreach(LibexecFile ${LibexecFiles})
+@@ -53,7 +53,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/libexec/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libexec/${LibexecFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/libexec/${LibexecFile})
+-    install(PROGRAMS libexec/${LibexecFile} DESTINATION libexec)
++    install(PROGRAMS libexec/${LibexecFile} DESTINATION ${CMAKE_INSTALL_LIBEXECDIR})
+   endforeach()
+ 
+   foreach(ManPage ${ManPages})
+@@ -77,7 +77,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/share/scan-build/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/scan-build/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-build/${ShareFile})
+-    install(FILES share/scan-build/${ShareFile} DESTINATION share/scan-build)
++    install(FILES share/scan-build/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-build)
+   endforeach()
+ 
+   add_custom_target(scan-build ALL DEPENDS ${Depends})
+diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
+index b305ca562a72..554bcb379061 100644
+--- a/tools/scan-view/CMakeLists.txt
++++ b/tools/scan-view/CMakeLists.txt
+@@ -21,7 +21,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                          ${CMAKE_BINARY_DIR}/bin/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
++    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endforeach()
+ 
+   foreach(ShareFile ${ShareFiles})
+@@ -33,7 +33,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                          ${CMAKE_BINARY_DIR}/share/scan-view/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-view/${ShareFile})
+-    install(FILES share/${ShareFile} DESTINATION share/scan-view)
++    install(FILES share/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-view)
+   endforeach()
+ 
+   add_custom_target(scan-view ALL DEPENDS ${Depends})
+diff --git a/utils/hmaptool/CMakeLists.txt b/utils/hmaptool/CMakeLists.txt
+index 5573009d343a..24b3a90f233f 100644
+--- a/utils/hmaptool/CMakeLists.txt
++++ b/utils/hmaptool/CMakeLists.txt
+@@ -9,7 +9,7 @@ add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HM
+                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${CLANG_HMAPTOOL})
+ 
+ list(APPEND Depends ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HMAPTOOL})
+-install(PROGRAMS ${CLANG_HMAPTOOL} DESTINATION bin)
++install(PROGRAMS ${CLANG_HMAPTOOL} DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ add_custom_target(hmaptool ALL DEPENDS ${Depends})
+ set_target_properties(hmaptool PROPERTIES FOLDER "Utils")
diff --git a/pkgs/development/compilers/llvm/7/clang/unwindlib.patch b/pkgs/development/compilers/llvm/7/clang/unwindlib.patch
new file mode 100644
index 00000000000..59a092d7c70
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/clang/unwindlib.patch
@@ -0,0 +1,227 @@
+commit a5cacb5ba7f1f18e7bb6f6709e42683eeb7e6470
+Author: Sterling Augustine <saugustine@google.com>
+Date:   Tue Mar 19 20:01:59 2019 +0000
+
+    Add --unwindlib=[libgcc|compiler-rt] to parallel --rtlib= [take 2]
+    
+    "clang++ hello.cc --rtlib=compiler-rt"
+    
+    now can works without specifying additional unwind or exception
+    handling libraries.
+    
+    This reworked version of the feature no longer modifies today's default
+    unwind library for compiler-rt: which is nothing. Rather, a user
+    can specify -DCLANG_DEFAULT_UNWINDLIB=libunwind when configuring
+    the compiler.
+    
+    This should address the issues from the previous version.
+    
+    Update tests for new --unwindlib semantics.
+    
+    Differential Revision: https://reviews.llvm.org/D59109
+    
+    llvm-svn: 356508
+
+diff --git clang/CMakeLists.txt clang/CMakeLists.txt
+index 52b881939499..2c3fb62f6e73 100644
+--- clang/CMakeLists.txt
++++ clang/CMakeLists.txt
+@@ -244,6 +244,24 @@ if (NOT(CLANG_DEFAULT_RTLIB STREQUAL "" OR
+     "Default runtime library to use (\"libgcc\" or \"compiler-rt\", empty for platform default)" FORCE)
+ endif()
+ 
++set(CLANG_DEFAULT_UNWINDLIB "" CACHE STRING
++  "Default unwind library to use (\"none\" \"libgcc\" or \"libunwind\", empty to match runtime library.)")
++if (CLANG_DEFAULT_UNWINDLIB STREQUAL "")
++  if (CLANG_DEFAULT_RTLIB STREQUAL "libgcc")
++    set (CLANG_DEFAULT_UNWINDLIB "libgcc" CACHE STRING "" FORCE)
++  elseif (CLANG_DEFAULT_RTLIBS STREQUAL "libunwind")
++    set (CLANG_DEFAULT_UNWINDLIB "none" CACHE STRING "" FORCE)
++  endif()
++endif()
++
++if (NOT(CLANG_DEFAULT_UNWINDLIB STREQUAL "none" OR
++        CLANG_DEFAULT_UNWINDLIB STREQUAL "libgcc" OR
++        CLANG_DEFAULT_UNWINDLIB STREQUAL "libunwind"))
++  message(WARNING "Resetting default unwindlib to use platform default")
++  set(CLANG_DEFAULT_UNWINDLIB "" CACHE STRING
++    "Default unwind library to use (\"none\" \"libgcc\" or \"libunwind\", empty for none)" FORCE)
++endif()
++
+ set(CLANG_DEFAULT_OBJCOPY "objcopy" CACHE STRING
+   "Default objcopy executable to use.")
+ 
+diff --git clang/include/clang/Basic/DiagnosticDriverKinds.td clang/include/clang/Basic/DiagnosticDriverKinds.td
+index 7f75f45c6578..7e1bb33b5cef 100644
+--- clang/include/clang/Basic/DiagnosticDriverKinds.td
++++ clang/include/clang/Basic/DiagnosticDriverKinds.td
+@@ -52,6 +52,10 @@ def err_drv_invalid_rtlib_name : Error<
+   "invalid runtime library name in argument '%0'">;
+ def err_drv_unsupported_rtlib_for_platform : Error<
+   "unsupported runtime library '%0' for platform '%1'">;
++def err_drv_invalid_unwindlib_name : Error<
++  "invalid unwind library name in argument '%0'">;
++def err_drv_incompatible_unwindlib : Error<
++  "--rtlib=libgcc requires --unwindlib=libgcc">;
+ def err_drv_invalid_stdlib_name : Error<
+   "invalid library name in argument '%0'">;
+ def err_drv_invalid_output_with_multiple_archs : Error<
+diff --git clang/include/clang/Config/config.h.cmake clang/include/clang/Config/config.h.cmake
+index 1d624450b9d9..2d4cb747e87e 100644
+--- clang/include/clang/Config/config.h.cmake
++++ clang/include/clang/Config/config.h.cmake
+@@ -23,6 +23,9 @@
+ /* Default runtime library to use. */
+ #define CLANG_DEFAULT_RTLIB "${CLANG_DEFAULT_RTLIB}"
+ 
++/* Default unwind library to use. */
++#define CLANG_DEFAULT_UNWINDLIB "${CLANG_DEFAULT_UNWINDLIB}"
++
+ /* Default objcopy to use */
+ #define CLANG_DEFAULT_OBJCOPY "${CLANG_DEFAULT_OBJCOPY}"
+ 
+diff --git clang/include/clang/Driver/Options.td clang/include/clang/Driver/Options.td
+index 601aa8744967..0e74a2d36dea 100644
+--- clang/include/clang/Driver/Options.td
++++ clang/include/clang/Driver/Options.td
+@@ -2428,6 +2428,8 @@ def std_EQ : Joined<["-", "--"], "std=">, Flags<[CC1Option]>,
+   }]>;
+ def stdlib_EQ : Joined<["-", "--"], "stdlib=">, Flags<[CC1Option]>,
+   HelpText<"C++ standard library to use">, Values<"libc++,libstdc++,platform">;
++def unwindlib_EQ : Joined<["-", "--"], "unwindlib=">, Flags<[CC1Option]>,
++  HelpText<"Unwind library to use">, Values<"libgcc,unwindlib,platform">;
+ def sub__library : JoinedOrSeparate<["-"], "sub_library">;
+ def sub__umbrella : JoinedOrSeparate<["-"], "sub_umbrella">;
+ def system_header_prefix : Joined<["--"], "system-header-prefix=">,
+diff --git clang/include/clang/Driver/ToolChain.h clang/include/clang/Driver/ToolChain.h
+index 2f9c2c190e32..d5b131bcf112 100644
+--- clang/include/clang/Driver/ToolChain.h
++++ clang/include/clang/Driver/ToolChain.h
+@@ -99,6 +99,12 @@ public:
+     RLT_Libgcc
+   };
+ 
++  enum UnwindLibType {
++    UNW_None,
++    UNW_CompilerRT,
++    UNW_Libgcc
++  };
++
+   enum RTTIMode {
+     RM_Enabled,
+     RM_Disabled,
+@@ -352,6 +358,10 @@ public:
+     return ToolChain::CST_Libstdcxx;
+   }
+ 
++  virtual UnwindLibType GetDefaultUnwindLibType() const {
++    return ToolChain::UNW_None;
++  }
++
+   virtual std::string getCompilerRTPath() const;
+ 
+   virtual std::string getCompilerRT(const llvm::opt::ArgList &Args,
+@@ -484,6 +494,10 @@ public:
+   // given compilation arguments.
+   virtual CXXStdlibType GetCXXStdlibType(const llvm::opt::ArgList &Args) const;
+ 
++  // GetUnwindLibType - Determine the unwind library type to use with the
++  // given compilation arguments.
++  virtual UnwindLibType GetUnwindLibType(const llvm::opt::ArgList &Args) const;
++
+   /// AddClangCXXStdlibIncludeArgs - Add the clang -cc1 level arguments to set
+   /// the include paths to use for the given C++ standard library type.
+   virtual void
+diff --git clang/lib/Driver/ToolChain.cpp clang/lib/Driver/ToolChain.cpp
+index cf3db34688df..d980dd5d23fb 100644
+--- clang/lib/Driver/ToolChain.cpp
++++ clang/lib/Driver/ToolChain.cpp
+@@ -665,6 +665,33 @@ ToolChain::RuntimeLibType ToolChain::GetRuntimeLibType(
+   return GetDefaultRuntimeLibType();
+ }
+ 
++ToolChain::UnwindLibType ToolChain::GetUnwindLibType(
++    const ArgList &Args) const {
++  const Arg *A = Args.getLastArg(options::OPT_unwindlib_EQ);
++  StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_UNWINDLIB;
++
++  if (LibName == "none")
++    return ToolChain::UNW_None;
++  else if (LibName == "platform" || LibName == "") {
++    ToolChain::RuntimeLibType RtLibType = GetRuntimeLibType(Args);
++    if (RtLibType == ToolChain::RLT_CompilerRT)
++      return ToolChain::UNW_None;
++    else if (RtLibType == ToolChain::RLT_Libgcc)
++      return ToolChain::UNW_Libgcc;
++  } else if (LibName == "libunwind") {
++    if (GetRuntimeLibType(Args) == RLT_Libgcc)
++      getDriver().Diag(diag::err_drv_incompatible_unwindlib);
++    return ToolChain::UNW_CompilerRT;
++  } else if (LibName == "libgcc")
++    return ToolChain::UNW_Libgcc;
++
++  if (A)
++    getDriver().Diag(diag::err_drv_invalid_unwindlib_name)
++        << A->getAsString(Args);
++
++  return GetDefaultUnwindLibType();
++}
++
+ ToolChain::CXXStdlibType ToolChain::GetCXXStdlibType(const ArgList &Args) const{
+   const Arg *A = Args.getLastArg(options::OPT_stdlib_EQ);
+   StringRef LibName = A ? A->getValue() : CLANG_DEFAULT_CXX_STDLIB;
+diff --git clang/test/Driver/compiler-rt-unwind.c clang/test/Driver/compiler-rt-unwind.c
+new file mode 100644
+index 000000000000..00024dfa7ed3
+--- /dev/null
++++ clang/test/Driver/compiler-rt-unwind.c
+@@ -0,0 +1,49 @@
++// General tests that the driver handles combinations of --rtlib=XXX and
++// --unwindlib=XXX properly.
++//
++// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
++// RUN:     --target=x86_64-unknown-linux \
++// RUN:     --gcc-toolchain="" \
++// RUN:   | FileCheck --check-prefix=RTLIB-EMPTY %s
++// RTLIB-EMPTY: "{{.*}}lgcc"
++// RTLIB-EMPTY: "{{.*}}-lgcc_s"
++//
++// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
++// RUN:     --target=x86_64-unknown-linux -rtlib=libgcc \
++// RUN:     --gcc-toolchain="" \
++// RUN:   | FileCheck --check-prefix=RTLIB-GCC %s
++// RTLIB-GCC: "{{.*}}lgcc"
++// RTLIB-GCC: "{{.*}}lgcc_s"
++//
++// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
++// RUN:     --target=x86_64-unknown-linux -rtlib=libgcc --unwindlib=libunwind \
++// RUN:     --gcc-toolchain="" \
++// RUN:   | FileCheck --check-prefix=RTLIB-GCC-UNWINDLIB-COMPILER-RT %s
++// RTLIB-GCC-UNWINDLIB-COMPILER-RT: "{{.*}}lgcc"
++// RTLIB-GCC-UNWINDLIB-COMPILER-RT: "{{.*}}lunwind"
++//
++// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1   \
++// RUN:     --target=x86_64-unknown-linux -rtlib=compiler-rt \
++// RUN:     --gcc-toolchain="" \
++// RUN:   | FileCheck --check-prefix=RTLIB-COMPILER-RT %s
++// RTLIB-COMPILER-RT: "{{.*}}libclang_rt.builtins-x86_64.a"
++//
++// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1   \
++// RUN:     --target=x86_64-unknown-linux -rtlib=compiler-rt --unwindlib=libgcc \
++// RUN:     --gcc-toolchain="" \
++// RUN:   | FileCheck --check-prefix=RTLIB-COMPILER-RT-UNWINDLIB-GCC %s
++// RTLIB-COMPILER-RT-UNWINDLIB-GCC: "{{.*}}libclang_rt.builtins-x86_64.a"
++// RTLIB-COMPILER-RT-UNWINDLIB-GCC: "{{.*}}lgcc_s"
++//
++// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1              \
++// RUN:     --target=x86_64-unknown-linux -rtlib=compiler-rt --unwindlib=libgcc \
++// RUN:     -static --gcc-toolchain="" \
++// RUN:   | FileCheck --check-prefix=RTLIB-COMPILER-RT-UNWINDLIB-GCC-STATIC %s
++// RTLIB-COMPILER-RT-UNWINDLIB-GCC-STATIC: "{{.*}}libclang_rt.builtins-x86_64.a"
++// RTLIB-COMPILER-RT-UNWINDLIB-GCC-STATIC: "{{.*}}lgcc_eh"
++//
++// RUN: not %clang -no-canonical-prefixes %s -o %t.o 2> %t.err              \
++// RUN:     --target=x86_64-unknown-linux -rtlib=libgcc --unwindlib=libunwind \
++// RUN:     --gcc-toolchain="" \
++// RUN: FileCheck --input-file=%t.err --check-prefix=RTLIB-GCC-UNWINDLIB-COMPILER_RT %s
++// RTLIB-GCC-UNWINDLIB-COMPILER_RT: "{{[.|\\\n]*}}--rtlib=libgcc requires --unwindlib=libgcc"
diff --git a/pkgs/development/compilers/llvm/7/compiler-rt/default.nix b/pkgs/development/compilers/llvm/7/compiler-rt/default.nix
index 21842131599..75d61a51e60 100644
--- a/pkgs/development/compilers/llvm/7/compiler-rt/default.nix
+++ b/pkgs/development/compilers/llvm/7/compiler-rt/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation {
   inherit version;
   src = fetch "compiler-rt" "1n48p8gjarihkws0i2bay5w9bdwyxyxxbpwyng7ba58jb30dlyq5";
 
-  nativeBuildInputs = [ cmake python3 llvm ];
+  nativeBuildInputs = [ cmake python3 llvm.dev ];
   buildInputs = lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
   NIX_CFLAGS_COMPILE = [
@@ -54,6 +54,7 @@ stdenv.mkDerivation {
     # https://github.com/llvm/llvm-project/commit/947f9692440836dcb8d88b74b69dd379d85974ce
     ../../common/compiler-rt/glibc.patch
     ./codesign.patch # Revert compiler-rt commit that makes codesign mandatory
+    ./gnu-install-dirs.patch
   ] ++ lib.optional (useLLVM) ./crtbegin-and-end.patch
     ++ lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
     ++ lib.optional stdenv.hostPlatform.isAarch32 ./armv7l.patch;
diff --git a/pkgs/development/compilers/llvm/7/compiler-rt/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/7/compiler-rt/gnu-install-dirs.patch
new file mode 100644
index 00000000000..fd7c6a690fa
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/compiler-rt/gnu-install-dirs.patch
@@ -0,0 +1,117 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 86ca2b3ef74b..555103bd97fe 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -8,6 +8,7 @@ cmake_minimum_required(VERSION 3.4.3)
+ # Check if compiler-rt is built as a standalone project.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR COMPILER_RT_STANDALONE_BUILD)
+   project(CompilerRT C CXX ASM)
++  include(GNUInstallDirs)
+   set(COMPILER_RT_STANDALONE_BUILD TRUE)
+   set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+ endif()
+diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake
+index cd4c704fc824..5abcd1260381 100644
+--- a/cmake/Modules/AddCompilerRT.cmake
++++ b/cmake/Modules/AddCompilerRT.cmake
+@@ -478,7 +478,7 @@ macro(add_compiler_rt_resource_file target_name file_name component)
+   add_custom_target(${target_name} DEPENDS ${dst_file})
+   # Install in Clang resource directory.
+   install(FILES ${file_name}
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/share
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}
+     COMPONENT ${component})
+   add_dependencies(${component} ${target_name})
+ 
+@@ -495,7 +495,7 @@ macro(add_compiler_rt_script name)
+   add_custom_target(${name} DEPENDS ${dst})
+   install(FILES ${dst}
+     PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/bin)
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_BINDIR})
+ endmacro(add_compiler_rt_script src name)
+ 
+ # Builds custom version of libc++ and installs it in <prefix>.
+diff --git a/cmake/Modules/CompilerRTDarwinUtils.cmake b/cmake/Modules/CompilerRTDarwinUtils.cmake
+index 04cc955980fa..a99f6dfb2f82 100644
+--- a/cmake/Modules/CompilerRTDarwinUtils.cmake
++++ b/cmake/Modules/CompilerRTDarwinUtils.cmake
+@@ -377,7 +377,7 @@ macro(darwin_add_embedded_builtin_libraries)
+     set(DARWIN_macho_embedded_LIBRARY_OUTPUT_DIR
+       ${COMPILER_RT_OUTPUT_DIR}/lib/macho_embedded)
+     set(DARWIN_macho_embedded_LIBRARY_INSTALL_DIR
+-      ${COMPILER_RT_INSTALL_PATH}/lib/macho_embedded)
++      ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/macho_embedded)
+       
+     set(CFLAGS_armv7 "-target thumbv7-apple-darwin-eabi")
+     set(CFLAGS_i386 "-march=pentium")
+diff --git a/cmake/Modules/CompilerRTUtils.cmake b/cmake/Modules/CompilerRTUtils.cmake
+index e5651718fa34..d95cfc984a85 100644
+--- a/cmake/Modules/CompilerRTUtils.cmake
++++ b/cmake/Modules/CompilerRTUtils.cmake
+@@ -330,7 +330,7 @@ endfunction()
+ function(get_compiler_rt_install_dir arch install_dir)
+   if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+     get_compiler_rt_target(${arch} target)
+-    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/${target}/lib PARENT_SCOPE)
++    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/${target}/${CMAKE_INSTALL_FULL_LIBDIR} PARENT_SCOPE)
+   else()
+     set(${install_dir} ${COMPILER_RT_LIBRARY_INSTALL_DIR} PARENT_SCOPE)
+   endif()
+diff --git a/cmake/base-config-ix.cmake b/cmake/base-config-ix.cmake
+index 91fe2494b476..b59a0ffc69f4 100644
+--- a/cmake/base-config-ix.cmake
++++ b/cmake/base-config-ix.cmake
+@@ -53,11 +53,11 @@ if (LLVM_TREE_AVAILABLE)
+ else()
+     # Take output dir and install path from the user.
+   set(COMPILER_RT_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH
+-    "Path where built compiler-rt libraries should be stored.")
++    "Path where built compiler-rt build artifacts should be stored.")
+   set(COMPILER_RT_EXEC_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/bin CACHE PATH
+     "Path where built compiler-rt executables should be stored.")
+-  set(COMPILER_RT_INSTALL_PATH ${CMAKE_INSTALL_PREFIX} CACHE PATH
+-    "Path where built compiler-rt libraries should be installed.")
++  set(COMPILER_RT_INSTALL_PATH "" CACHE PATH
++    "Prefix where built compiler-rt artifacts should be installed, comes before CMAKE_INSTALL_PREFIX.")
+   option(COMPILER_RT_INCLUDE_TESTS "Generate and build compiler-rt unit tests." OFF)
+   option(COMPILER_RT_ENABLE_WERROR "Fail and stop if warning is triggered" OFF)
+   # Use a host compiler to compile/link tests.
+@@ -85,7 +85,7 @@ else(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
+   set(COMPILER_RT_LIBRARY_OUTPUT_DIR
+     ${COMPILER_RT_OUTPUT_DIR}/lib/${COMPILER_RT_OS_DIR})
+   set(COMPILER_RT_LIBRARY_INSTALL_DIR
+-    ${COMPILER_RT_INSTALL_PATH}/lib/${COMPILER_RT_OS_DIR})
++    ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${COMPILER_RT_OS_DIR})
+ endif()
+ 
+ if(APPLE)
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index c4b93b89a30c..3913dc3a1ee6 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -48,12 +48,12 @@ set_target_properties(compiler-rt-headers PROPERTIES FOLDER "Compiler-RT Misc")
+ install(FILES ${SANITIZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/sanitizer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/sanitizer)
+ # Install xray headers.
+ install(FILES ${XRAY_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/xray)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/xray)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDEs.
+   add_custom_target(install-compiler-rt-headers
+diff --git a/lib/dfsan/CMakeLists.txt b/lib/dfsan/CMakeLists.txt
+index b3ae713cf02c..52b364b900f5 100644
+--- a/lib/dfsan/CMakeLists.txt
++++ b/lib/dfsan/CMakeLists.txt
+@@ -54,4 +54,4 @@ add_custom_command(OUTPUT ${dfsan_abilist_filename}
+                    DEPENDS done_abilist.txt libc_ubuntu1404_abilist.txt)
+ add_dependencies(dfsan dfsan_abilist)
+ install(FILES ${dfsan_abilist_filename}
+-        DESTINATION ${COMPILER_RT_INSTALL_PATH}/share)
++        DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_DATADIR})
diff --git a/pkgs/development/compilers/llvm/7/default.nix b/pkgs/development/compilers/llvm/7/default.nix
index 2170177117e..7aa3f9099cc 100644
--- a/pkgs/development/compilers/llvm/7/default.nix
+++ b/pkgs/development/compilers/llvm/7/default.nix
@@ -1,6 +1,5 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, gccForLibs
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
-, buildPackages
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 }:
@@ -18,42 +17,51 @@ let
   clang-tools-extra_src = fetch "clang-tools-extra" "0lb4kdh7j2fhfz8kd6iv5df7m3pikiryk1vvwsf87spc90n09q0w";
 
   tools = lib.makeExtensible (tools: let
-    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch; });
-    mkExtraBuildCommands = cc: ''
+    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch buildLlvmTools; });
+    mkExtraBuildCommands0 = cc: ''
       rsrc="$out/resource-root"
       mkdir "$rsrc"
-      ln -s "${cc}/lib/clang/${release_version}/include" "$rsrc"
-      ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
+      ln -s "${cc.lib}/lib/clang/${release_version}/include" "$rsrc"
       echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
     '';
+    mkExtraBuildCommands = cc: mkExtraBuildCommands0 cc + ''
+      ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
+    '';
+
   in {
 
-    llvm = callPackage ./llvm { };
+    libllvm = callPackage ./llvm { };
+
+    # `llvm` historically had the binaries.  When choosing an output explicitly,
+    # we need to reintroduce `outputUnspecified` to get the expected behavior e.g. of lib.get*
+    llvm = tools.libllvm.out // { outputUnspecified = true; };
+
+    libllvm-polly = callPackage ./llvm { enablePolly = true; };
 
-    llvm-polly = callPackage ./llvm { enablePolly = true; };
+    llvm-polly = tools.libllvm-polly.lib // { outputUnspecified = true; };
 
-    clang-unwrapped = callPackage ./clang {
-      inherit (tools) lld;
+    libclang = callPackage ./clang {
       inherit clang-tools-extra_src;
     };
+
+    clang-unwrapped = tools.libclang.out // { outputUnspecified = true; };
+
     clang-polly-unwrapped = callPackage ./clang {
       inherit clang-tools-extra_src;
-      llvm = tools.llvm-polly;
+      libllvm = tools.libllvm-polly;
       enablePolly = true;
     };
 
-    llvm-manpages = lowPrio (tools.llvm.override {
+    llvm-manpages = lowPrio (tools.libllvm.override {
       enableManpages = true;
       python3 = pkgs.python3;  # don't use python-boot
     });
 
-    clang-manpages = lowPrio (tools.clang-unwrapped.override {
+    clang-manpages = lowPrio (tools.libclang.override {
       enableManpages = true;
       python3 = pkgs.python3;  # don't use python-boot
     });
 
-    libclang = tools.clang-unwrapped.lib;
-
     clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
 
     libstdcxxClang = wrapCCWith rec {
@@ -141,7 +149,7 @@ let
       '' + mkExtraBuildCommands cc;
     };
 
-    lldClangNoCompilerRt = wrapCCWith {
+    lldClangNoCompilerRt = wrapCCWith rec {
       cc = tools.clang-unwrapped;
       libcxx = null;
       bintools = wrapBintoolsWith {
@@ -151,7 +159,7 @@ let
       extraPackages = [ ];
       extraBuildCommands = ''
         echo "-nostartfiles" >> $out/nix-support/cc-cflags
-      '';
+      '' + mkExtraBuildCommands0 cc;
     };
 
   });
@@ -181,6 +189,12 @@ let
         libunwind = libraries.libunwind;
       }));
 
+    libunwind = callPackage ./libunwind ({
+      inherit (buildLlvmTools) llvm;
+    } // lib.optionalAttrs (stdenv.hostPlatform.useLLVM or false) {
+      stdenv = overrideCC stdenv buildLlvmTools.lldClangNoLibcxx;
+    });
+
     openmp = callPackage ./openmp.nix {};
   });
 
diff --git a/pkgs/development/compilers/llvm/7/libc++/default.nix b/pkgs/development/compilers/llvm/7/libc++/default.nix
index fb50c4e24d7..afc59d91179 100644
--- a/pkgs/development/compilers/llvm/7/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/7/libc++/default.nix
@@ -13,7 +13,11 @@ stdenv.mkDerivation {
     export LIBCXXABI_INCLUDE_DIR="$PWD/$(ls -d libcxxabi-${version}*)/include"
   '';
 
-  patches = lib.optional stdenv.hostPlatform.isMusl ../../libcxx-0001-musl-hacks.patch;
+  outputs = [ "out" "dev" ];
+
+  patches = [
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional stdenv.hostPlatform.isMusl ../../libcxx-0001-musl-hacks.patch;
 
   prePatch = ''
     substituteInPlace lib/CMakeLists.txt --replace "/usr/lib/libc++" "\''${LIBCXX_LIBCXXABI_LIB_PATH}/libc++"
@@ -37,7 +41,8 @@ stdenv.mkDerivation {
     "-DLIBCXX_LIBCPPABI_VERSION=2"
     "-DLIBCXX_CXX_ABI=libcxxabi"
   ] ++ lib.optional stdenv.hostPlatform.isMusl "-DLIBCXX_HAS_MUSL_LIBC=1"
-  ++ lib.optional (!enableShared) "-DLIBCXX_ENABLE_SHARED=OFF" ;
+    ++ lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON"
+    ++ lib.optional (!enableShared) "-DLIBCXX_ENABLE_SHARED=OFF" ;
 
   passthru = {
     isLLVM = true;
diff --git a/pkgs/development/compilers/llvm/7/libc++/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/7/libc++/gnu-install-dirs.patch
new file mode 100644
index 00000000000..910e5287a86
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/libc++/gnu-install-dirs.patch
@@ -0,0 +1,72 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index acb49565ce97..6a863926cbca 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -26,6 +26,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   project(libcxx CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxx)
+   set(PACKAGE_VERSION 7.0.0)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+diff --git a/cmake/Modules/HandleLibCXXABI.cmake b/cmake/Modules/HandleLibCXXABI.cmake
+index 1c19d7e01af7..9c8aee8e8bb7 100644
+--- a/cmake/Modules/HandleLibCXXABI.cmake
++++ b/cmake/Modules/HandleLibCXXABI.cmake
+@@ -59,7 +59,7 @@ macro(setup_abi_lib abidefines abilib abifiles abidirs)
+ 
+         if (LIBCXX_INSTALL_HEADERS)
+           install(FILES "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}"
+-            DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1/${dstdir}
++            DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dstdir}
+             COMPONENT cxx-headers
+             PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+             )
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index d9def18d725c..16494dacaf6f 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -243,7 +243,7 @@ if (LIBCXX_INSTALL_HEADERS)
+   foreach(file ${files})
+     get_filename_component(dir ${file} DIRECTORY)
+     install(FILES ${file}
+-      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1/${dir}
++      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dir}
+       COMPONENT cxx-headers
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+     )
+@@ -252,7 +252,7 @@ if (LIBCXX_INSTALL_HEADERS)
+   if (LIBCXX_NEEDS_SITE_CONFIG)
+     # Install the generated header as __config.
+     install(FILES ${LIBCXX_BINARY_DIR}/__generated_config
+-      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1
++      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+       RENAME __config
+       COMPONENT cxx-headers)
+diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
+index e068edc8a7af..b63ad92d1d78 100644
+--- a/lib/CMakeLists.txt
++++ b/lib/CMakeLists.txt
+@@ -399,8 +399,8 @@ if (LIBCXX_INSTALL_LIBRARY)
+     set(experimental_lib cxx_experimental)
+   endif()
+   install(TARGETS ${LIBCXX_INSTALL_TARGETS} ${filesystem_lib} ${experimental_lib}
+-    LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
+-    ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
++    LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
++    ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
+     )
+   # NOTE: This install command must go after the cxx install command otherwise
+   # it will not be executed after the library symlinks are installed.
+@@ -408,7 +408,7 @@ if (LIBCXX_INSTALL_LIBRARY)
+     # Replace the libc++ filename with $<TARGET_LINKER_FILE:cxx>
+     # after we required CMake 3.0.
+     install(FILES "${LIBCXX_LIBRARY_DIR}/libc++${CMAKE_SHARED_LIBRARY_SUFFIX}"
+-      DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX}
++      DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX}
+       COMPONENT libcxx)
+   endif()
+ endif()
diff --git a/pkgs/development/compilers/llvm/7/libc++abi/default.nix b/pkgs/development/compilers/llvm/7/libc++abi/default.nix
index 84c47865141..31ead6eb421 100644
--- a/pkgs/development/compilers/llvm/7/libc++abi/default.nix
+++ b/pkgs/development/compilers/llvm/7/libc++abi/default.nix
@@ -1,5 +1,6 @@
-{ lib, stdenv, cmake, fetch, libcxx, llvm, version
-, standalone ? false
+{ lib, stdenv, cmake, fetch, libcxx, libunwind, llvm, version
+, standalone ? stdenv.hostPlatform.useLLVM or false
+, withLibunwind ? !stdenv.isDarwin && !stdenv.isFreeBSD && !stdenv.hostPlatform.isWasm
   # on musl the shared objects don't build
 , enableShared ? !stdenv.hostPlatform.isStatic
 }:
@@ -10,7 +11,7 @@ stdenv.mkDerivation {
 
   src = fetch "libcxxabi" "1zcqxsdjhawgz1cvpk07y3jl6fg9p3ay4nl69zsirqb2ghgyhhb2";
 
-  nativeBuildInputs = [ cmake ];
+  outputs = [ "out" "dev" ];
 
   postUnpack = ''
     unpackFile ${libcxx.src}
@@ -22,9 +23,18 @@ stdenv.mkDerivation {
     patch -p1 -d $(ls -d libcxx-*) -i ${../../libcxx-0001-musl-hacks.patch}
   '';
 
-  cmakeFlags =
-     lib.optional standalone "-DLLVM_ENABLE_LIBCXX=ON" ++
-     lib.optional (!enableShared) "-DLIBCXXABI_ENABLE_SHARED=OFF";
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = lib.optional withLibunwind libunwind;
+
+  cmakeFlags = lib.optionals standalone [
+    "-DLLVM_ENABLE_LIBCXX=ON"
+  ] ++ lib.optionals (standalone && withLibunwind) [
+    "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
+  ] ++ lib.optional (!enableShared) "-DLIBCXXABI_ENABLE_SHARED=OFF";
 
   installPhase = if stdenv.isDarwin
     then ''
diff --git a/pkgs/development/compilers/llvm/7/libc++abi/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/7/libc++abi/gnu-install-dirs.patch
new file mode 100644
index 00000000000..92d9e94fdee
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/libc++abi/gnu-install-dirs.patch
@@ -0,0 +1,28 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index d6648ede1f59..55a8f17ca5e6 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -20,6 +20,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   project(libcxxabi CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxxabi)
+   set(PACKAGE_VERSION 7.0.0svn)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index 776c51294330..314b45feac69 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -195,8 +195,8 @@ add_custom_target(cxxabi DEPENDS ${LIBCXXABI_BUILD_TARGETS})
+ 
+ if (LIBCXXABI_INSTALL_LIBRARY)
+   install(TARGETS ${LIBCXXABI_INSTALL_TARGETS}
+-    LIBRARY DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
+-    ARCHIVE DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
++    LIBRARY DESTINATION ${LIBCXXABI_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
++    ARCHIVE DESTINATION ${LIBCXXABI_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
+     )
+ endif()
+ 
diff --git a/pkgs/development/compilers/llvm/7/libunwind/default.nix b/pkgs/development/compilers/llvm/7/libunwind/default.nix
new file mode 100644
index 00000000000..14c0abc5153
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/libunwind/default.nix
@@ -0,0 +1,35 @@
+{ lib, stdenv, version, fetch, fetchpatch, cmake, llvm, libcxx
+, enableShared ? !stdenv.hostPlatform.isStatic
+}:
+
+stdenv.mkDerivation {
+  pname = "libunwind";
+  inherit version;
+
+  src = fetch "libunwind" "035dsxs10nyiqd00q07yycvmkjl01yz4jdlrjvmch8klxg4pyjhp";
+
+  patches = [
+    ./gnu-install-dirs.patch
+  ] ++ lib.optionals (stdenv.hostPlatform.useLLVM or false) [
+    # removes use of `new` that require libc++
+    (fetchpatch {
+      url = "https://github.com/llvm-mirror/libunwind/commit/34a45c630d4c79af403661d267db42fbe7de1178.patch";
+      sha256 = "0n0pv6jvcky8pn3srhrf9x5kbnd0d2kia9xlx2g590f5q0bgwfhv";
+    })
+    # cleans up remaining libc++ dependencies (mostly header inclusions)
+    (fetchpatch {
+      url = "https://github.com/llvm-mirror/libunwind/commit/e050272d2eb57eb4e56a37b429a61df2ebb8aa3e.patch";
+      sha256 = "170mwmj0wf40iyk1kzdpaiy36rz9n8dpl881h4h7s5da0rh51xya";
+      includes = [ "src/libunwind.cpp" "src/UnwindCursor.hpp" ];
+    })
+  ];
+
+  nativeBuildInputs = [ cmake llvm.dev ];
+
+  cmakeFlags = lib.optionals (!enableShared) [
+    "-DLIBUNWIND_ENABLE_SHARED=OFF"
+  ] ++ lib.optionals (stdenv.hostPlatform.useLLVM or false) [
+    "-DLIBUNWIND_HAS_NOSTDINCXX_FLAG=ON"
+    "-DLLVM_ENABLE_LIBCXX=ON"
+  ];
+}
diff --git a/pkgs/development/compilers/llvm/7/libunwind/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/7/libunwind/gnu-install-dirs.patch
new file mode 100644
index 00000000000..21d4fa80ea1
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/libunwind/gnu-install-dirs.patch
@@ -0,0 +1,28 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 0e48d713837a..05483c367bd1 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -18,6 +18,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   project(libunwind)
+ 
++  include(GNUInstallDirs)
++
+   # Rely on llvm-config.
+   set(CONFIG_OUTPUT)
+   if(NOT LLVM_CONFIG_PATH)
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index 937159e2cb86..07f8b936e7e5 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -141,8 +141,8 @@ add_custom_target(unwind DEPENDS ${LIBUNWIND_BUILD_TARGETS})
+ 
+ if (LIBUNWIND_INSTALL_LIBRARY)
+   install(TARGETS ${LIBUNWIND_INSTALL_TARGETS}
+-    LIBRARY DESTINATION ${LIBUNWIND_INSTALL_PREFIX}lib${LIBUNWIND_LIBDIR_SUFFIX} COMPONENT unwind
+-    ARCHIVE DESTINATION ${LIBUNWIND_INSTALL_PREFIX}lib${LIBUNWIND_LIBDIR_SUFFIX} COMPONENT unwind)
++    LIBRARY DESTINATION ${LIBUNWIND_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX} COMPONENT unwind
++    ARCHIVE DESTINATION ${LIBUNWIND_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX} COMPONENT unwind)
+ endif()
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES AND LIBUNWIND_INSTALL_LIBRARY)
diff --git a/pkgs/development/compilers/llvm/7/lld/default.nix b/pkgs/development/compilers/llvm/7/lld/default.nix
index f4c58abef8a..da863d5ad4a 100644
--- a/pkgs/development/compilers/llvm/7/lld/default.nix
+++ b/pkgs/development/compilers/llvm/7/lld/default.nix
@@ -1,8 +1,9 @@
 { lib, stdenv
+, buildLlvmTools
 , fetch
 , cmake
 , libxml2
-, llvm
+, libllvm
 , version
 }:
 
@@ -12,15 +13,20 @@ stdenv.mkDerivation {
 
   src = fetch "lld" "0rsqb7zcnij5r5ipfhr129j7skr5n9pyr388kjpqwh091952f3x1";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ llvm libxml2 ];
+  buildInputs = [ libllvm libxml2 ];
 
-  outputs = [ "out" "dev" ];
+  cmakeFlags = [
+    "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
+  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+  ];
 
-  postInstall = ''
-    moveToOutput include "$dev"
-    moveToOutput lib "$dev"
-  '';
+  outputs = [ "out" "lib" "dev" ];
 
   meta = {
     description = "The LLVM Linker";
diff --git a/pkgs/development/compilers/llvm/7/lld/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/7/lld/gnu-install-dirs.patch
new file mode 100644
index 00000000000..acc2d3d4776
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/lld/gnu-install-dirs.patch
@@ -0,0 +1,68 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index e2fbdbfbbb47..d601b231ebb8 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -6,6 +6,8 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   set(CMAKE_INCLUDE_CURRENT_DIR ON)
+   set(LLD_BUILT_STANDALONE TRUE)
+ 
++  include(GNUInstallDirs)
++
+   find_program(LLVM_CONFIG_PATH "llvm-config" DOC "Path to llvm-config binary")
+   if(NOT LLVM_CONFIG_PATH)
+     message(FATAL_ERROR "llvm-config not found: specify LLVM_CONFIG_PATH")
+@@ -203,7 +205,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/cmake/modules/AddLLD.cmake b/cmake/modules/AddLLD.cmake
+index fa48b428d26b..e7967aad3ceb 100644
+--- a/cmake/modules/AddLLD.cmake
++++ b/cmake/modules/AddLLD.cmake
+@@ -20,9 +20,9 @@ macro(add_lld_library name)
+     install(TARGETS ${name}
+       COMPONENT ${name}
+       ${export_to_lldtargets}
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      RUNTIME DESTINATION bin)
++      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+     if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+       add_llvm_install_targets(install-${name}
+@@ -54,7 +54,7 @@ macro(add_lld_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_lldtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -69,5 +69,5 @@ endmacro()
+ macro(add_lld_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/tools/lld/CMakeLists.txt b/tools/lld/CMakeLists.txt
+index d8829493fc22..df748a0e749b 100644
+--- a/tools/lld/CMakeLists.txt
++++ b/tools/lld/CMakeLists.txt
+@@ -16,7 +16,7 @@ target_link_libraries(lld
+   )
+ 
+ install(TARGETS lld
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ if(NOT LLD_SYMLINKS_TO_CREATE)
+   set(LLD_SYMLINKS_TO_CREATE lld-link ld.lld ld64.lld wasm-ld)
diff --git a/pkgs/development/compilers/llvm/7/lldb/default.nix b/pkgs/development/compilers/llvm/7/lldb/default.nix
index 3fa5b411f63..97888492879 100644
--- a/pkgs/development/compilers/llvm/7/lldb/default.nix
+++ b/pkgs/development/compilers/llvm/7/lldb/default.nix
@@ -7,32 +7,31 @@
 , which
 , libedit
 , libxml2
-, llvm
-, clang-unwrapped
+, libllvm
+, libclang
 , perl
 , python3
 , version
 , darwin
 }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "lldb";
   inherit version;
 
   src = fetch "lldb" "0klsscg1sczc4nw2l53xggi969k361cng2sjjrfp3bv4g5x14s4v";
 
-  nativeBuildInputs = [ cmake perl python3 which swig ];
-  buildInputs = [ ncurses zlib libedit libxml2 llvm ]
-    ++ lib.optionals stdenv.isDarwin [ darwin.libobjc darwin.apple_sdk.libs.xpc darwin.apple_sdk.frameworks.Foundation darwin.bootstrap_cmds darwin.apple_sdk.frameworks.Carbon darwin.apple_sdk.frameworks.Cocoa ];
-
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
 
   postPatch = ''
     # Fix up various paths that assume llvm and clang are installed in the same place
-    sed -i 's,".*ClangConfig.cmake","${clang-unwrapped}/lib/cmake/clang/ClangConfig.cmake",' \
+    sed -i 's,".*ClangConfig.cmake","${libclang.dev}/lib/cmake/clang/ClangConfig.cmake",' \
       cmake/modules/LLDBStandalone.cmake
-    sed -i 's,".*tools/clang/include","${clang-unwrapped}/include",' \
+    sed -i 's,".*tools/clang/include","${libclang.dev}/include",' \
       cmake/modules/LLDBStandalone.cmake
-    sed -i 's,"$.LLVM_LIBRARY_DIR.",${llvm}/lib ${clang-unwrapped}/lib,' \
+    sed -i 's,"$.LLVM_LIBRARY_DIR.",${libllvm.lib}/lib ${libclang.lib}/lib,' \
       cmake/modules/LLDBStandalone.cmake
     sed -i -e 's,message(SEND_ERROR "Cannot find debugserver on system."),,' \
            -e 's,string(STRIP ''${XCODE_DEV_DIR} XCODE_DEV_DIR),,' \
@@ -42,9 +41,18 @@ stdenv.mkDerivation {
     patchShebangs scripts
   '';
 
-  cmakeFlags = [
-    "-DLLDB_CODESIGN_IDENTITY=" # codesigning makes nondeterministic
-    "-DSKIP_DEBUGSERVER=ON"
+  outputs = [ "out" "lib" "dev" ];
+
+  nativeBuildInputs = [
+    cmake perl python3 which swig
+  ];
+
+  buildInputs = [
+    ncurses zlib libedit libxml2 libllvm
+  ] ++ lib.optionals stdenv.isDarwin [
+    darwin.libobjc
+    darwin.apple_sdk.libs.xpc
+    darwin.apple_sdk.frameworks.Foundation darwin.bootstrap_cmds darwin.apple_sdk.frameworks.Carbon darwin.apple_sdk.frameworks.Cocoa
   ];
 
   CXXFLAGS = "-fno-rtti";
@@ -52,6 +60,17 @@ stdenv.mkDerivation {
 
   NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-I${libxml2.dev}/include/libxml2";
 
+  cmakeFlags = [
+    "-DLLDB_INCLUDE_TESTS=${if doCheck then "YES" else "NO"}"
+    "-DLLDB_CODESIGN_IDENTITY=" # codesigning makes nondeterministic
+    "-DSKIP_DEBUGSERVER=ON"
+  ] ++ lib.optionals doCheck [
+    "-DLLDB_TEST_C_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
+    "-DLLDB_TEST_CXX_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++"
+  ];
+
+  doCheck = false;
+
   postInstall = ''
     mkdir -p $out/share/man/man1
     cp ../docs/lldb.1 $out/share/man/man1/
diff --git a/pkgs/development/compilers/llvm/7/lldb/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/7/lldb/gnu-install-dirs.patch
new file mode 100644
index 00000000000..40645743ecc
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/lldb/gnu-install-dirs.patch
@@ -0,0 +1,76 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 00ddcdc1488f..af2aa238939a 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -7,6 +7,8 @@ set(CMAKE_MODULE_PATH
+   "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules"
+   )
+ 
++include(GNUInstallDirs)
++
+ include(LLDBStandalone)
+ include(LLDBConfig)
+ include(AddLLDB)
+diff --git a/cmake/modules/AddLLDB.cmake b/cmake/modules/AddLLDB.cmake
+index 129a5ef7500d..fb3fb3ce655c 100644
+--- a/cmake/modules/AddLLDB.cmake
++++ b/cmake/modules/AddLLDB.cmake
+@@ -56,14 +56,14 @@ function(add_lldb_library name)
+         endif()
+         install(TARGETS ${name}
+           COMPONENT ${name}
+-          RUNTIME DESTINATION bin
++          RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+           LIBRARY DESTINATION ${out_dir}
+           ARCHIVE DESTINATION ${out_dir})
+       else()
+         install(TARGETS ${name}
+           COMPONENT ${name}
+-          LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-          ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++          LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++          ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+       endif()
+       if (NOT CMAKE_CONFIGURATION_TYPES)
+         add_llvm_install_targets(install-${name}
+@@ -121,7 +121,7 @@ function(add_lldb_executable name)
+   endif()
+ 
+   if(ARG_GENERATE_INSTALL)
+-    set(out_dir "bin")
++    set(out_dir "${CMAKE_INSTALL_BINDIR}")
+     if (LLDB_BUILD_FRAMEWORK AND ARG_INCLUDE_IN_SUITE)
+       set(out_dir ${LLDB_FRAMEWORK_INSTALL_DIR}/${LLDB_FRAMEWORK_RESOURCE_DIR})
+     endif()
+diff --git a/cmake/modules/LLDBConfig.cmake b/cmake/modules/LLDBConfig.cmake
+index dae6e365da38..ef272d5de5c0 100644
+--- a/cmake/modules/LLDBConfig.cmake
++++ b/cmake/modules/LLDBConfig.cmake
+@@ -278,7 +278,7 @@ include_directories(BEFORE
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+@@ -288,7 +288,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/tools/intel-features/CMakeLists.txt b/tools/intel-features/CMakeLists.txt
+index b5316540fdf3..3c3c882d503f 100644
+--- a/tools/intel-features/CMakeLists.txt
++++ b/tools/intel-features/CMakeLists.txt
+@@ -64,4 +64,4 @@ if (NOT LLDB_DISABLE_PYTHON AND LLDB_BUILD_INTEL_PT)
+ endif()
+ 
+ install(TARGETS lldbIntelFeatures
+-  LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
diff --git a/pkgs/development/compilers/llvm/7/llvm/default.nix b/pkgs/development/compilers/llvm/7/llvm/default.nix
index 53a7301b19b..6f189779f84 100644
--- a/pkgs/development/compilers/llvm/7/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/7/llvm/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv
+, pkgsBuildBuild
 , fetch
 , fetchpatch
 , cmake
@@ -11,10 +12,10 @@
 , version
 , release_version
 , zlib
-, buildPackages
+, buildLlvmTools
 , debugVersion ? false
 , enableManpages ? false
-, enableSharedLibraries ? true
+, enableSharedLibraries ? !stdenv.hostPlatform.isStatic
 , enablePFM ? !(stdenv.isDarwin
   || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
   || stdenv.isAarch32 # broken for the armv7l builder
@@ -46,8 +47,7 @@ in stdenv.mkDerivation ({
     mv polly-* $sourceRoot/tools/polly
   '';
 
-  outputs = [ "out" "python" ]
-    ++ optional enableSharedLibraries "lib";
+  outputs = [ "out" "lib" "dev" "python" ];
 
   nativeBuildInputs = [ cmake python3 ]
     ++ optional enableManpages python3.pkgs.sphinx;
@@ -67,12 +67,13 @@ in stdenv.mkDerivation ({
       url = "https://github.com/llvm-mirror/llvm/commit/cc1f2a595ead516812a6c50398f0f3480ebe031f.patch";
       sha256 = "0k6k1p5yisgwx417a67s7sr9930rqh1n0zv5jvply8vjjy4b3kf8";
     })
-  ];
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
 
   postPatch = optionalString stdenv.isDarwin ''
     substituteInPlace cmake/modules/AddLLVM.cmake \
       --replace 'set(_install_name_dir INSTALL_NAME_DIR "@rpath")' "set(_install_name_dir)" \
-      --replace 'set(_install_rpath "@loader_path/../lib" ''${extra_libdir})' ""
+      --replace 'set(_install_rpath "@loader_path/../''${CMAKE_INSTALL_LIBDIR}" ''${extra_libdir})' ""
   ''
   # Patch llvm-config to return correct library path based on --link-{shared,static}.
   + optionalString (enableSharedLibraries) ''
@@ -110,6 +111,7 @@ in stdenv.mkDerivation ({
   '';
 
   cmakeFlags = with stdenv; [
+    "-DLLVM_INSTALL_CMAKE_DIR=${placeholder "dev"}/lib/cmake/llvm/"
     "-DCMAKE_BUILD_TYPE=${if debugVersion then "Debug" else "Release"}"
     "-DLLVM_INSTALL_UTILS=ON"  # Needed by rustc
     "-DLLVM_BUILD_TESTS=ON"
@@ -134,7 +136,20 @@ in stdenv.mkDerivation ({
     "-DCAN_TARGET_i386=false"
   ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
     "-DCMAKE_CROSSCOMPILING=True"
-    "-DLLVM_TABLEGEN=${buildPackages.llvm_7}/bin/llvm-tblgen"
+    "-DLLVM_TABLEGEN=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+    (
+      let
+        nativeCC = pkgsBuildBuild.targetPackages.stdenv.cc;
+        nativeBintools = nativeCC.bintools.bintools;
+        nativeToolchainFlags = [
+          "-DCMAKE_C_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}cc"
+          "-DCMAKE_CXX_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}c++"
+          "-DCMAKE_AR=${nativeBintools}/bin/${nativeBintools.targetPrefix}ar"
+          "-DCMAKE_STRIP=${nativeBintools}/bin/${nativeBintools.targetPrefix}strip"
+          "-DCMAKE_RANLIB=${nativeBintools}/bin/${nativeBintools.targetPrefix}ranlib"
+        ];
+      in "-DCROSS_TOOLCHAIN_FLAGS_NATIVE:list=${lib.concatStringsSep ";" nativeToolchainFlags}"
+    )
   ];
 
   postBuild = ''
@@ -148,19 +163,20 @@ in stdenv.mkDerivation ({
   postInstall = ''
     mkdir -p $python/share
     mv $out/share/opt-viewer $python/share/opt-viewer
-  ''
-  + optionalString enableSharedLibraries ''
-    moveToOutput "lib/libLLVM-*" "$lib"
-    moveToOutput "lib/libLLVM${stdenv.hostPlatform.extensions.sharedLibrary}" "$lib"
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM-" "$lib/lib/libLLVM-"
+    moveToOutput "bin/llvm-config*" "$dev"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
+      --replace "\''${_IMPORT_PREFIX}/lib/lib" "$lib/lib/lib" \
+      --replace "$out/bin/llvm-config" "$dev/bin/llvm-config"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMConfig.cmake" \
+      --replace 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}")' 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}'"$lib"'")'
   ''
   + optionalString (stdenv.isDarwin && enableSharedLibraries) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM.dylib" "$lib/lib/libLLVM.dylib"
     ${lib.concatMapStringsSep "\n" (v: ''
       ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${v}.dylib
     '') versionSuffixes}
+  ''
+  + optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    cp NATIVE/bin/llvm-config $dev/bin/llvm-config-native
   '';
 
   doCheck = stdenv.isLinux && (!stdenv.isx86_32);
diff --git a/pkgs/development/compilers/llvm/7/llvm/gnu-install-dirs-polly.patch b/pkgs/development/compilers/llvm/7/llvm/gnu-install-dirs-polly.patch
new file mode 100644
index 00000000000..0b2d3b79e41
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/llvm/gnu-install-dirs-polly.patch
@@ -0,0 +1,106 @@
+diff --git a/tools/polly/CMakeLists.txt b/tools/polly/CMakeLists.txt
+index 9939097f743e..8cc538da912a 100644
+--- a/tools/polly/CMakeLists.txt
++++ b/tools/polly/CMakeLists.txt
+@@ -2,7 +2,11 @@
+ if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   project(Polly)
+   cmake_minimum_required(VERSION 3.4.3)
++endif()
++
++include(GNUInstallDirs)
+ 
++if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   # Where is LLVM installed?
+   find_package(LLVM CONFIG REQUIRED)
+   set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+@@ -145,14 +149,14 @@ include_directories(
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+     )
+ 
+   install(DIRECTORY ${POLLY_BINARY_DIR}/include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN "CMakeFiles" EXCLUDE
+diff --git a/tools/polly/cmake/CMakeLists.txt b/tools/polly/cmake/CMakeLists.txt
+index 969292cd6b00..d7aea77bdd20 100644
+--- a/tools/polly/cmake/CMakeLists.txt
++++ b/tools/polly/cmake/CMakeLists.txt
+@@ -79,18 +79,18 @@ file(GENERATE
+ 
+ # Generate PollyConfig.cmake for the install tree.
+ unset(POLLY_EXPORTS)
+-set(POLLY_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
++set(POLLY_INSTALL_PREFIX "")
+ set(POLLY_CONFIG_LLVM_CMAKE_DIR "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}")
++set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
++set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+ if (POLLY_BUNDLED_ISL)
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
+-    "${POLLY_INSTALL_PREFIX}/include/polly"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}/polly"
+     )
+ else()
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+     ${ISL_INCLUDE_DIRS}
+     )
+ endif()
+@@ -100,12 +100,12 @@ endif()
+ foreach(tgt IN LISTS POLLY_CONFIG_EXPORTED_TARGETS)
+   get_target_property(tgt_type ${tgt} TYPE)
+   if (tgt_type STREQUAL "EXECUTABLE")
+-    set(tgt_prefix "bin/")
++    set(tgt_prefix "${CMAKE_INSTALL_BINDIR}/")
+   else()
+-    set(tgt_prefix "lib/")
++    set(tgt_prefix "${CMAKE_INSTALL_LIBDIR}/")
+   endif()
+ 
+-  set(tgt_path "${CMAKE_INSTALL_PREFIX}/${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
++  set(tgt_path "${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
+   file(RELATIVE_PATH tgt_path ${POLLY_CONFIG_CMAKE_DIR} ${tgt_path})
+ 
+   if (NOT tgt_type STREQUAL "INTERFACE_LIBRARY")
+diff --git a/tools/polly/cmake/polly_macros.cmake b/tools/polly/cmake/polly_macros.cmake
+index e48203871884..5bc8a2a52541 100644
+--- a/tools/polly/cmake/polly_macros.cmake
++++ b/tools/polly/cmake/polly_macros.cmake
+@@ -44,8 +44,8 @@ macro(add_polly_library name)
+   if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LLVMPolly")
+     install(TARGETS ${name}
+       EXPORT LLVMExports
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++	  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   endif()
+   set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+ endmacro(add_polly_library)
+diff --git a/tools/polly/lib/External/CMakeLists.txt b/tools/polly/lib/External/CMakeLists.txt
+index 8ffd984e542b..261cc19f3238 100644
+--- a/tools/polly/lib/External/CMakeLists.txt
++++ b/tools/polly/lib/External/CMakeLists.txt
+@@ -274,7 +274,7 @@ if (POLLY_BUNDLED_ISL)
+     install(DIRECTORY
+       ${ISL_SOURCE_DIR}/include/
+       ${ISL_BINARY_DIR}/include/
+-      DESTINATION include/polly
++      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/polly
+       FILES_MATCHING
+       PATTERN "*.h"
+       PATTERN "CMakeFiles" EXCLUDE
diff --git a/pkgs/development/compilers/llvm/7/llvm/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/7/llvm/gnu-install-dirs.patch
new file mode 100644
index 00000000000..7e7921e49ab
--- /dev/null
+++ b/pkgs/development/compilers/llvm/7/llvm/gnu-install-dirs.patch
@@ -0,0 +1,386 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index a3d3013cedcd..b298d6ef04af 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -275,15 +275,21 @@ if (CMAKE_BUILD_TYPE AND
+   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+ endif()
+ 
++include(GNUInstallDirs)
++
+ set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
+ 
+-set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
++set(LLVM_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE STRING
++    "Path for binary subdirectory (defaults to 'bin')")
+ mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+ 
+ set(LLVM_UTILS_INSTALL_DIR "${LLVM_TOOLS_INSTALL_DIR}" CACHE STRING
+     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
+ mark_as_advanced(LLVM_UTILS_INSTALL_DIR)
+ 
++set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
++	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
++
+ # They are used as destination of target generators.
+ set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
+ set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
+@@ -531,9 +537,9 @@ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
+ option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
+ option (LLVM_ENABLE_BINDINGS "Build bindings." ON)
+ 
+-set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
++set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html"
+     CACHE STRING "Doxygen-generated HTML documentation install directory")
+-set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
++set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html"
+     CACHE STRING "OCamldoc-generated HTML documentation install directory")
+ 
+ option (LLVM_BUILD_EXTERNAL_COMPILER_RT
+@@ -966,7 +972,7 @@ endif()
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/llvm include/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -978,7 +984,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm ${LLVM_INCLUDE_DIR}/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
+index c0f90ba7068d..d656156ff9c8 100644
+--- a/cmake/modules/AddLLVM.cmake
++++ b/cmake/modules/AddLLVM.cmake
+@@ -638,11 +638,11 @@ macro(add_llvm_library name)
+   else()
+     if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LTO" OR
+         (LLVM_LINK_LLVM_DYLIB AND ${name} STREQUAL "LLVM"))
+-      set(install_dir lib${LLVM_LIBDIR_SUFFIX})
++      set(install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+       if(ARG_SHARED OR BUILD_SHARED_LIBS)
+         if(WIN32 OR CYGWIN OR MINGW)
+           set(install_type RUNTIME)
+-          set(install_dir bin)
++          set(install_dir ${CMAKE_INSTALL_BINDIR})
+         else()
+           set(install_type LIBRARY)
+         endif()
+@@ -684,9 +684,9 @@ macro(add_llvm_loadable_module name)
+       if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+         if(WIN32 OR CYGWIN)
+           # DLL platform
+-          set(dlldir "bin")
++          set(dlldir "${CMAKE_INSTALL_BINDIR}")
+         else()
+-          set(dlldir "lib${LLVM_LIBDIR_SUFFIX}")
++          set(dlldir "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+         endif()
+ 
+         if(${name} IN_LIST LLVM_DISTRIBUTION_COMPONENTS OR
+@@ -698,7 +698,7 @@ macro(add_llvm_loadable_module name)
+         install(TARGETS ${name}
+                 ${export_to_llvmexports}
+                 LIBRARY DESTINATION ${dlldir}
+-                ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++                ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+       endif()
+       set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+     endif()
+@@ -912,7 +912,7 @@ macro(add_llvm_example name)
+   endif()
+   add_llvm_executable(${name} ${ARGN})
+   if( LLVM_BUILD_EXAMPLES )
+-    install(TARGETS ${name} RUNTIME DESTINATION examples)
++    install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   endif()
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endmacro(add_llvm_example name)
+@@ -1430,7 +1430,7 @@ function(llvm_install_library_symlink name dest type)
+   set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
+   set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
+ 
+-  set(output_dir lib${LLVM_LIBDIR_SUFFIX})
++  set(output_dir ${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   if(WIN32 AND "${type}" STREQUAL "SHARED")
+     set(output_dir bin)
+   endif()
+@@ -1446,7 +1446,7 @@ function(llvm_install_library_symlink name dest type)
+   endif()
+ endfunction()
+ 
+-function(llvm_install_symlink name dest)
++function(llvm_install_symlink name dest output_dir)
+   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
+   foreach(path ${CMAKE_MODULE_PATH})
+     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
+@@ -1469,7 +1469,7 @@ function(llvm_install_symlink name dest)
+   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
+ 
+   install(SCRIPT ${INSTALL_SYMLINK}
+-          CODE "install_symlink(${full_name} ${full_dest} ${LLVM_TOOLS_INSTALL_DIR})"
++          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+           COMPONENT ${component})
+ 
+   if (NOT CMAKE_CONFIGURATION_TYPES AND NOT ARG_ALWAYS_GENERATE)
+@@ -1551,7 +1551,8 @@ function(add_llvm_tool_symlink link_name target)
+     endif()
+ 
+     if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
+-      llvm_install_symlink(${link_name} ${target})
++      GNUInstallDirs_get_absolute_install_dir(output_dir LLVM_TOOLS_INSTALL_DIR)
++      llvm_install_symlink(${link_name} ${target} ${output_dir})
+     endif()
+   endif()
+ endfunction()
+@@ -1635,9 +1636,9 @@ function(llvm_setup_rpath name)
+ 
+   if (APPLE)
+     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
+-    set(_install_rpath "@loader_path/../lib" ${extra_libdir})
++    set(_install_rpath "@loader_path/../${CMAKE_INSTALL_LIBDIR}" ${extra_libdir})
+   elseif(UNIX)
+-    set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
+       set_property(TARGET ${name} APPEND_STRING PROPERTY
+                    LINK_FLAGS " -Wl,-z,origin ")
+diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
+index 02bab6846376..eff26adb2efc 100644
+--- a/cmake/modules/AddOCaml.cmake
++++ b/cmake/modules/AddOCaml.cmake
+@@ -140,9 +140,9 @@ function(add_ocaml_library name)
+   endforeach()
+ 
+   if( APPLE )
+-    set(ocaml_rpath "@executable_path/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "@executable_path/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   elseif( UNIX )
+-    set(ocaml_rpath "\\$ORIGIN/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "\\$ORIGIN/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   endif()
+   list(APPEND ocaml_flags "-ldopt" "-Wl,-rpath,${ocaml_rpath}")
+ 
+diff --git a/cmake/modules/AddSphinxTarget.cmake b/cmake/modules/AddSphinxTarget.cmake
+index 22e3dcb776aa..ba77b9c195e2 100644
+--- a/cmake/modules/AddSphinxTarget.cmake
++++ b/cmake/modules/AddSphinxTarget.cmake
+@@ -73,7 +73,7 @@ function (add_sphinx_target builder project)
+ 
+       elseif (builder STREQUAL html)
+         string(TOUPPER "${project}" project_upper)
+-        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
++        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/html"
+             CACHE STRING "HTML documentation install directory for ${project}")
+ 
+         # '/.' indicates: copy the contents of the directory directly into
+diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
+index 6c316a2f04fb..129c0995059c 100644
+--- a/cmake/modules/CMakeLists.txt
++++ b/cmake/modules/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
++set(LLVM_INSTALL_PACKAGE_DIR ${LLVM_INSTALL_CMAKE_DIR} CACHE STRING "Path for CMake subdirectory (defaults to 'cmake/llvm')")
+ set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+ 
+ # First for users who use an installed LLVM, create the LLVMExports.cmake file.
+@@ -90,11 +90,11 @@ foreach(p ${_count})
+   set(LLVM_CONFIG_CODE "${LLVM_CONFIG_CODE}
+ get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
+ endforeach(p)
+-set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
+-set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
++set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
++set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
+ set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
+ set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
+-set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/bin")
++set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}")
+ set(LLVM_CONFIG_EXPORTS_FILE "\${LLVM_CMAKE_DIR}/LLVMExports.cmake")
+ set(LLVM_CONFIG_EXPORTS "${LLVM_EXPORTS}")
+ configure_file(
+diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
+index 1a04de931ff7..1c5ea4200635 100644
+--- a/cmake/modules/LLVMInstallSymlink.cmake
++++ b/cmake/modules/LLVMInstallSymlink.cmake
+@@ -10,7 +10,7 @@ function(install_symlink name target outdir)
+     set(LINK_OR_COPY copy)
+   endif()
+ 
+-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
++  set(bindir "${DESTDIR}${outdir}/")
+ 
+   message("Creating ${name}")
+ 
+diff --git a/docs/CMake.rst b/docs/CMake.rst
+index cbcadc212498..a3da96546f43 100644
+--- a/docs/CMake.rst
++++ b/docs/CMake.rst
+@@ -196,7 +196,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
+ **LLVM_LIBDIR_SUFFIX**:STRING
+   Extra suffix to append to the directory where libraries are to be
+   installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
+-  to install libraries to ``/usr/lib64``.
++  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
+ 
+ **CMAKE_C_FLAGS**:STRING
+   Extra flags to use when compiling C source files.
+@@ -473,8 +473,8 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
+   The path to install Doxygen-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/doxygen-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
+ 
+ **LLVM_ENABLE_SPHINX**:BOOL
+   If specified, CMake will search for the ``sphinx-build`` executable and will make
+@@ -505,13 +505,33 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_SPHINX_HTML_DIR**:STRING
+   The path to install Sphinx-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/html`.
+ 
+ **LLVM_INSTALL_OCAMLDOC_HTML_DIR**:STRING
+   The path to install OCamldoc-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/ocaml-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html`.
++
++**CMAKE_INSTALL_BINDIR**:STRING
++  The path to install binary tools, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `bin`.
++
++**CMAKE_INSTALL_LIBDIR**:STRING
++  The path to install libraries, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `lib`.
++
++**CMAKE_INSTALL_INCLUDEDIR**:STRING
++  The path to install header files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `include`.
++
++**CMAKE_INSTALL_DOCDIR**:STRING
++  The path to install documentation, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/doc`.
++
++**CMAKE_INSTALL_MANDIR**:STRING
++  The path to install manpage files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/man`.
+ 
+ **LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
+   OS X Only: If enabled CMake will generate a target named
+@@ -676,9 +696,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
+ 
+ This file is available in two different locations.
+ 
+-* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
+-  ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
+-  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
++* ``<LLVM_INSTALL_PACKAGE_DIR>LLVMConfig.cmake`` where
++  ``<LLVM_INSTALL_PACKAGE_DIR>`` is the location where LLVM CMake modules are
++  installed as part of an installed version of LLVM. This is typically
++  ``cmake/llvm/`` within the lib directory. On Linux, this is typically
++  ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
+ 
+ * ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
+   ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
+diff --git a/include/llvm/CMakeLists.txt b/include/llvm/CMakeLists.txt
+index 1d5ca3ba92b0..026f5453c1da 100644
+--- a/include/llvm/CMakeLists.txt
++++ b/include/llvm/CMakeLists.txt
+@@ -4,5 +4,5 @@ add_subdirectory(Support)
+ # If we're doing an out-of-tree build, copy a module map for generated
+ # header files into the build area.
+ if (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+-  configure_file(module.modulemap.build module.modulemap COPYONLY)
++  configure_file(module.modulemap.build ${LLVM_INCLUDE_DIR}/module.modulemap COPYONLY)
+ endif (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
+index f201e1f7bff0..4582ed556a02 100644
+--- a/tools/llvm-config/BuildVariables.inc.in
++++ b/tools/llvm-config/BuildVariables.inc.in
+@@ -24,6 +24,10 @@
+ #define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
+ #define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
+ #define LLVM_LIBDIR_SUFFIX "@LLVM_LIBDIR_SUFFIX@"
++#define LLVM_INSTALL_BINDIR "@CMAKE_INSTALL_BINDIR@"
++#define LLVM_INSTALL_LIBDIR "@CMAKE_INSTALL_LIBDIR@"
++#define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
++#define LLVM_INSTALL_CMAKEDIR "@LLVM_INSTALL_CMAKE_DIR@"
+ #define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
+ #define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
+ #define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
+diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
+index 892adc3b9dd8..cabe7fcc630f 100644
+--- a/tools/llvm-config/llvm-config.cpp
++++ b/tools/llvm-config/llvm-config.cpp
+@@ -333,12 +333,26 @@ int main(int argc, char **argv) {
+         ("-I" + ActiveIncludeDir + " " + "-I" + ActiveObjRoot + "/include");
+   } else {
+     ActivePrefix = CurrentExecPrefix;
+-    ActiveIncludeDir = ActivePrefix + "/include";
+-    SmallString<256> path(StringRef(LLVM_TOOLS_INSTALL_DIR));
+-    sys::fs::make_absolute(ActivePrefix, path);
+-    ActiveBinDir = path.str();
+-    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
+-    ActiveCMakeDir = ActiveLibDir + "/cmake/llvm";
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_INCLUDEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveIncludeDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_BINDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveBinDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveLibDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_CMAKEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveCMakeDir = std::string(path.str());
++    }
+     ActiveIncludeOption = "-I" + ActiveIncludeDir;
+   }
+ 
+diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
+index 6e913519a809..85641eef721f 100644
+--- a/tools/lto/CMakeLists.txt
++++ b/tools/lto/CMakeLists.txt
+@@ -19,7 +19,7 @@ set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/lto.exports)
+ add_llvm_library(LTO SHARED ${SOURCES} DEPENDS intrinsics_gen)
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/lto.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT LTO)
+ 
+ if (APPLE)
+diff --git a/tools/opt-viewer/CMakeLists.txt b/tools/opt-viewer/CMakeLists.txt
+index 19b606933082..27b9f71b3d79 100644
+--- a/tools/opt-viewer/CMakeLists.txt
++++ b/tools/opt-viewer/CMakeLists.txt
+@@ -8,6 +8,6 @@ set (files
+ 
+ foreach (file ${files})
+   install(PROGRAMS ${file}
+-    DESTINATION share/opt-viewer
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/opt-viewer
+     COMPONENT opt-viewer)
+ endforeach (file)
diff --git a/pkgs/development/compilers/llvm/8/clang/default.nix b/pkgs/development/compilers/llvm/8/clang/default.nix
index 8f44ffc0615..c82b3e873e8 100644
--- a/pkgs/development/compilers/llvm/8/clang/default.nix
+++ b/pkgs/development/compilers/llvm/8/clang/default.nix
@@ -1,4 +1,5 @@
-{ lib, stdenv, fetch, cmake, libxml2, llvm, version, clang-tools-extra_src, python3, lld
+{ lib, stdenv, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+, buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
 , enablePolly ? false # TODO: get this info from llvm (passthru?)
@@ -23,18 +24,22 @@ let
       ++ lib.optional enableManpages python3.pkgs.sphinx
       ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-    buildInputs = [ libxml2 llvm lld ];
+    buildInputs = [ libxml2 libllvm ];
 
     cmakeFlags = [
       "-DCMAKE_CXX_FLAGS=-std=c++11"
       "-DCLANGD_BUILD_XPC=OFF"
       "-DLLVM_ENABLE_RTTI=ON"
+      "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
     ] ++ lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"
       "-DSPHINX_OUTPUT_MAN=ON"
       "-DSPHINX_OUTPUT_HTML=OFF"
       "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
     ] ++ lib.optionals enablePolly [
       "-DWITH_POLLY=ON"
       "-DLINK_POLLY_INTO_TOOLS=ON"
@@ -42,7 +47,7 @@ let
 
     patches = [
       ./purity.patch
-      ./clang-xpc.patch
+      ./xpc.patch
       # Backport for -static-pie, which the latter touches, and which is nice in
       # its own right.
       ./static-pie.patch
@@ -53,6 +58,7 @@ let
       ./compiler-rt-baremetal.patch
       # make clang -xhip use $PATH to find executables
       ./HIP-use-PATH-8.patch
+      ./gnu-install-dirs.patch
     ];
 
     postPatch = ''
@@ -69,12 +75,12 @@ let
         --replace "NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB" FALSE
     '';
 
-    outputs = [ "out" "lib" "python" ];
+    outputs = [ "out" "lib" "dev" "python" ];
 
     # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${llvm}/lib/LLVMgold.so ]; then
-        ln -sv ${llvm}/lib/LLVMgold.so $out/lib
+      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
+        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
       fi
 
       ln -sv $out/bin/clang $out/bin/cpp
@@ -91,11 +97,14 @@ let
       fi
       mv $out/share/clang/*.py $python/share/clang
       rm $out/bin/c-index-test
+
+      mkdir -p $dev/bin
+      cp bin/clang-tblgen $dev/bin
     '';
 
     passthru = {
       isClang = true;
-      inherit llvm;
+      inherit libllvm;
     };
 
     meta = {
diff --git a/pkgs/development/compilers/llvm/8/clang/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/8/clang/gnu-install-dirs.patch
new file mode 100644
index 00000000000..e4b9c3f8ddd
--- /dev/null
+++ b/pkgs/development/compilers/llvm/8/clang/gnu-install-dirs.patch
@@ -0,0 +1,290 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index c2016a45ca6b..9224797da0b5 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -9,6 +9,8 @@ endif()
+ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
+   project(Clang)
+ 
++  include(GNUInstallDirs)
++
+   # Rely on llvm-config.
+   set(CONFIG_OUTPUT)
+   if(LLVM_CONFIG)
+@@ -382,7 +384,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/clang include/clang-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.def"
+     PATTERN "*.h"
+@@ -391,7 +393,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "CMakeFiles" EXCLUDE
+     PATTERN "*.inc"
+@@ -399,7 +401,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(PROGRAMS utils/bash-autocomplete.sh
+-    DESTINATION share/clang
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+     )
+ endif()
+ 
+diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
+index 7e22f16f365b..3c0c1d245969 100644
+--- a/cmake/modules/AddClang.cmake
++++ b/cmake/modules/AddClang.cmake
+@@ -99,9 +99,9 @@ macro(add_clang_library name)
+       install(TARGETS ${name}
+         COMPONENT ${name}
+         ${export_to_clangtargets}
+-        LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        RUNTIME DESTINATION bin)
++        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+       if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+         add_llvm_install_targets(install-${name}
+@@ -142,7 +142,7 @@ macro(add_clang_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_clangtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -157,5 +157,5 @@ endmacro()
+ macro(add_clang_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
+index e444c9c8706f..f8e4d06366a4 100644
+--- a/lib/Headers/CMakeLists.txt
++++ b/lib/Headers/CMakeLists.txt
+@@ -164,19 +164,19 @@ install(
+   FILES ${files} ${CMAKE_CURRENT_BINARY_DIR}/arm_neon.h
+   COMPONENT clang-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ install(
+   FILES ${files} ${CMAKE_CURRENT_BINARY_DIR}/arm_fp16.h
+   COMPONENT clang-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ install(
+   FILES ${cuda_wrapper_files}
+   COMPONENT clang-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include/cuda_wrappers)
++  DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include/cuda_wrappers)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDE's.
+   add_llvm_install_targets(install-clang-headers
+diff --git a/tools/c-index-test/CMakeLists.txt b/tools/c-index-test/CMakeLists.txt
+index 53e3421f1b35..79ae5bb4c399 100644
+--- a/tools/c-index-test/CMakeLists.txt
++++ b/tools/c-index-test/CMakeLists.txt
+@@ -54,7 +54,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
+        "@executable_path/../../lib")
+   else()
+-    set(INSTALL_DESTINATION bin)
++    set(INSTALL_DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endif()
+ 
+   install(TARGETS c-index-test
+diff --git a/tools/clang-check/CMakeLists.txt b/tools/clang-check/CMakeLists.txt
+index b837b0a0a5d9..9e30bd5780a5 100644
+--- a/tools/clang-check/CMakeLists.txt
++++ b/tools/clang-check/CMakeLists.txt
+@@ -21,4 +21,4 @@ target_link_libraries(clang-check
+   )
+ 
+ install(TARGETS clang-check
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-extdef-mapping/CMakeLists.txt b/tools/clang-extdef-mapping/CMakeLists.txt
+index 6c81689a831a..dacc14737719 100644
+--- a/tools/clang-extdef-mapping/CMakeLists.txt
++++ b/tools/clang-extdef-mapping/CMakeLists.txt
+@@ -18,4 +18,4 @@ target_link_libraries(clang-extdef-mapping
+   )
+ 
+ install(TARGETS clang-extdef-mapping
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-format/CMakeLists.txt b/tools/clang-format/CMakeLists.txt
+index a295e8cd0b2a..1973ff82c7f6 100644
+--- a/tools/clang-format/CMakeLists.txt
++++ b/tools/clang-format/CMakeLists.txt
+@@ -21,20 +21,20 @@ if( LLVM_LIB_FUZZING_ENGINE OR LLVM_USE_SANITIZE_COVERAGE )
+ endif()
+ 
+ install(PROGRAMS clang-format-bbedit.applescript
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-diff.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-sublime.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS git-clang-format
+-  DESTINATION bin
++  DESTINATION ${CMAKE_INSTALL_BINDIR}
+   COMPONENT clang-format)
+diff --git a/tools/clang-offload-bundler/CMakeLists.txt b/tools/clang-offload-bundler/CMakeLists.txt
+index 8718015be76a..7a038f39622e 100644
+--- a/tools/clang-offload-bundler/CMakeLists.txt
++++ b/tools/clang-offload-bundler/CMakeLists.txt
+@@ -22,4 +22,4 @@ target_link_libraries(clang-offload-bundler
+   ${CLANG_OFFLOAD_BUNDLER_LIB_DEPS}
+   )
+ 
+-install(TARGETS clang-offload-bundler RUNTIME DESTINATION bin)
++install(TARGETS clang-offload-bundler RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-rename/CMakeLists.txt b/tools/clang-rename/CMakeLists.txt
+index 45cbd763425c..f534e022024a 100644
+--- a/tools/clang-rename/CMakeLists.txt
++++ b/tools/clang-rename/CMakeLists.txt
+@@ -19,8 +19,8 @@ target_link_libraries(clang-rename
+   )
+ 
+ install(PROGRAMS clang-rename.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+ install(PROGRAMS clang-rename.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+diff --git a/tools/diagtool/CMakeLists.txt b/tools/diagtool/CMakeLists.txt
+index 96d1c390249c..41c762b37b76 100644
+--- a/tools/diagtool/CMakeLists.txt
++++ b/tools/diagtool/CMakeLists.txt
+@@ -21,7 +21,7 @@ target_link_libraries(diagtool
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(TARGETS diagtool
+     COMPONENT diagtool
+-    RUNTIME DESTINATION bin)
++    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+   if (NOT CMAKE_CONFIGURATION_TYPES)
+     add_llvm_install_targets(install-diagtool
+diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
+index 32333b011ad1..258dfb2d520c 100644
+--- a/tools/libclang/CMakeLists.txt
++++ b/tools/libclang/CMakeLists.txt
+@@ -131,7 +131,7 @@ endif()
+ if(INTERNAL_INSTALL_PREFIX)
+   set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
+ else()
+-  set(LIBCLANG_HEADERS_INSTALL_DESTINATION include)
++  set(LIBCLANG_HEADERS_INSTALL_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+ endif()
+ 
+ install(DIRECTORY ../../include/clang-c
+@@ -162,7 +162,7 @@ foreach(PythonVersion ${CLANG_PYTHON_BINDINGS_VERSIONS})
+           COMPONENT
+             libclang-python-bindings
+           DESTINATION
+-            "lib${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
++            "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
+ endforeach()
+ if(NOT CMAKE_CONFIGURATION_TYPES)
+   add_custom_target(libclang-python-bindings)
+diff --git a/tools/scan-build/CMakeLists.txt b/tools/scan-build/CMakeLists.txt
+index 380379300b09..adfd58ed5f7d 100644
+--- a/tools/scan-build/CMakeLists.txt
++++ b/tools/scan-build/CMakeLists.txt
+@@ -41,7 +41,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/bin/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
++    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endforeach()
+ 
+   foreach(LibexecFile ${LibexecFiles})
+@@ -53,7 +53,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/libexec/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libexec/${LibexecFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/libexec/${LibexecFile})
+-    install(PROGRAMS libexec/${LibexecFile} DESTINATION libexec)
++    install(PROGRAMS libexec/${LibexecFile} DESTINATION ${CMAKE_INSTALL_LIBEXECDIR})
+   endforeach()
+ 
+   foreach(ManPage ${ManPages})
+@@ -77,7 +77,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/share/scan-build/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/scan-build/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-build/${ShareFile})
+-    install(FILES share/scan-build/${ShareFile} DESTINATION share/scan-build)
++    install(FILES share/scan-build/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-build)
+   endforeach()
+ 
+   add_custom_target(scan-build ALL DEPENDS ${Depends})
+diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
+index b305ca562a72..554bcb379061 100644
+--- a/tools/scan-view/CMakeLists.txt
++++ b/tools/scan-view/CMakeLists.txt
+@@ -21,7 +21,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                          ${CMAKE_BINARY_DIR}/bin/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
++    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endforeach()
+ 
+   foreach(ShareFile ${ShareFiles})
+@@ -33,7 +33,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                          ${CMAKE_BINARY_DIR}/share/scan-view/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-view/${ShareFile})
+-    install(FILES share/${ShareFile} DESTINATION share/scan-view)
++    install(FILES share/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-view)
+   endforeach()
+ 
+   add_custom_target(scan-view ALL DEPENDS ${Depends})
+diff --git a/utils/hmaptool/CMakeLists.txt b/utils/hmaptool/CMakeLists.txt
+index 5573009d343a..24b3a90f233f 100644
+--- a/utils/hmaptool/CMakeLists.txt
++++ b/utils/hmaptool/CMakeLists.txt
+@@ -9,7 +9,7 @@ add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HM
+                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${CLANG_HMAPTOOL})
+ 
+ list(APPEND Depends ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HMAPTOOL})
+-install(PROGRAMS ${CLANG_HMAPTOOL} DESTINATION bin)
++install(PROGRAMS ${CLANG_HMAPTOOL} DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ add_custom_target(hmaptool ALL DEPENDS ${Depends})
+ set_target_properties(hmaptool PROPERTIES FOLDER "Utils")
diff --git a/pkgs/development/compilers/llvm/8/clang/clang-xpc.patch b/pkgs/development/compilers/llvm/8/clang/xpc.patch
index eb57d345822..eb57d345822 100644
--- a/pkgs/development/compilers/llvm/8/clang/clang-xpc.patch
+++ b/pkgs/development/compilers/llvm/8/clang/xpc.patch
diff --git a/pkgs/development/compilers/llvm/8/compiler-rt/default.nix b/pkgs/development/compilers/llvm/8/compiler-rt/default.nix
index 3da3d59d111..d370de031bb 100644
--- a/pkgs/development/compilers/llvm/8/compiler-rt/default.nix
+++ b/pkgs/development/compilers/llvm/8/compiler-rt/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation {
   inherit version;
   src = fetch "compiler-rt" "0dqqf8f930l8gag4d9qjgn1n0pj0nbv2anviqqhdi1rkhas8z0hi";
 
-  nativeBuildInputs = [ cmake python3 llvm ];
+  nativeBuildInputs = [ cmake python3 llvm.dev ];
   buildInputs = lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
   NIX_CFLAGS_COMPILE = [
@@ -54,6 +54,7 @@ stdenv.mkDerivation {
     # https://github.com/llvm/llvm-project/commit/947f9692440836dcb8d88b74b69dd379d85974ce
     ../../common/compiler-rt/glibc.patch
     ./codesign.patch # Revert compiler-rt commit that makes codesign mandatory
+    ./gnu-install-dirs.patch
   ]# ++ lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
     ++ lib.optional (useLLVM) ./crtbegin-and-end.patch
     ++ lib.optional stdenv.hostPlatform.isAarch32 ./armv7l.patch;
diff --git a/pkgs/development/compilers/llvm/8/compiler-rt/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/8/compiler-rt/gnu-install-dirs.patch
new file mode 100644
index 00000000000..1c2e7f0b311
--- /dev/null
+++ b/pkgs/development/compilers/llvm/8/compiler-rt/gnu-install-dirs.patch
@@ -0,0 +1,117 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index aa360a3ef36e..a39676148181 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -8,6 +8,7 @@ cmake_minimum_required(VERSION 3.4.3)
+ # Check if compiler-rt is built as a standalone project.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR COMPILER_RT_STANDALONE_BUILD)
+   project(CompilerRT C CXX ASM)
++  include(GNUInstallDirs)
+   set(COMPILER_RT_STANDALONE_BUILD TRUE)
+   set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+ endif()
+diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake
+index 81b110203c27..df7598a11caf 100644
+--- a/cmake/Modules/AddCompilerRT.cmake
++++ b/cmake/Modules/AddCompilerRT.cmake
+@@ -479,7 +479,7 @@ macro(add_compiler_rt_resource_file target_name file_name component)
+   add_custom_target(${target_name} DEPENDS ${dst_file})
+   # Install in Clang resource directory.
+   install(FILES ${file_name}
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/share
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}
+     COMPONENT ${component})
+   add_dependencies(${component} ${target_name})
+ 
+@@ -496,7 +496,7 @@ macro(add_compiler_rt_script name)
+   add_custom_target(${name} DEPENDS ${dst})
+   install(FILES ${dst}
+     PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/bin)
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_BINDIR})
+ endmacro(add_compiler_rt_script src name)
+ 
+ # Builds custom version of libc++ and installs it in <prefix>.
+diff --git a/cmake/Modules/CompilerRTDarwinUtils.cmake b/cmake/Modules/CompilerRTDarwinUtils.cmake
+index 04cc955980fa..a99f6dfb2f82 100644
+--- a/cmake/Modules/CompilerRTDarwinUtils.cmake
++++ b/cmake/Modules/CompilerRTDarwinUtils.cmake
+@@ -377,7 +377,7 @@ macro(darwin_add_embedded_builtin_libraries)
+     set(DARWIN_macho_embedded_LIBRARY_OUTPUT_DIR
+       ${COMPILER_RT_OUTPUT_DIR}/lib/macho_embedded)
+     set(DARWIN_macho_embedded_LIBRARY_INSTALL_DIR
+-      ${COMPILER_RT_INSTALL_PATH}/lib/macho_embedded)
++      ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/macho_embedded)
+       
+     set(CFLAGS_armv7 "-target thumbv7-apple-darwin-eabi")
+     set(CFLAGS_i386 "-march=pentium")
+diff --git a/cmake/Modules/CompilerRTUtils.cmake b/cmake/Modules/CompilerRTUtils.cmake
+index 5348f2064b67..d7b8fe190789 100644
+--- a/cmake/Modules/CompilerRTUtils.cmake
++++ b/cmake/Modules/CompilerRTUtils.cmake
+@@ -363,7 +363,7 @@ endfunction()
+ function(get_compiler_rt_install_dir arch install_dir)
+   if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+     get_compiler_rt_target(${arch} target)
+-    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/${target}/lib PARENT_SCOPE)
++    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/${target}/${CMAKE_INSTALL_FULL_LIBDIR} PARENT_SCOPE)
+   else()
+     set(${install_dir} ${COMPILER_RT_LIBRARY_INSTALL_DIR} PARENT_SCOPE)
+   endif()
+diff --git a/cmake/base-config-ix.cmake b/cmake/base-config-ix.cmake
+index aeabf17653f5..0a927fbfc750 100644
+--- a/cmake/base-config-ix.cmake
++++ b/cmake/base-config-ix.cmake
+@@ -59,11 +59,11 @@ if (LLVM_TREE_AVAILABLE)
+ else()
+     # Take output dir and install path from the user.
+   set(COMPILER_RT_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH
+-    "Path where built compiler-rt libraries should be stored.")
++    "Path where built compiler-rt build artifacts should be stored.")
+   set(COMPILER_RT_EXEC_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/bin CACHE PATH
+     "Path where built compiler-rt executables should be stored.")
+-  set(COMPILER_RT_INSTALL_PATH ${CMAKE_INSTALL_PREFIX} CACHE PATH
+-    "Path where built compiler-rt libraries should be installed.")
++  set(COMPILER_RT_INSTALL_PATH "" CACHE PATH
++    "Prefix where built compiler-rt artifacts should be installed, comes before CMAKE_INSTALL_PREFIX.")
+   option(COMPILER_RT_INCLUDE_TESTS "Generate and build compiler-rt unit tests." OFF)
+   option(COMPILER_RT_ENABLE_WERROR "Fail and stop if warning is triggered" OFF)
+   # Use a host compiler to compile/link tests.
+@@ -91,7 +91,7 @@ else(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
+   set(COMPILER_RT_LIBRARY_OUTPUT_DIR
+     ${COMPILER_RT_OUTPUT_DIR}/lib/${COMPILER_RT_OS_DIR})
+   set(COMPILER_RT_LIBRARY_INSTALL_DIR
+-    ${COMPILER_RT_INSTALL_PATH}/lib/${COMPILER_RT_OS_DIR})
++    ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${COMPILER_RT_OS_DIR})
+ endif()
+ 
+ if(APPLE)
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index c4b93b89a30c..3913dc3a1ee6 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -48,12 +48,12 @@ set_target_properties(compiler-rt-headers PROPERTIES FOLDER "Compiler-RT Misc")
+ install(FILES ${SANITIZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/sanitizer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/sanitizer)
+ # Install xray headers.
+ install(FILES ${XRAY_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/xray)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/xray)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDEs.
+   add_custom_target(install-compiler-rt-headers
+diff --git a/lib/dfsan/CMakeLists.txt b/lib/dfsan/CMakeLists.txt
+index b3ae713cf02c..52b364b900f5 100644
+--- a/lib/dfsan/CMakeLists.txt
++++ b/lib/dfsan/CMakeLists.txt
+@@ -54,4 +54,4 @@ add_custom_command(OUTPUT ${dfsan_abilist_filename}
+                    DEPENDS done_abilist.txt libc_ubuntu1404_abilist.txt)
+ add_dependencies(dfsan dfsan_abilist)
+ install(FILES ${dfsan_abilist_filename}
+-        DESTINATION ${COMPILER_RT_INSTALL_PATH}/share)
++        DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_DATADIR})
diff --git a/pkgs/development/compilers/llvm/8/default.nix b/pkgs/development/compilers/llvm/8/default.nix
index 6d6d8b4f783..bcbbd155e36 100644
--- a/pkgs/development/compilers/llvm/8/default.nix
+++ b/pkgs/development/compilers/llvm/8/default.nix
@@ -1,6 +1,5 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, gccForLibs
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
-, buildPackages
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 }:
@@ -18,43 +17,52 @@ let
   clang-tools-extra_src = fetch "clang-tools-extra" "1qf3097bc5ia8p6cpmbx985rjr3yaah5s8fc0nv7pw742yv7jw8q";
 
   tools = lib.makeExtensible (tools: let
-    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch; });
-    mkExtraBuildCommands = cc: ''
+    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch buildLlvmTools; });
+    mkExtraBuildCommands0 = cc: ''
       rsrc="$out/resource-root"
       mkdir "$rsrc"
-      ln -s "${cc}/lib/clang/${release_version}/include" "$rsrc"
-      ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
+      ln -s "${cc.lib}/lib/clang/${release_version}/include" "$rsrc"
       echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
     '';
+    mkExtraBuildCommands = cc: mkExtraBuildCommands0 cc + ''
+      ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
+    '';
+
   in {
 
-    llvm = callPackage ./llvm { };
+    libllvm = callPackage ./llvm { };
+
+    # `llvm` historically had the binaries.  When choosing an output explicitly,
+    # we need to reintroduce `outputUnspecified` to get the expected behavior e.g. of lib.get*
+    llvm = tools.libllvm.out // { outputUnspecified = true; };
 
-    llvm-polly = callPackage ./llvm { enablePolly = true; };
+    libllvm-polly = callPackage ./llvm { enablePolly = true; };
 
-    clang-unwrapped = callPackage ./clang {
-      inherit (tools) lld;
+    llvm-polly = tools.libllvm-polly.lib // { outputUnspecified = true; };
+
+    libclang = callPackage ./clang {
       inherit clang-tools-extra_src;
     };
+
+    clang-unwrapped = tools.libclang.out // { outputUnspecified = true; };
+
     clang-polly-unwrapped = callPackage ./clang {
       inherit clang-tools-extra_src;
-      llvm = tools.llvm-polly;
+      libllvm = tools.libllvm-polly;
       enablePolly = true;
     };
 
     # disabled until recommonmark supports sphinx 3
-    #llvm-manpages = lowPrio (tools.llvm.override {
+    #llvm-manpages = lowPrio (tools.libllvm.override {
     #  enableManpages = true;
     #  python3 = pkgs.python3;  # don't use python-boot
     #});
 
-    clang-manpages = lowPrio (tools.clang-unwrapped.override {
+    clang-manpages = lowPrio (tools.libclang.override {
       enableManpages = true;
       python3 = pkgs.python3;  # don't use python-boot
     });
 
-    libclang = tools.clang-unwrapped.lib;
-
     clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
 
     libstdcxxClang = wrapCCWith rec {
@@ -144,7 +152,7 @@ let
       '' + mkExtraBuildCommands cc;
     };
 
-    lldClangNoCompilerRt = wrapCCWith {
+    lldClangNoCompilerRt = wrapCCWith rec {
       cc = tools.clang-unwrapped;
       libcxx = null;
       bintools = wrapBintoolsWith {
@@ -154,7 +162,7 @@ let
       extraPackages = [ ];
       extraBuildCommands = ''
         echo "-nostartfiles" >> $out/nix-support/cc-cflags
-      '';
+      '' + mkExtraBuildCommands0 cc;
     };
 
   });
diff --git a/pkgs/development/compilers/llvm/8/libc++/default.nix b/pkgs/development/compilers/llvm/8/libc++/default.nix
index 70e4d9e1a65..d73600b441d 100644
--- a/pkgs/development/compilers/llvm/8/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/8/libc++/default.nix
@@ -13,7 +13,11 @@ stdenv.mkDerivation {
     export LIBCXXABI_INCLUDE_DIR="$PWD/$(ls -d libcxxabi-${version}*)/include"
   '';
 
-  patches = lib.optional stdenv.hostPlatform.isMusl ../../libcxx-0001-musl-hacks.patch;
+  outputs = [ "out" "dev" ];
+
+  patches = [
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional stdenv.hostPlatform.isMusl ../../libcxx-0001-musl-hacks.patch;
 
   prePatch = ''
     substituteInPlace lib/CMakeLists.txt --replace "/usr/lib/libc++" "\''${LIBCXX_LIBCXXABI_LIB_PATH}/libc++"
diff --git a/pkgs/development/compilers/llvm/8/libc++/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/8/libc++/gnu-install-dirs.patch
new file mode 100644
index 00000000000..6af403ac86b
--- /dev/null
+++ b/pkgs/development/compilers/llvm/8/libc++/gnu-install-dirs.patch
@@ -0,0 +1,72 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 6b83bce1ae72..63cda3e4e80c 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -26,6 +26,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   project(libcxx CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxx)
+   set(PACKAGE_VERSION 8.0.1)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+diff --git a/cmake/Modules/HandleLibCXXABI.cmake b/cmake/Modules/HandleLibCXXABI.cmake
+index 1c19d7e01af7..9c8aee8e8bb7 100644
+--- a/cmake/Modules/HandleLibCXXABI.cmake
++++ b/cmake/Modules/HandleLibCXXABI.cmake
+@@ -59,7 +59,7 @@ macro(setup_abi_lib abidefines abilib abifiles abidirs)
+ 
+         if (LIBCXX_INSTALL_HEADERS)
+           install(FILES "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}"
+-            DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1/${dstdir}
++            DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dstdir}
+             COMPONENT cxx-headers
+             PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+             )
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index 73f7cfc4d8e3..92cf0864ac7e 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -243,7 +243,7 @@ if (LIBCXX_INSTALL_HEADERS)
+   foreach(file ${files})
+     get_filename_component(dir ${file} DIRECTORY)
+     install(FILES ${file}
+-      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1/${dir}
++      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dir}
+       COMPONENT cxx-headers
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+     )
+@@ -252,7 +252,7 @@ if (LIBCXX_INSTALL_HEADERS)
+   if (LIBCXX_NEEDS_SITE_CONFIG)
+     # Install the generated header as __config.
+     install(FILES ${LIBCXX_BINARY_DIR}/__generated_config
+-      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1
++      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+       RENAME __config
+       COMPONENT cxx-headers)
+diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
+index 24489e8fb5e8..7327e5ee4b85 100644
+--- a/lib/CMakeLists.txt
++++ b/lib/CMakeLists.txt
+@@ -414,8 +414,8 @@ if (LIBCXX_INSTALL_LIBRARY)
+     set(experimental_lib cxx_experimental)
+   endif()
+   install(TARGETS ${LIBCXX_INSTALL_TARGETS} ${filesystem_lib} ${experimental_lib}
+-    LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
+-    ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
++    LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
++    ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX} COMPONENT cxx
+     )
+   # NOTE: This install command must go after the cxx install command otherwise
+   # it will not be executed after the library symlinks are installed.
+@@ -423,7 +423,7 @@ if (LIBCXX_INSTALL_LIBRARY)
+     # Replace the libc++ filename with $<TARGET_LINKER_FILE:cxx>
+     # after we required CMake 3.0.
+     install(FILES "${LIBCXX_LIBRARY_DIR}/libc++${CMAKE_SHARED_LIBRARY_SUFFIX}"
+-      DESTINATION ${LIBCXX_INSTALL_PREFIX}lib${LIBCXX_LIBDIR_SUFFIX}
++      DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX}
+       COMPONENT libcxx)
+   endif()
+ endif()
diff --git a/pkgs/development/compilers/llvm/8/libc++abi/default.nix b/pkgs/development/compilers/llvm/8/libc++abi/default.nix
index bde67f86640..5659bb4f14a 100644
--- a/pkgs/development/compilers/llvm/8/libc++abi/default.nix
+++ b/pkgs/development/compilers/llvm/8/libc++abi/default.nix
@@ -8,20 +8,7 @@ stdenv.mkDerivation {
 
   src = fetch "libcxxabi" "1vznz8n1z1h8af0ga451m98lc2hjnv4fyzl71napsvjhvk4g6nxp";
 
-  nativeBuildInputs = [ cmake ];
-  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD && !stdenv.hostPlatform.isWasm) libunwind;
-
-  cmakeFlags = lib.optionals (stdenv.hostPlatform.useLLVM or false) [
-    "-DLLVM_ENABLE_LIBCXX=ON"
-    "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
-  ] ++ lib.optionals stdenv.hostPlatform.isWasm [
-    "-DLIBCXXABI_ENABLE_THREADS=OFF"
-    "-DLIBCXXABI_ENABLE_EXCEPTIONS=OFF"
-  ] ++ lib.optionals (!enableShared) [
-    "-DLIBCXXABI_ENABLE_SHARED=OFF"
-  ];
-
-  patches = [ ./no-threads.patch ];
+  outputs = [ "out" "dev" ];
 
   postUnpack = ''
     unpackFile ${libcxx.src}
@@ -35,6 +22,24 @@ stdenv.mkDerivation {
     patch -p1 -d $(ls -d llvm-*) -i ${./wasm.patch}
   '';
 
+  patches = [
+    ./no-threads.patch
+    ./gnu-install-dirs.patch
+  ];
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD && !stdenv.hostPlatform.isWasm) libunwind;
+
+  cmakeFlags = lib.optionals (stdenv.hostPlatform.useLLVM or false) [
+    "-DLLVM_ENABLE_LIBCXX=ON"
+    "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
+  ] ++ lib.optionals stdenv.hostPlatform.isWasm [
+    "-DLIBCXXABI_ENABLE_THREADS=OFF"
+    "-DLIBCXXABI_ENABLE_EXCEPTIONS=OFF"
+  ] ++ lib.optionals (!enableShared) [
+    "-DLIBCXXABI_ENABLE_SHARED=OFF"
+  ];
+
   installPhase = if stdenv.isDarwin
     then ''
       for file in lib/*.dylib; do
diff --git a/pkgs/development/compilers/llvm/8/libc++abi/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/8/libc++abi/gnu-install-dirs.patch
new file mode 100644
index 00000000000..3f924b0efbe
--- /dev/null
+++ b/pkgs/development/compilers/llvm/8/libc++abi/gnu-install-dirs.patch
@@ -0,0 +1,28 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 92c7dc5dc557..556b3e05a042 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -20,6 +20,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   project(libcxxabi CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxxabi)
+   set(PACKAGE_VERSION 8.0.0)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index 7e21fb2d7926..30711099a19c 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -220,8 +220,8 @@ add_custom_target(cxxabi DEPENDS ${LIBCXXABI_BUILD_TARGETS})
+ 
+ if (LIBCXXABI_INSTALL_LIBRARY)
+   install(TARGETS ${LIBCXXABI_INSTALL_TARGETS}
+-    LIBRARY DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
+-    ARCHIVE DESTINATION ${LIBCXXABI_INSTALL_PREFIX}lib${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
++    LIBRARY DESTINATION ${LIBCXXABI_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
++    ARCHIVE DESTINATION ${LIBCXXABI_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX} COMPONENT cxxabi
+     )
+ endif()
+ 
diff --git a/pkgs/development/compilers/llvm/8/libunwind/default.nix b/pkgs/development/compilers/llvm/8/libunwind/default.nix
index d1bd54fbd34..e38f2072ced 100644
--- a/pkgs/development/compilers/llvm/8/libunwind/default.nix
+++ b/pkgs/development/compilers/llvm/8/libunwind/default.nix
@@ -2,13 +2,11 @@
 , enableShared ? !stdenv.hostPlatform.isStatic
 }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "libunwind";
   inherit version;
 
-  src = fetch "libunwind" "0vhgcgzsb33l83qaikrkj87ypqb48mi607rccczccwiiv8ficw0q";
-
-  nativeBuildInputs = [ cmake ];
+  src = fetch pname "0vhgcgzsb33l83qaikrkj87ypqb48mi607rccczccwiiv8ficw0q";
 
   patches = [
     (fetchpatch {
@@ -19,7 +17,12 @@ stdenv.mkDerivation {
       url = "https://github.com/llvm-mirror/libunwind/commit/e050272d2eb57eb4e56a37b429a61df2ebb8aa3e.patch";
       sha256 = "1sxyx5xnax8k713jjcxgq3jq3cpnxygs2rcdf5vfja0f2k9jzldl";
     })
+    ./gnu-install-dirs.patch
   ];
 
+  outputs = [ "out" "dev" ];
+
+  nativeBuildInputs = [ cmake ];
+
   cmakeFlags = lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF";
 }
diff --git a/pkgs/development/compilers/llvm/8/libunwind/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/8/libunwind/gnu-install-dirs.patch
new file mode 100644
index 00000000000..ffabba8137d
--- /dev/null
+++ b/pkgs/development/compilers/llvm/8/libunwind/gnu-install-dirs.patch
@@ -0,0 +1,28 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 3d06073cfe74..55c7d1635fcd 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -18,6 +18,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   project(libunwind)
+ 
++  include(GNUInstallDirs)
++
+   # Rely on llvm-config.
+   set(CONFIG_OUTPUT)
+   if(NOT LLVM_CONFIG_PATH)
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index f7523f88b6ac..4060dad214de 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -151,8 +151,8 @@ add_custom_target(unwind DEPENDS ${LIBUNWIND_BUILD_TARGETS})
+ 
+ if (LIBUNWIND_INSTALL_LIBRARY)
+   install(TARGETS ${LIBUNWIND_INSTALL_TARGETS}
+-    LIBRARY DESTINATION ${LIBUNWIND_INSTALL_PREFIX}lib${LIBUNWIND_LIBDIR_SUFFIX} COMPONENT unwind
+-    ARCHIVE DESTINATION ${LIBUNWIND_INSTALL_PREFIX}lib${LIBUNWIND_LIBDIR_SUFFIX} COMPONENT unwind)
++    LIBRARY DESTINATION ${LIBUNWIND_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX} COMPONENT unwind
++    ARCHIVE DESTINATION ${LIBUNWIND_INSTALL_PREFIX}${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX} COMPONENT unwind)
+ endif()
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES AND LIBUNWIND_INSTALL_LIBRARY)
diff --git a/pkgs/development/compilers/llvm/8/lld/default.nix b/pkgs/development/compilers/llvm/8/lld/default.nix
index 8009beb7bc1..696403d1bf6 100644
--- a/pkgs/development/compilers/llvm/8/lld/default.nix
+++ b/pkgs/development/compilers/llvm/8/lld/default.nix
@@ -1,8 +1,9 @@
 { lib, stdenv
+, buildLlvmTools
 , fetch
 , cmake
 , libxml2
-, llvm
+, libllvm
 , version
 }:
 
@@ -12,15 +13,20 @@ stdenv.mkDerivation {
 
   src = fetch "lld" "121xhxrlvwy3k5nf6p1wv31whxlb635ssfkci8z93mwv4ja1xflz";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ llvm libxml2 ];
+  buildInputs = [ libllvm libxml2 ];
 
-  outputs = [ "out" "dev" ];
+  cmakeFlags = [
+    "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
+  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+  ];
 
-  postInstall = ''
-    moveToOutput include "$dev"
-    moveToOutput lib "$dev"
-  '';
+  outputs = [ "out" "lib" "dev" ];
 
   meta = {
     description = "The LLVM Linker";
diff --git a/pkgs/development/compilers/llvm/8/lld/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/8/lld/gnu-install-dirs.patch
new file mode 100644
index 00000000000..acc2d3d4776
--- /dev/null
+++ b/pkgs/development/compilers/llvm/8/lld/gnu-install-dirs.patch
@@ -0,0 +1,68 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index e2fbdbfbbb47..d601b231ebb8 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -6,6 +6,8 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   set(CMAKE_INCLUDE_CURRENT_DIR ON)
+   set(LLD_BUILT_STANDALONE TRUE)
+ 
++  include(GNUInstallDirs)
++
+   find_program(LLVM_CONFIG_PATH "llvm-config" DOC "Path to llvm-config binary")
+   if(NOT LLVM_CONFIG_PATH)
+     message(FATAL_ERROR "llvm-config not found: specify LLVM_CONFIG_PATH")
+@@ -203,7 +205,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/cmake/modules/AddLLD.cmake b/cmake/modules/AddLLD.cmake
+index fa48b428d26b..e7967aad3ceb 100644
+--- a/cmake/modules/AddLLD.cmake
++++ b/cmake/modules/AddLLD.cmake
+@@ -20,9 +20,9 @@ macro(add_lld_library name)
+     install(TARGETS ${name}
+       COMPONENT ${name}
+       ${export_to_lldtargets}
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      RUNTIME DESTINATION bin)
++      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+     if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+       add_llvm_install_targets(install-${name}
+@@ -54,7 +54,7 @@ macro(add_lld_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_lldtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -69,5 +69,5 @@ endmacro()
+ macro(add_lld_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/tools/lld/CMakeLists.txt b/tools/lld/CMakeLists.txt
+index d8829493fc22..df748a0e749b 100644
+--- a/tools/lld/CMakeLists.txt
++++ b/tools/lld/CMakeLists.txt
+@@ -16,7 +16,7 @@ target_link_libraries(lld
+   )
+ 
+ install(TARGETS lld
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ if(NOT LLD_SYMLINKS_TO_CREATE)
+   set(LLD_SYMLINKS_TO_CREATE lld-link ld.lld ld64.lld wasm-ld)
diff --git a/pkgs/development/compilers/llvm/8/lldb/default.nix b/pkgs/development/compilers/llvm/8/lldb/default.nix
index 83c171d2a57..95bf4aae054 100644
--- a/pkgs/development/compilers/llvm/8/lldb/default.nix
+++ b/pkgs/development/compilers/llvm/8/lldb/default.nix
@@ -7,47 +7,67 @@
 , which
 , libedit
 , libxml2
-, llvm
-, clang-unwrapped
+, libllvm
+, libclang
 , python3
 , version
 , darwin
 }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "lldb";
   inherit version;
 
   src = fetch "lldb" "1mriw4adrwm6kzabrjr7yqmdiylxd6glf6samd80dp8idnm9p9z8";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
   postPatch = ''
     # Fix up various paths that assume llvm and clang are installed in the same place
-    sed -i 's,".*ClangConfig.cmake","${clang-unwrapped}/lib/cmake/clang/ClangConfig.cmake",' \
+    sed -i 's,".*ClangConfig.cmake","${libclang.dev}/lib/cmake/clang/ClangConfig.cmake",' \
       cmake/modules/LLDBStandalone.cmake
-    sed -i 's,".*tools/clang/include","${clang-unwrapped}/include",' \
+    sed -i 's,".*tools/clang/include","${libclang.dev}/include",' \
       cmake/modules/LLDBStandalone.cmake
-    sed -i 's,"$.LLVM_LIBRARY_DIR.",${llvm}/lib ${clang-unwrapped}/lib,' \
+    sed -i 's,"$.LLVM_LIBRARY_DIR.",${libllvm.lib}/lib ${libclang.lib}/lib,' \
       cmake/modules/LLDBStandalone.cmake
   '';
 
-  nativeBuildInputs = [ cmake python3 which swig ];
-  buildInputs = [ ncurses zlib libedit libxml2 llvm ]
-    ++ lib.optionals stdenv.isDarwin [ darwin.libobjc darwin.apple_sdk.libs.xpc darwin.apple_sdk.frameworks.Foundation darwin.bootstrap_cmds darwin.apple_sdk.frameworks.Carbon darwin.apple_sdk.frameworks.Cocoa ];
+  outputs = [ "out" "lib" "dev" ];
+
+  nativeBuildInputs = [
+    cmake python3 which swig
+  ];
+
+  buildInputs = [
+    ncurses zlib libedit libxml2 libllvm
+  ] ++ lib.optionals stdenv.isDarwin [
+    darwin.libobjc
+    darwin.apple_sdk.libs.xpc
+    darwin.apple_sdk.frameworks.Foundation darwin.bootstrap_cmds darwin.apple_sdk.frameworks.Carbon darwin.apple_sdk.frameworks.Cocoa
+  ];
 
   CXXFLAGS = "-fno-rtti";
   hardeningDisable = [ "format" ];
 
   cmakeFlags = [
+    "-DLLDB_INCLUDE_TESTS=${if doCheck then "YES" else "NO"}"
     "-DLLDB_CODESIGN_IDENTITY=" # codesigning makes nondeterministic
+  ] ++ lib.optionals doCheck [
+    "-DLLDB_TEST_C_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
+    "-DLLDB_TEST_CXX_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++"
   ];
 
+  doCheck = false;
+
   postInstall = ''
     mkdir -p $out/share/man/man1
     cp ../docs/lldb.1 $out/share/man/man1/
 
     install -D ../tools/lldb-vscode/package.json $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/package.json
-    mkdir $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
-    ln -s $out/bin/lldb-vscode $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
+    mkdir -p $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
+    ln -s $out/bin/llvm-vscode $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
   '';
 
   meta = with lib; {
diff --git a/pkgs/development/compilers/llvm/8/lldb/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/8/lldb/gnu-install-dirs.patch
new file mode 100644
index 00000000000..b2e79086bed
--- /dev/null
+++ b/pkgs/development/compilers/llvm/8/lldb/gnu-install-dirs.patch
@@ -0,0 +1,81 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index cdf22c4b0fc8..8def776f2b4a 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -7,6 +7,8 @@ set(CMAKE_MODULE_PATH
+   "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules"
+   )
+ 
++include(GNUInstallDirs)
++
+ include(LLDBStandalone)
+ include(LLDBConfig)
+ include(AddLLDB)
+diff --git a/cmake/modules/AddLLDB.cmake b/cmake/modules/AddLLDB.cmake
+index f82c11d3d317..776e6d6ef9de 100644
+--- a/cmake/modules/AddLLDB.cmake
++++ b/cmake/modules/AddLLDB.cmake
+@@ -63,18 +63,18 @@ function(add_lldb_library name)
+             set(install_dir ".")
+           endif()
+         else()
+-          set(install_dir lib${LLVM_LIBDIR_SUFFIX})
++          set(install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+         endif()
+         install(TARGETS ${name}
+           COMPONENT ${name}
+-          RUNTIME DESTINATION bin
++          RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+           LIBRARY DESTINATION ${install_dir}
+           ARCHIVE DESTINATION ${install_dir})
+       else()
+         install(TARGETS ${name}
+           COMPONENT ${name}
+-          LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-          ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++          LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++          ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+       endif()
+       if (NOT CMAKE_CONFIGURATION_TYPES)
+         add_llvm_install_targets(install-${name}
+@@ -122,7 +122,7 @@ function(add_lldb_executable name)
+   if(ARG_GENERATE_INSTALL)
+     install(TARGETS ${name}
+             COMPONENT ${name}
+-            RUNTIME DESTINATION bin)
++            RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+     if (NOT CMAKE_CONFIGURATION_TYPES)
+       add_llvm_install_targets(install-${name}
+                                DEPENDS ${name}
+diff --git a/cmake/modules/LLDBConfig.cmake b/cmake/modules/LLDBConfig.cmake
+index 109c5132d3be..8b9092faa29d 100644
+--- a/cmake/modules/LLDBConfig.cmake
++++ b/cmake/modules/LLDBConfig.cmake
+@@ -319,7 +319,7 @@ include_directories(BEFORE
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+@@ -329,7 +329,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/tools/intel-features/CMakeLists.txt b/tools/intel-features/CMakeLists.txt
+index b5316540fdf3..3c3c882d503f 100644
+--- a/tools/intel-features/CMakeLists.txt
++++ b/tools/intel-features/CMakeLists.txt
+@@ -64,4 +64,4 @@ if (NOT LLDB_DISABLE_PYTHON AND LLDB_BUILD_INTEL_PT)
+ endif()
+ 
+ install(TARGETS lldbIntelFeatures
+-  LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
diff --git a/pkgs/development/compilers/llvm/8/llvm/default.nix b/pkgs/development/compilers/llvm/8/llvm/default.nix
index c0b88e7ff3e..8ea9b287c7c 100644
--- a/pkgs/development/compilers/llvm/8/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/8/llvm/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv
+, pkgsBuildBuild
 , fetch
 , fetchpatch
 , cmake
@@ -11,10 +12,10 @@
 , version
 , release_version
 , zlib
-, buildPackages
+, buildLlvmTools
 , debugVersion ? false
 , enableManpages ? false
-, enableSharedLibraries ? true
+, enableSharedLibraries ? !stdenv.hostPlatform.isStatic
 , enablePFM ? !(stdenv.isDarwin
   || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
   || stdenv.isAarch32 # broken for the armv7l builder
@@ -45,8 +46,7 @@ in stdenv.mkDerivation ({
     mv polly-* $sourceRoot/tools/polly
   '';
 
-  outputs = [ "out" "python" ]
-    ++ optional enableSharedLibraries "lib";
+  outputs = [ "out" "lib" "dev" "python" ];
 
   nativeBuildInputs = [ cmake python3 ]
     ++ optionals enableManpages [ python3.pkgs.sphinx python3.pkgs.recommonmark ];
@@ -62,12 +62,13 @@ in stdenv.mkDerivation ({
       url = "https://bugs.gentoo.org/attachment.cgi?id=612792";
       sha256 = "0rwx6jpqq4xnf4mvfm8v2d4r34y1yi05am0mx5k2d5bha9j64lqg";
     })
-  ];
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
 
   postPatch = optionalString stdenv.isDarwin ''
     substituteInPlace cmake/modules/AddLLVM.cmake \
       --replace 'set(_install_name_dir INSTALL_NAME_DIR "@rpath")' "set(_install_name_dir)" \
-      --replace 'set(_install_rpath "@loader_path/../lib" ''${extra_libdir})' ""
+      --replace 'set(_install_rpath "@loader_path/../''${CMAKE_INSTALL_LIBDIR}" ''${extra_libdir})' ""
   ''
   # Patch llvm-config to return correct library path based on --link-{shared,static}.
   + optionalString (enableSharedLibraries) ''
@@ -96,6 +97,7 @@ in stdenv.mkDerivation ({
   '';
 
   cmakeFlags = with stdenv; [
+    "-DLLVM_INSTALL_CMAKE_DIR=${placeholder "dev"}/lib/cmake/llvm/"
     "-DCMAKE_BUILD_TYPE=${if debugVersion then "Debug" else "Release"}"
     "-DLLVM_INSTALL_UTILS=ON"  # Needed by rustc
     "-DLLVM_BUILD_TESTS=ON"
@@ -119,7 +121,20 @@ in stdenv.mkDerivation ({
     "-DCAN_TARGET_i386=false"
   ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
     "-DCMAKE_CROSSCOMPILING=True"
-    "-DLLVM_TABLEGEN=${buildPackages.llvm_8}/bin/llvm-tblgen"
+    "-DLLVM_TABLEGEN=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+    (
+      let
+        nativeCC = pkgsBuildBuild.targetPackages.stdenv.cc;
+        nativeBintools = nativeCC.bintools.bintools;
+        nativeToolchainFlags = [
+          "-DCMAKE_C_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}cc"
+          "-DCMAKE_CXX_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}c++"
+          "-DCMAKE_AR=${nativeBintools}/bin/${nativeBintools.targetPrefix}ar"
+          "-DCMAKE_STRIP=${nativeBintools}/bin/${nativeBintools.targetPrefix}strip"
+          "-DCMAKE_RANLIB=${nativeBintools}/bin/${nativeBintools.targetPrefix}ranlib"
+        ];
+      in "-DCROSS_TOOLCHAIN_FLAGS_NATIVE:list=${lib.concatStringsSep ";" nativeToolchainFlags}"
+    )
   ];
 
   postBuild = ''
@@ -133,18 +148,19 @@ in stdenv.mkDerivation ({
   postInstall = ''
     mkdir -p $python/share
     mv $out/share/opt-viewer $python/share/opt-viewer
-  ''
-  + optionalString enableSharedLibraries ''
-    moveToOutput "lib/libLLVM-*" "$lib"
-    moveToOutput "lib/libLLVM${stdenv.hostPlatform.extensions.sharedLibrary}" "$lib"
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM-" "$lib/lib/libLLVM-"
+    moveToOutput "bin/llvm-config*" "$dev"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
+      --replace "\''${_IMPORT_PREFIX}/lib/lib" "$lib/lib/lib" \
+      --replace "$out/bin/llvm-config" "$dev/bin/llvm-config"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMConfig.cmake" \
+      --replace 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}")' 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}'"$lib"'")'
   ''
   + optionalString (stdenv.isDarwin && enableSharedLibraries) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM.dylib" "$lib/lib/libLLVM.dylib"
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${shortVersion}.dylib
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${release_version}.dylib
+  ''
+  + optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    cp NATIVE/bin/llvm-config $dev/bin/llvm-config-native
   '';
 
   doCheck = stdenv.isLinux && (!stdenv.isx86_32);
diff --git a/pkgs/development/compilers/llvm/8/llvm/gnu-install-dirs-polly.patch b/pkgs/development/compilers/llvm/8/llvm/gnu-install-dirs-polly.patch
new file mode 100644
index 00000000000..7c477c7df58
--- /dev/null
+++ b/pkgs/development/compilers/llvm/8/llvm/gnu-install-dirs-polly.patch
@@ -0,0 +1,106 @@
+diff --git a/tools/polly/CMakeLists.txt b/tools/polly/CMakeLists.txt
+index 9939097f743e..8cc538da912a 100644
+--- a/tools/polly/CMakeLists.txt
++++ b/tools/polly/CMakeLists.txt
+@@ -2,7 +2,11 @@
+ if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   project(Polly)
+   cmake_minimum_required(VERSION 3.4.3)
++endif()
++
++include(GNUInstallDirs)
+ 
++if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   # Where is LLVM installed?
+   find_package(LLVM CONFIG REQUIRED)
+   set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+@@ -145,14 +149,14 @@ include_directories(
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+     )
+ 
+   install(DIRECTORY ${POLLY_BINARY_DIR}/include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN "CMakeFiles" EXCLUDE
+diff --git a/tools/polly/cmake/CMakeLists.txt b/tools/polly/cmake/CMakeLists.txt
+index 211f95512717..f9e04a4844b6 100644
+--- a/tools/polly/cmake/CMakeLists.txt
++++ b/tools/polly/cmake/CMakeLists.txt
+@@ -79,18 +79,18 @@ file(GENERATE
+ 
+ # Generate PollyConfig.cmake for the install tree.
+ unset(POLLY_EXPORTS)
+-set(POLLY_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
++set(POLLY_INSTALL_PREFIX "")
+ set(POLLY_CONFIG_LLVM_CMAKE_DIR "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}")
++set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
++set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+ if (POLLY_BUNDLED_ISL)
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
+-    "${POLLY_INSTALL_PREFIX}/include/polly"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}/polly"
+     )
+ else()
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+     ${ISL_INCLUDE_DIRS}
+     )
+ endif()
+@@ -100,12 +100,12 @@ endif()
+ foreach(tgt IN LISTS POLLY_CONFIG_EXPORTED_TARGETS)
+   get_target_property(tgt_type ${tgt} TYPE)
+   if (tgt_type STREQUAL "EXECUTABLE")
+-    set(tgt_prefix "bin/")
++    set(tgt_prefix "${CMAKE_INSTALL_BINDIR}/")
+   else()
+-    set(tgt_prefix "lib/")
++    set(tgt_prefix "${CMAKE_INSTALL_LIBDIR}/")
+   endif()
+ 
+-  set(tgt_path "${CMAKE_INSTALL_PREFIX}/${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
++  set(tgt_path "${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
+   file(RELATIVE_PATH tgt_path ${POLLY_CONFIG_CMAKE_DIR} ${tgt_path})
+ 
+   if (NOT tgt_type STREQUAL "INTERFACE_LIBRARY")
+diff --git a/tools/polly/cmake/polly_macros.cmake b/tools/polly/cmake/polly_macros.cmake
+index e48203871884..5bc8a2a52541 100644
+--- a/tools/polly/cmake/polly_macros.cmake
++++ b/tools/polly/cmake/polly_macros.cmake
+@@ -44,8 +44,8 @@ macro(add_polly_library name)
+   if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LLVMPolly")
+     install(TARGETS ${name}
+       EXPORT LLVMExports
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++	  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   endif()
+   set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+ endmacro(add_polly_library)
+diff --git a/tools/polly/lib/External/CMakeLists.txt b/tools/polly/lib/External/CMakeLists.txt
+index 8ffd984e542b..261cc19f3238 100644
+--- a/tools/polly/lib/External/CMakeLists.txt
++++ b/tools/polly/lib/External/CMakeLists.txt
+@@ -274,7 +274,7 @@ if (POLLY_BUNDLED_ISL)
+     install(DIRECTORY
+       ${ISL_SOURCE_DIR}/include/
+       ${ISL_BINARY_DIR}/include/
+-      DESTINATION include/polly
++      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/polly
+       FILES_MATCHING
+       PATTERN "*.h"
+       PATTERN "CMakeFiles" EXCLUDE
diff --git a/pkgs/development/compilers/llvm/8/llvm/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/8/llvm/gnu-install-dirs.patch
new file mode 100644
index 00000000000..027e43f7cac
--- /dev/null
+++ b/pkgs/development/compilers/llvm/8/llvm/gnu-install-dirs.patch
@@ -0,0 +1,394 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 81c2bab39ec9..075e68be6125 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -251,15 +251,21 @@ if (CMAKE_BUILD_TYPE AND
+   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+ endif()
+ 
++include(GNUInstallDirs)
++
+ set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
+ 
+-set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
++set(LLVM_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE STRING
++    "Path for binary subdirectory (defaults to 'bin')")
+ mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+ 
+ set(LLVM_UTILS_INSTALL_DIR "${LLVM_TOOLS_INSTALL_DIR}" CACHE STRING
+     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
+ mark_as_advanced(LLVM_UTILS_INSTALL_DIR)
+ 
++set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
++	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
++
+ # They are used as destination of target generators.
+ set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
+ set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
+@@ -517,9 +523,9 @@ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
+ option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
+ option (LLVM_ENABLE_BINDINGS "Build bindings." ON)
+ 
+-set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
++set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html"
+     CACHE STRING "Doxygen-generated HTML documentation install directory")
+-set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
++set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html"
+     CACHE STRING "OCamldoc-generated HTML documentation install directory")
+ 
+ option (LLVM_BUILD_EXTERNAL_COMPILER_RT
+@@ -956,7 +962,7 @@ endif()
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/llvm include/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -968,7 +974,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm ${LLVM_INCLUDE_DIR}/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -983,13 +989,13 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   if (LLVM_INSTALL_MODULEMAPS)
+     install(DIRECTORY include/llvm include/llvm-c
+-            DESTINATION include
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+             COMPONENT llvm-headers
+             FILES_MATCHING
+             PATTERN "module.modulemap"
+             )
+     install(FILES include/llvm/module.install.modulemap
+-            DESTINATION include/llvm
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm
+             COMPONENT llvm-headers
+             RENAME "module.extern.modulemap"
+             )
+diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
+index 1a417447278b..0c2aef338078 100644
+--- a/cmake/modules/AddLLVM.cmake
++++ b/cmake/modules/AddLLVM.cmake
+@@ -646,11 +646,11 @@ macro(add_llvm_library name)
+     if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LTO" OR
+         ${name} STREQUAL "OptRemarks" OR
+         (LLVM_LINK_LLVM_DYLIB AND ${name} STREQUAL "LLVM"))
+-      set(install_dir lib${LLVM_LIBDIR_SUFFIX})
++      set(install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+       if(ARG_MODULE OR ARG_SHARED OR BUILD_SHARED_LIBS)
+         if(WIN32 OR CYGWIN OR MINGW)
+           set(install_type RUNTIME)
+-          set(install_dir bin)
++          set(install_dir ${CMAKE_INSTALL_BINDIR})
+         else()
+           set(install_type LIBRARY)
+         endif()
+@@ -898,7 +898,7 @@ macro(add_llvm_example name)
+   endif()
+   add_llvm_executable(${name} ${ARGN})
+   if( LLVM_BUILD_EXAMPLES )
+-    install(TARGETS ${name} RUNTIME DESTINATION examples)
++    install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   endif()
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endmacro(add_llvm_example name)
+@@ -1442,7 +1442,7 @@ function(llvm_install_library_symlink name dest type)
+   set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
+   set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
+ 
+-  set(output_dir lib${LLVM_LIBDIR_SUFFIX})
++  set(output_dir ${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   if(WIN32 AND "${type}" STREQUAL "SHARED")
+     set(output_dir bin)
+   endif()
+@@ -1458,7 +1458,7 @@ function(llvm_install_library_symlink name dest type)
+   endif()
+ endfunction()
+ 
+-function(llvm_install_symlink name dest)
++function(llvm_install_symlink name dest output_dir)
+   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
+   foreach(path ${CMAKE_MODULE_PATH})
+     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
+@@ -1481,7 +1481,7 @@ function(llvm_install_symlink name dest)
+   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
+ 
+   install(SCRIPT ${INSTALL_SYMLINK}
+-          CODE "install_symlink(${full_name} ${full_dest} ${LLVM_TOOLS_INSTALL_DIR})"
++          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+           COMPONENT ${component})
+ 
+   if (NOT LLVM_ENABLE_IDE AND NOT ARG_ALWAYS_GENERATE)
+@@ -1563,7 +1563,8 @@ function(add_llvm_tool_symlink link_name target)
+     endif()
+ 
+     if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
+-      llvm_install_symlink(${link_name} ${target})
++      GNUInstallDirs_get_absolute_install_dir(output_dir LLVM_TOOLS_INSTALL_DIR)
++      llvm_install_symlink(${link_name} ${target} ${output_dir})
+     endif()
+   endif()
+ endfunction()
+@@ -1670,9 +1671,9 @@ function(llvm_setup_rpath name)
+ 
+   if (APPLE)
+     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
+-    set(_install_rpath "@loader_path/../lib" ${extra_libdir})
++    set(_install_rpath "@loader_path/../${CMAKE_INSTALL_LIBDIR}" ${extra_libdir})
+   elseif(UNIX)
+-    set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
+       set_property(TARGET ${name} APPEND_STRING PROPERTY
+                    LINK_FLAGS " -Wl,-z,origin ")
+diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
+index 02bab6846376..eff26adb2efc 100644
+--- a/cmake/modules/AddOCaml.cmake
++++ b/cmake/modules/AddOCaml.cmake
+@@ -140,9 +140,9 @@ function(add_ocaml_library name)
+   endforeach()
+ 
+   if( APPLE )
+-    set(ocaml_rpath "@executable_path/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "@executable_path/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   elseif( UNIX )
+-    set(ocaml_rpath "\\$ORIGIN/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "\\$ORIGIN/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   endif()
+   list(APPEND ocaml_flags "-ldopt" "-Wl,-rpath,${ocaml_rpath}")
+ 
+diff --git a/cmake/modules/AddSphinxTarget.cmake b/cmake/modules/AddSphinxTarget.cmake
+index 22e3dcb776aa..ba77b9c195e2 100644
+--- a/cmake/modules/AddSphinxTarget.cmake
++++ b/cmake/modules/AddSphinxTarget.cmake
+@@ -73,7 +73,7 @@ function (add_sphinx_target builder project)
+ 
+       elseif (builder STREQUAL html)
+         string(TOUPPER "${project}" project_upper)
+-        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
++        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/html"
+             CACHE STRING "HTML documentation install directory for ${project}")
+ 
+         # '/.' indicates: copy the contents of the directory directly into
+diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
+index f5cc0006fa06..77698aeaf000 100644
+--- a/cmake/modules/CMakeLists.txt
++++ b/cmake/modules/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
++set(LLVM_INSTALL_PACKAGE_DIR ${LLVM_INSTALL_CMAKE_DIR} CACHE STRING "Path for CMake subdirectory (defaults to 'cmake/llvm')")
+ set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+ 
+ # First for users who use an installed LLVM, create the LLVMExports.cmake file.
+@@ -90,11 +90,11 @@ foreach(p ${_count})
+   set(LLVM_CONFIG_CODE "${LLVM_CONFIG_CODE}
+ get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
+ endforeach(p)
+-set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
+-set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
++set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
++set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
+ set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
+ set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
+-set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/bin")
++set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}")
+ set(LLVM_CONFIG_EXPORTS_FILE "\${LLVM_CMAKE_DIR}/LLVMExports.cmake")
+ set(LLVM_CONFIG_EXPORTS "${LLVM_EXPORTS}")
+ configure_file(
+diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
+index 1a04de931ff7..1c5ea4200635 100644
+--- a/cmake/modules/LLVMInstallSymlink.cmake
++++ b/cmake/modules/LLVMInstallSymlink.cmake
+@@ -10,7 +10,7 @@ function(install_symlink name target outdir)
+     set(LINK_OR_COPY copy)
+   endif()
+ 
+-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
++  set(bindir "${DESTDIR}${outdir}/")
+ 
+   message("Creating ${name}")
+ 
+diff --git a/docs/CMake.rst b/docs/CMake.rst
+index eb219c58560b..6f32532f8ebf 100644
+--- a/docs/CMake.rst
++++ b/docs/CMake.rst
+@@ -196,7 +196,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
+ **LLVM_LIBDIR_SUFFIX**:STRING
+   Extra suffix to append to the directory where libraries are to be
+   installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
+-  to install libraries to ``/usr/lib64``.
++  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
+ 
+ **CMAKE_C_FLAGS**:STRING
+   Extra flags to use when compiling C source files.
+@@ -479,8 +479,8 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
+   The path to install Doxygen-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/doxygen-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
+ 
+ **LLVM_ENABLE_SPHINX**:BOOL
+   If specified, CMake will search for the ``sphinx-build`` executable and will make
+@@ -511,13 +511,33 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_SPHINX_HTML_DIR**:STRING
+   The path to install Sphinx-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/html`.
+ 
+ **LLVM_INSTALL_OCAMLDOC_HTML_DIR**:STRING
+   The path to install OCamldoc-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/ocaml-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html`.
++
++**CMAKE_INSTALL_BINDIR**:STRING
++  The path to install binary tools, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `bin`.
++
++**CMAKE_INSTALL_LIBDIR**:STRING
++  The path to install libraries, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `lib`.
++
++**CMAKE_INSTALL_INCLUDEDIR**:STRING
++  The path to install header files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `include`.
++
++**CMAKE_INSTALL_DOCDIR**:STRING
++  The path to install documentation, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/doc`.
++
++**CMAKE_INSTALL_MANDIR**:STRING
++  The path to install manpage files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/man`.
+ 
+ **LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
+   OS X Only: If enabled CMake will generate a target named
+@@ -691,9 +711,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
+ 
+ This file is available in two different locations.
+ 
+-* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
+-  ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
+-  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
++* ``<LLVM_INSTALL_PACKAGE_DIR>LLVMConfig.cmake`` where
++  ``<LLVM_INSTALL_PACKAGE_DIR>`` is the location where LLVM CMake modules are
++  installed as part of an installed version of LLVM. This is typically
++  ``cmake/llvm/`` within the lib directory. On Linux, this is typically
++  ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
+ 
+ * ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
+   ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
+diff --git a/include/llvm/CMakeLists.txt b/include/llvm/CMakeLists.txt
+index 1d5ca3ba92b0..026f5453c1da 100644
+--- a/include/llvm/CMakeLists.txt
++++ b/include/llvm/CMakeLists.txt
+@@ -4,5 +4,5 @@ add_subdirectory(Support)
+ # If we're doing an out-of-tree build, copy a module map for generated
+ # header files into the build area.
+ if (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+-  configure_file(module.modulemap.build module.modulemap COPYONLY)
++  configure_file(module.modulemap.build ${LLVM_INCLUDE_DIR}/module.modulemap COPYONLY)
+ endif (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
+index f201e1f7bff0..4582ed556a02 100644
+--- a/tools/llvm-config/BuildVariables.inc.in
++++ b/tools/llvm-config/BuildVariables.inc.in
+@@ -24,6 +24,10 @@
+ #define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
+ #define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
+ #define LLVM_LIBDIR_SUFFIX "@LLVM_LIBDIR_SUFFIX@"
++#define LLVM_INSTALL_BINDIR "@CMAKE_INSTALL_BINDIR@"
++#define LLVM_INSTALL_LIBDIR "@CMAKE_INSTALL_LIBDIR@"
++#define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
++#define LLVM_INSTALL_CMAKEDIR "@LLVM_INSTALL_CMAKE_DIR@"
+ #define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
+ #define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
+ #define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
+diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
+index bec89fef98ca..31d78f925d45 100644
+--- a/tools/llvm-config/llvm-config.cpp
++++ b/tools/llvm-config/llvm-config.cpp
+@@ -333,12 +333,26 @@ int main(int argc, char **argv) {
+         ("-I" + ActiveIncludeDir + " " + "-I" + ActiveObjRoot + "/include");
+   } else {
+     ActivePrefix = CurrentExecPrefix;
+-    ActiveIncludeDir = ActivePrefix + "/include";
+-    SmallString<256> path(StringRef(LLVM_TOOLS_INSTALL_DIR));
+-    sys::fs::make_absolute(ActivePrefix, path);
+-    ActiveBinDir = path.str();
+-    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
+-    ActiveCMakeDir = ActiveLibDir + "/cmake/llvm";
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_INCLUDEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveIncludeDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_BINDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveBinDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveLibDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_CMAKEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveCMakeDir = std::string(path.str());
++    }
+     ActiveIncludeOption = "-I" + ActiveIncludeDir;
+   }
+ 
+diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
+index 6e913519a809..85641eef721f 100644
+--- a/tools/lto/CMakeLists.txt
++++ b/tools/lto/CMakeLists.txt
+@@ -19,7 +19,7 @@ set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/lto.exports)
+ add_llvm_library(LTO SHARED ${SOURCES} DEPENDS intrinsics_gen)
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/lto.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT LTO)
+ 
+ if (APPLE)
+diff --git a/tools/opt-remarks/CMakeLists.txt b/tools/opt-remarks/CMakeLists.txt
+index a87beae1e893..149ea3d10168 100644
+--- a/tools/opt-remarks/CMakeLists.txt
++++ b/tools/opt-remarks/CMakeLists.txt
+@@ -11,7 +11,7 @@ set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/OptRemarks.exports)
+ add_llvm_library(OptRemarks SHARED ${SOURCES})
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/OptRemarks.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT OptRemarks)
+ 
+ if (APPLE)
+diff --git a/tools/opt-viewer/CMakeLists.txt b/tools/opt-viewer/CMakeLists.txt
+index 19b606933082..27b9f71b3d79 100644
+--- a/tools/opt-viewer/CMakeLists.txt
++++ b/tools/opt-viewer/CMakeLists.txt
+@@ -8,6 +8,6 @@ set (files
+ 
+ foreach (file ${files})
+   install(PROGRAMS ${file}
+-    DESTINATION share/opt-viewer
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/opt-viewer
+     COMPONENT opt-viewer)
+ endforeach (file)
diff --git a/pkgs/development/compilers/llvm/9/clang/default.nix b/pkgs/development/compilers/llvm/9/clang/default.nix
index 87b29163f43..f1c21083bb6 100644
--- a/pkgs/development/compilers/llvm/9/clang/default.nix
+++ b/pkgs/development/compilers/llvm/9/clang/default.nix
@@ -1,4 +1,5 @@
-{ lib, stdenv, fetch, cmake, libxml2, llvm, version, clang-tools-extra_src, python3, lld
+{ lib, stdenv, fetch, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
+, buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
 , enablePolly ? false # TODO: get this info from llvm (passthru?)
@@ -23,18 +24,22 @@ let
       ++ lib.optional enableManpages python3.pkgs.sphinx
       ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-    buildInputs = [ libxml2 llvm lld ];
+    buildInputs = [ libxml2 libllvm ];
 
     cmakeFlags = [
       "-DCMAKE_CXX_FLAGS=-std=c++11"
       "-DCLANGD_BUILD_XPC=OFF"
       "-DLLVM_ENABLE_RTTI=ON"
+      "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
     ] ++ lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"
       "-DSPHINX_OUTPUT_MAN=ON"
       "-DSPHINX_OUTPUT_HTML=OFF"
       "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
+    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
     ] ++ lib.optionals enablePolly [
       "-DWITH_POLLY=ON"
       "-DLINK_POLLY_INTO_TOOLS=ON"
@@ -46,6 +51,7 @@ let
       ./compiler-rt-baremetal.patch
       # make clang -xhip use $PATH to find executables
       ./HIP-use-PATH-9.patch
+      ./gnu-install-dirs.patch
     ];
 
     postPatch = ''
@@ -62,12 +68,12 @@ let
         --replace "NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB" FALSE
     '';
 
-    outputs = [ "out" "lib" "python" ];
+    outputs = [ "out" "lib" "dev" "python" ];
 
     # Clang expects to find LLVMgold in its own prefix
     postInstall = ''
-      if [ -e ${llvm}/lib/LLVMgold.so ]; then
-        ln -sv ${llvm}/lib/LLVMgold.so $out/lib
+      if [ -e ${libllvm.lib}/lib/LLVMgold.so ]; then
+        ln -sv ${libllvm.lib}/lib/LLVMgold.so $lib/lib
       fi
 
       ln -sv $out/bin/clang $out/bin/cpp
@@ -86,11 +92,14 @@ let
       fi
       mv $out/share/clang/*.py $python/share/clang
       rm $out/bin/c-index-test
+
+      mkdir -p $dev/bin
+      cp bin/clang-tblgen $dev/bin
     '';
 
     passthru = {
       isClang = true;
-      inherit llvm;
+      inherit libllvm;
     };
 
     meta = {
diff --git a/pkgs/development/compilers/llvm/9/clang/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/9/clang/gnu-install-dirs.patch
new file mode 100644
index 00000000000..625cbcc7236
--- /dev/null
+++ b/pkgs/development/compilers/llvm/9/clang/gnu-install-dirs.patch
@@ -0,0 +1,278 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 60937aa9db38..45522ff32998 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -9,6 +9,8 @@ endif()
+ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
+   project(Clang)
+ 
++  include(GNUInstallDirs)
++
+   # Rely on llvm-config.
+   set(CONFIG_OUTPUT)
+   if(LLVM_CONFIG)
+@@ -413,7 +415,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/clang include/clang-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -423,7 +425,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/clang
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT clang-headers
+     FILES_MATCHING
+     PATTERN "CMakeFiles" EXCLUDE
+@@ -442,7 +444,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   endif()
+ 
+   install(PROGRAMS utils/bash-autocomplete.sh
+-    DESTINATION share/clang
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+     )
+ endif()
+ 
+diff --git a/cmake/modules/AddClang.cmake b/cmake/modules/AddClang.cmake
+index cbd618e18afb..63ba43f18e64 100644
+--- a/cmake/modules/AddClang.cmake
++++ b/cmake/modules/AddClang.cmake
+@@ -109,9 +109,9 @@ macro(add_clang_library name)
+       install(TARGETS ${name}
+         COMPONENT ${name}
+         ${export_to_clangtargets}
+-        LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-        RUNTIME DESTINATION bin)
++        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+       if (NOT LLVM_ENABLE_IDE)
+         add_llvm_install_targets(install-${name}
+@@ -155,7 +155,7 @@ macro(add_clang_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_clangtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT LLVM_ENABLE_IDE)
+@@ -170,7 +170,7 @@ endmacro()
+ macro(add_clang_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+ 
+ function(clang_target_link_libraries target type)
+diff --git a/lib/Headers/CMakeLists.txt b/lib/Headers/CMakeLists.txt
+index a3c0b08fa364..aa4215c0999c 100644
+--- a/lib/Headers/CMakeLists.txt
++++ b/lib/Headers/CMakeLists.txt
+@@ -185,7 +185,7 @@ set_target_properties(clang-resource-headers PROPERTIES
+   FOLDER "Misc"
+   RUNTIME_OUTPUT_DIRECTORY "${output_dir}")
+ 
+-set(header_install_dir lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
++set(header_install_dir ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION}/include)
+ 
+ install(
+   FILES ${files} ${generated_files}
+diff --git a/tools/c-index-test/CMakeLists.txt b/tools/c-index-test/CMakeLists.txt
+index ceef4b08637c..8efad5520ca4 100644
+--- a/tools/c-index-test/CMakeLists.txt
++++ b/tools/c-index-test/CMakeLists.txt
+@@ -54,7 +54,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     set_property(TARGET c-index-test APPEND PROPERTY INSTALL_RPATH
+        "@executable_path/../../lib")
+   else()
+-    set(INSTALL_DESTINATION bin)
++    set(INSTALL_DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endif()
+ 
+   install(TARGETS c-index-test
+diff --git a/tools/clang-check/CMakeLists.txt b/tools/clang-check/CMakeLists.txt
+index 4576d78bcfb4..7c3b302d8d59 100644
+--- a/tools/clang-check/CMakeLists.txt
++++ b/tools/clang-check/CMakeLists.txt
+@@ -21,4 +21,4 @@ clang_target_link_libraries(clang-check
+   )
+ 
+ install(TARGETS clang-check
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-extdef-mapping/CMakeLists.txt b/tools/clang-extdef-mapping/CMakeLists.txt
+index 4798bdb71ad0..02d07b9982ac 100644
+--- a/tools/clang-extdef-mapping/CMakeLists.txt
++++ b/tools/clang-extdef-mapping/CMakeLists.txt
+@@ -18,4 +18,4 @@ clang_target_link_libraries(clang-extdef-mapping
+   )
+ 
+ install(TARGETS clang-extdef-mapping
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-format/CMakeLists.txt b/tools/clang-format/CMakeLists.txt
+index 35ecdb11253c..d77d75de0094 100644
+--- a/tools/clang-format/CMakeLists.txt
++++ b/tools/clang-format/CMakeLists.txt
+@@ -21,20 +21,20 @@ if( LLVM_LIB_FUZZING_ENGINE OR LLVM_USE_SANITIZE_COVERAGE )
+ endif()
+ 
+ install(PROGRAMS clang-format-bbedit.applescript
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-diff.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format-sublime.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS clang-format.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-format)
+ install(PROGRAMS git-clang-format
+-  DESTINATION bin
++  DESTINATION ${CMAKE_INSTALL_BINDIR}
+   COMPONENT clang-format)
+diff --git a/tools/clang-offload-bundler/CMakeLists.txt b/tools/clang-offload-bundler/CMakeLists.txt
+index 465bef040a6c..729369ed9429 100644
+--- a/tools/clang-offload-bundler/CMakeLists.txt
++++ b/tools/clang-offload-bundler/CMakeLists.txt
+@@ -22,4 +22,4 @@ clang_target_link_libraries(clang-offload-bundler
+   ${CLANG_OFFLOAD_BUNDLER_LIB_DEPS}
+   )
+ 
+-install(TARGETS clang-offload-bundler RUNTIME DESTINATION bin)
++install(TARGETS clang-offload-bundler RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+diff --git a/tools/clang-rename/CMakeLists.txt b/tools/clang-rename/CMakeLists.txt
+index cda8e29ec5b1..0134d8ccd70b 100644
+--- a/tools/clang-rename/CMakeLists.txt
++++ b/tools/clang-rename/CMakeLists.txt
+@@ -19,8 +19,8 @@ clang_target_link_libraries(clang-rename
+   )
+ 
+ install(PROGRAMS clang-rename.py
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+ install(PROGRAMS clang-rename.el
+-  DESTINATION share/clang
++  DESTINATION ${CMAKE_INSTALL_DATADIR}/clang
+   COMPONENT clang-rename)
+diff --git a/tools/diagtool/CMakeLists.txt b/tools/diagtool/CMakeLists.txt
+index a95444be40ee..136d96d9bf5b 100644
+--- a/tools/diagtool/CMakeLists.txt
++++ b/tools/diagtool/CMakeLists.txt
+@@ -21,7 +21,7 @@ clang_target_link_libraries(diagtool
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(TARGETS diagtool
+     COMPONENT diagtool
+-    RUNTIME DESTINATION bin)
++    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+   if (NOT LLVM_ENABLE_IDE)
+     add_llvm_install_targets(install-diagtool
+diff --git a/tools/libclang/CMakeLists.txt b/tools/libclang/CMakeLists.txt
+index 613ead1a36b6..e5c7bf27f739 100644
+--- a/tools/libclang/CMakeLists.txt
++++ b/tools/libclang/CMakeLists.txt
+@@ -137,7 +137,7 @@ endif()
+ if(INTERNAL_INSTALL_PREFIX)
+   set(LIBCLANG_HEADERS_INSTALL_DESTINATION "${INTERNAL_INSTALL_PREFIX}/include")
+ else()
+-  set(LIBCLANG_HEADERS_INSTALL_DESTINATION include)
++  set(LIBCLANG_HEADERS_INSTALL_DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+ endif()
+ 
+ install(DIRECTORY ../../include/clang-c
+@@ -168,7 +168,7 @@ foreach(PythonVersion ${CLANG_PYTHON_BINDINGS_VERSIONS})
+           COMPONENT
+             libclang-python-bindings
+           DESTINATION
+-            "lib${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
++            "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/python${PythonVersion}/site-packages")
+ endforeach()
+ if(NOT LLVM_ENABLE_IDE)
+   add_custom_target(libclang-python-bindings)
+diff --git a/tools/scan-build/CMakeLists.txt b/tools/scan-build/CMakeLists.txt
+index 380379300b09..adfd58ed5f7d 100644
+--- a/tools/scan-build/CMakeLists.txt
++++ b/tools/scan-build/CMakeLists.txt
+@@ -41,7 +41,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/bin/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
++    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endforeach()
+ 
+   foreach(LibexecFile ${LibexecFiles})
+@@ -53,7 +53,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/libexec/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/libexec/${LibexecFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/libexec/${LibexecFile})
+-    install(PROGRAMS libexec/${LibexecFile} DESTINATION libexec)
++    install(PROGRAMS libexec/${LibexecFile} DESTINATION ${CMAKE_INSTALL_LIBEXECDIR})
+   endforeach()
+ 
+   foreach(ManPage ${ManPages})
+@@ -77,7 +77,7 @@ if(CLANG_INSTALL_SCANBUILD)
+                          ${CMAKE_BINARY_DIR}/share/scan-build/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/scan-build/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-build/${ShareFile})
+-    install(FILES share/scan-build/${ShareFile} DESTINATION share/scan-build)
++    install(FILES share/scan-build/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-build)
+   endforeach()
+ 
+   add_custom_target(scan-build ALL DEPENDS ${Depends})
+diff --git a/tools/scan-view/CMakeLists.txt b/tools/scan-view/CMakeLists.txt
+index b305ca562a72..554bcb379061 100644
+--- a/tools/scan-view/CMakeLists.txt
++++ b/tools/scan-view/CMakeLists.txt
+@@ -21,7 +21,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                          ${CMAKE_BINARY_DIR}/bin/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/bin/${BinFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/bin/${BinFile})
+-    install(PROGRAMS bin/${BinFile} DESTINATION bin)
++    install(PROGRAMS bin/${BinFile} DESTINATION ${CMAKE_INSTALL_BINDIR})
+   endforeach()
+ 
+   foreach(ShareFile ${ShareFiles})
+@@ -33,7 +33,7 @@ if(CLANG_INSTALL_SCANVIEW)
+                          ${CMAKE_BINARY_DIR}/share/scan-view/
+                        DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/share/${ShareFile})
+     list(APPEND Depends ${CMAKE_BINARY_DIR}/share/scan-view/${ShareFile})
+-    install(FILES share/${ShareFile} DESTINATION share/scan-view)
++    install(FILES share/${ShareFile} DESTINATION ${CMAKE_INSTALL_DATADIR}/scan-view)
+   endforeach()
+ 
+   add_custom_target(scan-view ALL DEPENDS ${Depends})
+diff --git a/utils/hmaptool/CMakeLists.txt b/utils/hmaptool/CMakeLists.txt
+index 5573009d343a..24b3a90f233f 100644
+--- a/utils/hmaptool/CMakeLists.txt
++++ b/utils/hmaptool/CMakeLists.txt
+@@ -9,7 +9,7 @@ add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HM
+                    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${CLANG_HMAPTOOL})
+ 
+ list(APPEND Depends ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin/${CLANG_HMAPTOOL})
+-install(PROGRAMS ${CLANG_HMAPTOOL} DESTINATION bin)
++install(PROGRAMS ${CLANG_HMAPTOOL} DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ add_custom_target(hmaptool ALL DEPENDS ${Depends})
+ set_target_properties(hmaptool PROPERTIES FOLDER "Utils")
diff --git a/pkgs/development/compilers/llvm/9/compiler-rt/default.nix b/pkgs/development/compilers/llvm/9/compiler-rt/default.nix
index cfc8e0ea74a..285fe811514 100644
--- a/pkgs/development/compilers/llvm/9/compiler-rt/default.nix
+++ b/pkgs/development/compilers/llvm/9/compiler-rt/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   inherit version;
   src = fetch pname "0xwh79g3zggdabxgnd0bphry75asm1qz7mv3hcqihqwqr6aspgy2";
 
-  nativeBuildInputs = [ cmake python3 llvm ];
+  nativeBuildInputs = [ cmake python3 llvm.dev ];
   buildInputs = lib.optional stdenv.hostPlatform.isDarwin libcxxabi;
 
   NIX_CFLAGS_COMPILE = [
@@ -54,6 +54,7 @@ stdenv.mkDerivation rec {
     # https://github.com/llvm/llvm-project/commit/947f9692440836dcb8d88b74b69dd379d85974ce
     ../../common/compiler-rt/glibc.patch
     ./codesign.patch # Revert compiler-rt commit that makes codesign mandatory
+    ./gnu-install-dirs.patch
   ]# ++ lib.optional stdenv.hostPlatform.isMusl ./sanitizers-nongnu.patch
     ++ lib.optional stdenv.hostPlatform.isAarch32 ./armv7l.patch;
 
diff --git a/pkgs/development/compilers/llvm/9/compiler-rt/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/9/compiler-rt/gnu-install-dirs.patch
new file mode 100644
index 00000000000..7967bbc4855
--- /dev/null
+++ b/pkgs/development/compilers/llvm/9/compiler-rt/gnu-install-dirs.patch
@@ -0,0 +1,117 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index f26ae25ada30..8ba536afdccc 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -12,6 +12,7 @@ endif()
+ # Check if compiler-rt is built as a standalone project.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR COMPILER_RT_STANDALONE_BUILD)
+   project(CompilerRT C CXX ASM)
++  include(GNUInstallDirs)
+   set(COMPILER_RT_STANDALONE_BUILD TRUE)
+   set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+ endif()
+diff --git a/cmake/Modules/AddCompilerRT.cmake b/cmake/Modules/AddCompilerRT.cmake
+index f7ee932f214f..ef94a97c4be9 100644
+--- a/cmake/Modules/AddCompilerRT.cmake
++++ b/cmake/Modules/AddCompilerRT.cmake
+@@ -488,7 +488,7 @@ macro(add_compiler_rt_resource_file target_name file_name component)
+   add_custom_target(${target_name} DEPENDS ${dst_file})
+   # Install in Clang resource directory.
+   install(FILES ${file_name}
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/share
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}
+     COMPONENT ${component})
+   add_dependencies(${component} ${target_name})
+ 
+@@ -505,7 +505,7 @@ macro(add_compiler_rt_script name)
+   add_custom_target(${name} DEPENDS ${dst})
+   install(FILES ${dst}
+     PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
+-    DESTINATION ${COMPILER_RT_INSTALL_PATH}/bin)
++    DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_BINDIR})
+ endmacro(add_compiler_rt_script src name)
+ 
+ # Builds custom version of libc++ and installs it in <prefix>.
+diff --git a/cmake/Modules/CompilerRTDarwinUtils.cmake b/cmake/Modules/CompilerRTDarwinUtils.cmake
+index b50d55b56940..7e5729ad9c8e 100644
+--- a/cmake/Modules/CompilerRTDarwinUtils.cmake
++++ b/cmake/Modules/CompilerRTDarwinUtils.cmake
+@@ -386,7 +386,7 @@ macro(darwin_add_embedded_builtin_libraries)
+     set(DARWIN_macho_embedded_LIBRARY_OUTPUT_DIR
+       ${COMPILER_RT_OUTPUT_DIR}/lib/macho_embedded)
+     set(DARWIN_macho_embedded_LIBRARY_INSTALL_DIR
+-      ${COMPILER_RT_INSTALL_PATH}/lib/macho_embedded)
++      ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/macho_embedded)
+       
+     set(CFLAGS_armv7 "-target thumbv7-apple-darwin-eabi")
+     set(CFLAGS_i386 "-march=pentium")
+diff --git a/cmake/Modules/CompilerRTUtils.cmake b/cmake/Modules/CompilerRTUtils.cmake
+index 6e672b1e1818..64999709958e 100644
+--- a/cmake/Modules/CompilerRTUtils.cmake
++++ b/cmake/Modules/CompilerRTUtils.cmake
+@@ -371,7 +371,7 @@ endfunction()
+ function(get_compiler_rt_install_dir arch install_dir)
+   if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+     get_compiler_rt_target(${arch} target)
+-    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/lib/${target} PARENT_SCOPE)
++    set(${install_dir} ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${target} PARENT_SCOPE)
+   else()
+     set(${install_dir} ${COMPILER_RT_LIBRARY_INSTALL_DIR} PARENT_SCOPE)
+   endif()
+diff --git a/cmake/base-config-ix.cmake b/cmake/base-config-ix.cmake
+index cef0e0d73d87..db33fb028287 100644
+--- a/cmake/base-config-ix.cmake
++++ b/cmake/base-config-ix.cmake
+@@ -55,11 +55,11 @@ if (LLVM_TREE_AVAILABLE)
+ else()
+     # Take output dir and install path from the user.
+   set(COMPILER_RT_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR} CACHE PATH
+-    "Path where built compiler-rt libraries should be stored.")
++    "Path where built compiler-rt build artifacts should be stored.")
+   set(COMPILER_RT_EXEC_OUTPUT_DIR ${CMAKE_CURRENT_BINARY_DIR}/bin CACHE PATH
+     "Path where built compiler-rt executables should be stored.")
+-  set(COMPILER_RT_INSTALL_PATH ${CMAKE_INSTALL_PREFIX} CACHE PATH
+-    "Path where built compiler-rt libraries should be installed.")
++  set(COMPILER_RT_INSTALL_PATH "" CACHE PATH
++    "Prefix where built compiler-rt artifacts should be installed, comes before CMAKE_INSTALL_PREFIX.")
+   option(COMPILER_RT_INCLUDE_TESTS "Generate and build compiler-rt unit tests." OFF)
+   option(COMPILER_RT_ENABLE_WERROR "Fail and stop if warning is triggered" OFF)
+   # Use a host compiler to compile/link tests.
+@@ -87,7 +87,7 @@ else(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR)
+   set(COMPILER_RT_LIBRARY_OUTPUT_DIR
+     ${COMPILER_RT_OUTPUT_DIR}/lib/${COMPILER_RT_OS_DIR})
+   set(COMPILER_RT_LIBRARY_INSTALL_DIR
+-    ${COMPILER_RT_INSTALL_PATH}/lib/${COMPILER_RT_OS_DIR})
++    ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_LIBDIR}/${COMPILER_RT_OS_DIR})
+ endif()
+ 
+ if(APPLE)
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index 38bd6e41a912..2092d0d08247 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -50,12 +50,12 @@ set_target_properties(compiler-rt-headers PROPERTIES FOLDER "Compiler-RT Misc")
+ install(FILES ${SANITIZER_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/sanitizer)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/sanitizer)
+ # Install xray headers.
+ install(FILES ${XRAY_HEADERS}
+   COMPONENT compiler-rt-headers
+   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+-  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include/xray)
++  DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_INCLUDEDIR}/xray)
+ 
+ if (NOT CMAKE_CONFIGURATION_TYPES) # don't add this for IDEs.
+   add_custom_target(install-compiler-rt-headers
+diff --git a/lib/dfsan/CMakeLists.txt b/lib/dfsan/CMakeLists.txt
+index b3ae713cf02c..52b364b900f5 100644
+--- a/lib/dfsan/CMakeLists.txt
++++ b/lib/dfsan/CMakeLists.txt
+@@ -54,4 +54,4 @@ add_custom_command(OUTPUT ${dfsan_abilist_filename}
+                    DEPENDS done_abilist.txt libc_ubuntu1404_abilist.txt)
+ add_dependencies(dfsan dfsan_abilist)
+ install(FILES ${dfsan_abilist_filename}
+-        DESTINATION ${COMPILER_RT_INSTALL_PATH}/share)
++        DESTINATION ${COMPILER_RT_INSTALL_PATH}/${CMAKE_INSTALL_FULL_DATADIR})
diff --git a/pkgs/development/compilers/llvm/9/default.nix b/pkgs/development/compilers/llvm/9/default.nix
index 1b8bdad07bb..0660bac137f 100644
--- a/pkgs/development/compilers/llvm/9/default.nix
+++ b/pkgs/development/compilers/llvm/9/default.nix
@@ -1,6 +1,5 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, gccForLibs
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
-, buildPackages
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 }:
@@ -18,43 +17,52 @@ let
   clang-tools-extra_src = fetch "clang-tools-extra" "01vgzd4k1q93nfs8gyl83mjlc4x0qsgfqw32lacbjzdxg0mdfvxj";
 
   tools = lib.makeExtensible (tools: let
-    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch; });
-    mkExtraBuildCommands = cc: ''
+    callPackage = newScope (tools // { inherit stdenv cmake libxml2 python3 isl release_version version fetch buildLlvmTools; });
+    mkExtraBuildCommands0 = cc: ''
       rsrc="$out/resource-root"
       mkdir "$rsrc"
-      ln -s "${cc}/lib/clang/${release_version}/include" "$rsrc"
-      ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
+      ln -s "${cc.lib}/lib/clang/${release_version}/include" "$rsrc"
       echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
     '';
+    mkExtraBuildCommands = cc: mkExtraBuildCommands0 cc + ''
+      ln -s "${targetLlvmLibraries.compiler-rt.out}/lib" "$rsrc/lib"
+    '';
+
   in {
 
-    llvm = callPackage ./llvm { };
+    libllvm = callPackage ./llvm { };
+
+    # `llvm` historically had the binaries.  When choosing an output explicitly,
+    # we need to reintroduce `outputUnspecified` to get the expected behavior e.g. of lib.get*
+    llvm = tools.libllvm.out // { outputUnspecified = true; };
 
-    llvm-polly = callPackage ./llvm { enablePolly = true; };
+    libllvm-polly = callPackage ./llvm { enablePolly = true; };
 
-    clang-unwrapped = callPackage ./clang {
-      inherit (tools) lld;
+    llvm-polly = tools.libllvm-polly.lib // { outputUnspecified = true; };
+
+    libclang = callPackage ./clang {
       inherit clang-tools-extra_src;
     };
+
+    clang-unwrapped = tools.libclang.out // { outputUnspecified = true; };
+
     clang-polly-unwrapped = callPackage ./clang {
       inherit clang-tools-extra_src;
-      llvm = tools.llvm-polly;
+      libllvm = tools.libllvm-polly;
       enablePolly = true;
     };
 
     # disabled until recommonmark supports sphinx 3
-    #llvm-manpages = lowPrio (tools.llvm.override {
+    #llvm-manpages = lowPrio (tools.libllvm.override {
     #  enableManpages = true;
     #  python3 = pkgs.python3;  # don't use python-boot
     #});
 
-    clang-manpages = lowPrio (tools.clang-unwrapped.override {
+    clang-manpages = lowPrio (tools.libclang.override {
       enableManpages = true;
       python3 = pkgs.python3;  # don't use python-boot
     });
 
-    libclang = tools.clang-unwrapped.lib;
-
     clang = if stdenv.cc.isGNU then tools.libstdcxxClang else tools.libcxxClang;
 
     libstdcxxClang = wrapCCWith rec {
@@ -144,7 +152,7 @@ let
       '' + mkExtraBuildCommands cc;
     };
 
-    lldClangNoCompilerRt = wrapCCWith {
+    lldClangNoCompilerRt = wrapCCWith rec {
       cc = tools.clang-unwrapped;
       libcxx = null;
       bintools = wrapBintoolsWith {
@@ -154,7 +162,7 @@ let
       extraPackages = [ ];
       extraBuildCommands = ''
         echo "-nostartfiles" >> $out/nix-support/cc-cflags
-      '';
+      '' + mkExtraBuildCommands0 cc;
     };
 
   });
diff --git a/pkgs/development/compilers/llvm/9/libc++/default.nix b/pkgs/development/compilers/llvm/9/libc++/default.nix
index 6ea1e28e7b4..3cdb4f32a05 100644
--- a/pkgs/development/compilers/llvm/9/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/9/libc++/default.nix
@@ -13,7 +13,11 @@ stdenv.mkDerivation {
     export LIBCXXABI_INCLUDE_DIR="$PWD/$(ls -d libcxxabi-${version}*)/include"
   '';
 
-  patches = lib.optional stdenv.hostPlatform.isMusl ../../libcxx-0001-musl-hacks.patch;
+  outputs = [ "out" "dev" ];
+
+  patches = [
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional stdenv.hostPlatform.isMusl ../../libcxx-0001-musl-hacks.patch;
 
   preConfigure = ''
     # Get headers from the cxxabi source so we can see private headers not installed by the cxxabi package
diff --git a/pkgs/development/compilers/llvm/9/libc++/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/9/libc++/gnu-install-dirs.patch
new file mode 100644
index 00000000000..424488bd2e5
--- /dev/null
+++ b/pkgs/development/compilers/llvm/9/libc++/gnu-install-dirs.patch
@@ -0,0 +1,99 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index ec1869ddc7ae..a1c040235c8d 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -26,6 +26,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXX_STANDALONE_BUILD)
+   project(libcxx CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxx)
+   set(PACKAGE_VERSION 9.0.1)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+@@ -416,7 +418,7 @@ string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
+ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   set(LIBCXX_HEADER_DIR ${LLVM_BINARY_DIR})
+-  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
++  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBCXX_LIBRARY_DIR /${LIBCXX_LIBDIR_SUBDIR})
+     string(APPEND LIBCXX_INSTALL_LIBRARY_DIR /${LIBCXX_LIBDIR_SUBDIR})
+@@ -424,10 +426,10 @@ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+   set(LIBCXX_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+   set(LIBCXX_HEADER_DIR  ${LLVM_BINARY_DIR})
+-  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX})
++  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX})
+ else()
+   set(LIBCXX_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXX_LIBDIR_SUFFIX})
+-  set(LIBCXX_INSTALL_LIBRARY_DIR lib${LIBCXX_LIBDIR_SUFFIX})
++  set(LIBCXX_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXX_LIBDIR_SUFFIX})
+ endif()
+ 
+ file(MAKE_DIRECTORY "${LIBCXX_BINARY_INCLUDE_DIR}")
+diff --git a/cmake/Modules/HandleLibCXXABI.cmake b/cmake/Modules/HandleLibCXXABI.cmake
+index 10f100f7f0fb..95ed3978ab73 100644
+--- a/cmake/Modules/HandleLibCXXABI.cmake
++++ b/cmake/Modules/HandleLibCXXABI.cmake
+@@ -61,7 +61,7 @@ macro(setup_abi_lib abidefines abishared abistatic abifiles abidirs)
+ 
+         if (LIBCXX_INSTALL_HEADERS)
+           install(FILES "${LIBCXX_BINARY_INCLUDE_DIR}/${fpath}"
+-            DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1/${dstdir}
++            DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dstdir}
+             COMPONENT cxx-headers
+             PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+             )
+diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
+index 7cbf82caa81f..7cbde7accd78 100644
+--- a/include/CMakeLists.txt
++++ b/include/CMakeLists.txt
+@@ -243,7 +243,7 @@ if (LIBCXX_INSTALL_HEADERS)
+   foreach(file ${files})
+     get_filename_component(dir ${file} DIRECTORY)
+     install(FILES ${file}
+-      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1/${dir}
++      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1/${dir}
+       COMPONENT ${CXX_HEADER_TARGET}
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+     )
+@@ -252,7 +252,7 @@ if (LIBCXX_INSTALL_HEADERS)
+   if (LIBCXX_NEEDS_SITE_CONFIG)
+     # Install the generated header as __config.
+     install(FILES ${LIBCXX_BINARY_DIR}/__generated_config
+-      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}include/c++/v1
++      DESTINATION ${LIBCXX_INSTALL_HEADER_PREFIX}${CMAKE_INSTALL_INCLUDEDIR}/c++/v1
+       PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+       RENAME __config
+       COMPONENT ${CXX_HEADER_TARGET})
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index 31cd24333a5e..a419cef662b0 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -437,21 +437,21 @@ if (LIBCXX_INSTALL_LIBRARY)
+     install(TARGETS cxx_shared
+       ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+       LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+-      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}bin COMPONENT cxx)
++      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
+   endif()
+ 
+   if (LIBCXX_INSTALL_STATIC_LIBRARY)
+     install(TARGETS cxx_static
+       ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+       LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+-      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}bin COMPONENT cxx)
++      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
+   endif()
+ 
+   if(LIBCXX_INSTALL_EXPERIMENTAL_LIBRARY)
+     install(TARGETS ${LIBCXX_INSTALL_TARGETS} ${experimental_lib}
+       LIBRARY DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+       ARCHIVE DESTINATION ${LIBCXX_INSTALL_PREFIX}${LIBCXX_INSTALL_LIBRARY_DIR} COMPONENT cxx
+-      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}bin COMPONENT cxx)
++      RUNTIME DESTINATION ${LIBCXX_INSTALL_PREFIX}${CMAKE_INSTALL_BINDIR} COMPONENT cxx)
+   endif()
+ 
+   # NOTE: This install command must go after the cxx install command otherwise
diff --git a/pkgs/development/compilers/llvm/9/libc++abi/default.nix b/pkgs/development/compilers/llvm/9/libc++abi/default.nix
index 99d3918b89d..5358985f448 100644
--- a/pkgs/development/compilers/llvm/9/libc++abi/default.nix
+++ b/pkgs/development/compilers/llvm/9/libc++abi/default.nix
@@ -8,20 +8,7 @@ stdenv.mkDerivation {
 
   src = fetch "libcxxabi" "1b4aiaa8cirx52vk2p5kfk57qmbqf1ipb4nqnjhdgqps9jm7iyg8";
 
-  nativeBuildInputs = [ cmake ];
-  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD && !stdenv.hostPlatform.isWasm) libunwind;
-
-  cmakeFlags = lib.optionals (stdenv.hostPlatform.useLLVM or false) [
-    "-DLLVM_ENABLE_LIBCXX=ON"
-    "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
-  ] ++ lib.optionals stdenv.hostPlatform.isWasm [
-    "-DLIBCXXABI_ENABLE_THREADS=OFF"
-    "-DLIBCXXABI_ENABLE_EXCEPTIONS=OFF"
-  ] ++ lib.optionals (!enableShared) [
-    "-DLIBCXXABI_ENABLE_SHARED=OFF"
-  ];
-
-  patches = [ ./no-threads.patch ];
+  outputs = [ "out" "dev" ];
 
   postUnpack = ''
     unpackFile ${libcxx.src}
@@ -35,6 +22,24 @@ stdenv.mkDerivation {
     patch -p1 -d $(ls -d llvm-*) -i ${./wasm.patch}
   '';
 
+  patches = [
+    ./no-threads.patch
+    ./gnu-install-dirs.patch
+  ];
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD && !stdenv.hostPlatform.isWasm) libunwind;
+
+  cmakeFlags = lib.optionals (stdenv.hostPlatform.useLLVM or false) [
+    "-DLLVM_ENABLE_LIBCXX=ON"
+    "-DLIBCXXABI_USE_LLVM_UNWINDER=ON"
+  ] ++ lib.optionals stdenv.hostPlatform.isWasm [
+    "-DLIBCXXABI_ENABLE_THREADS=OFF"
+    "-DLIBCXXABI_ENABLE_EXCEPTIONS=OFF"
+  ] ++ lib.optionals (!enableShared) [
+    "-DLIBCXXABI_ENABLE_SHARED=OFF"
+  ];
+
   installPhase = if stdenv.isDarwin
     then ''
       for file in lib/*.dylib; do
diff --git a/pkgs/development/compilers/llvm/9/libc++abi/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/9/libc++abi/gnu-install-dirs.patch
new file mode 100644
index 00000000000..70b41a6ff53
--- /dev/null
+++ b/pkgs/development/compilers/llvm/9/libc++abi/gnu-install-dirs.patch
@@ -0,0 +1,34 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index aa0b124fc3c4..d74373f465c5 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -20,6 +20,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBCXXABI_STANDALONE_BUILD)
+   project(libcxxabi CXX C)
+ 
++  include(GNUInstallDirs)
++
+   set(PACKAGE_NAME libcxxabi)
+   set(PACKAGE_VERSION 9.0.1)
+   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
+@@ -181,17 +183,17 @@ string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
+ 
+ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+-  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
++  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBCXXABI_LIBRARY_DIR /${LIBCXXABI_LIBDIR_SUBDIR})
+     string(APPEND LIBCXXABI_INSTALL_LIBRARY_DIR /${LIBCXXABI_LIBDIR_SUBDIR})
+   endif()
+ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+   set(LIBCXXABI_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+-  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LIBCXXABI_LIBDIR_SUFFIX})
++  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX})
+ else()
+   set(LIBCXXABI_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBCXXABI_LIBDIR_SUFFIX})
+-  set(LIBCXXABI_INSTALL_LIBRARY_DIR lib${LIBCXXABI_LIBDIR_SUFFIX})
++  set(LIBCXXABI_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBCXXABI_LIBDIR_SUFFIX})
+ endif()
+ 
+ set(LIBCXXABI_INSTALL_PREFIX "" CACHE STRING "Define libc++abi destination prefix.")
diff --git a/pkgs/development/compilers/llvm/9/libunwind/default.nix b/pkgs/development/compilers/llvm/9/libunwind/default.nix
index 4c4c85512e3..fdb362dcd2e 100644
--- a/pkgs/development/compilers/llvm/9/libunwind/default.nix
+++ b/pkgs/development/compilers/llvm/9/libunwind/default.nix
@@ -8,6 +8,12 @@ stdenv.mkDerivation rec {
 
   src = fetch pname "1wb02ha3gl6p0a321hwpll74pz5qvjr11xmjqx62g288f1m10njk";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
+  outputs = [ "out" "dev" ];
+
   nativeBuildInputs = [ cmake ];
 
   cmakeFlags = lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF";
diff --git a/pkgs/development/compilers/llvm/9/libunwind/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/9/libunwind/gnu-install-dirs.patch
new file mode 100644
index 00000000000..12171bb5155
--- /dev/null
+++ b/pkgs/development/compilers/llvm/9/libunwind/gnu-install-dirs.patch
@@ -0,0 +1,34 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index df68491d686e..3b53267ae464 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -18,6 +18,8 @@ set(CMAKE_MODULE_PATH
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBUNWIND_STANDALONE_BUILD)
+   project(libunwind)
+ 
++  include(GNUInstallDirs)
++
+   # Rely on llvm-config.
+   set(CONFIG_OUTPUT)
+   if(NOT LLVM_CONFIG_PATH)
+@@ -189,17 +191,17 @@ string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION
+ 
+ if(LLVM_ENABLE_PER_TARGET_RUNTIME_DIR AND NOT APPLE)
+   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/${LLVM_DEFAULT_TARGET_TRIPLE}/c++)
+   if(LIBCXX_LIBDIR_SUBDIR)
+     string(APPEND LIBUNWIND_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+     string(APPEND LIBUNWIND_INSTALL_LIBRARY_DIR /${LIBUNWIND_LIBDIR_SUBDIR})
+   endif()
+ elseif(LLVM_LIBRARY_OUTPUT_INTDIR)
+   set(LIBUNWIND_LIBRARY_DIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX})
+ else()
+   set(LIBUNWIND_LIBRARY_DIR ${CMAKE_BINARY_DIR}/lib${LIBUNWIND_LIBDIR_SUFFIX})
+-  set(LIBUNWIND_INSTALL_LIBRARY_DIR lib${LIBUNWIND_LIBDIR_SUFFIX})
++  set(LIBUNWIND_INSTALL_LIBRARY_DIR ${CMAKE_INSTALL_LIBDIR}${LIBUNWIND_LIBDIR_SUFFIX})
+ endif()
+ 
+ set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${LIBUNWIND_LIBRARY_DIR})
diff --git a/pkgs/development/compilers/llvm/9/lld/default.nix b/pkgs/development/compilers/llvm/9/lld/default.nix
index 8b12642d2a7..cd84afe70e4 100644
--- a/pkgs/development/compilers/llvm/9/lld/default.nix
+++ b/pkgs/development/compilers/llvm/9/lld/default.nix
@@ -1,8 +1,9 @@
 { lib, stdenv
+, buildLlvmTools
 , fetch
 , cmake
 , libxml2
-, llvm
+, libllvm
 , version
 }:
 
@@ -12,15 +13,20 @@ stdenv.mkDerivation rec {
 
   src = fetch pname "10hckfxpapfnh6y9apjiya2jpw9nmbbmh8ayijx89mrg7snjn9l6";
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
-  buildInputs = [ llvm libxml2 ];
+  buildInputs = [ libllvm libxml2 ];
 
-  outputs = [ "out" "dev" ];
+  cmakeFlags = [
+    "-DLLVM_CONFIG_PATH=${libllvm.dev}/bin/llvm-config${lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) "-native"}"
+  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+  ];
 
-  postInstall = ''
-    moveToOutput include "$dev"
-    moveToOutput lib "$dev"
-  '';
+  outputs = [ "out" "lib" "dev" ];
 
   meta = {
     description = "The LLVM Linker";
diff --git a/pkgs/development/compilers/llvm/9/lld/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/9/lld/gnu-install-dirs.patch
new file mode 100644
index 00000000000..232f5cbac9d
--- /dev/null
+++ b/pkgs/development/compilers/llvm/9/lld/gnu-install-dirs.patch
@@ -0,0 +1,68 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 641f71c114ae..9d44c1463aff 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -6,6 +6,8 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
+   set(CMAKE_INCLUDE_CURRENT_DIR ON)
+   set(LLD_BUILT_STANDALONE TRUE)
+ 
++  include(GNUInstallDirs)
++
+   find_program(LLVM_CONFIG_PATH "llvm-config" DOC "Path to llvm-config binary")
+   if(NOT LLVM_CONFIG_PATH)
+     message(FATAL_ERROR "llvm-config not found: specify LLVM_CONFIG_PATH")
+@@ -202,7 +204,7 @@ include_directories(BEFORE
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/cmake/modules/AddLLD.cmake b/cmake/modules/AddLLD.cmake
+index fa48b428d26b..e7967aad3ceb 100644
+--- a/cmake/modules/AddLLD.cmake
++++ b/cmake/modules/AddLLD.cmake
+@@ -20,9 +20,9 @@ macro(add_lld_library name)
+     install(TARGETS ${name}
+       COMPONENT ${name}
+       ${export_to_lldtargets}
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      RUNTIME DESTINATION bin)
++      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+     if (${ARG_SHARED} AND NOT CMAKE_CONFIGURATION_TYPES)
+       add_llvm_install_targets(install-${name}
+@@ -54,7 +54,7 @@ macro(add_lld_tool name)
+ 
+     install(TARGETS ${name}
+       ${export_to_lldtargets}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       COMPONENT ${name})
+ 
+     if(NOT CMAKE_CONFIGURATION_TYPES)
+@@ -69,5 +69,5 @@ endmacro()
+ macro(add_lld_symlink name dest)
+   add_llvm_tool_symlink(${name} ${dest} ALWAYS_GENERATE)
+   # Always generate install targets
+-  llvm_install_symlink(${name} ${dest} ALWAYS_GENERATE)
++  llvm_install_symlink(${name} ${dest} ${CMAKE_INSTALL_FULL_BINDIR} ALWAYS_GENERATE)
+ endmacro()
+diff --git a/tools/lld/CMakeLists.txt b/tools/lld/CMakeLists.txt
+index a15e296e31df..654c2cfdb9c0 100644
+--- a/tools/lld/CMakeLists.txt
++++ b/tools/lld/CMakeLists.txt
+@@ -17,7 +17,7 @@ target_link_libraries(lld
+   )
+ 
+ install(TARGETS lld
+-  RUNTIME DESTINATION bin)
++  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+ 
+ if(NOT LLD_SYMLINKS_TO_CREATE)
+   set(LLD_SYMLINKS_TO_CREATE lld-link ld.lld ld64.lld wasm-ld)
diff --git a/pkgs/development/compilers/llvm/9/lldb/default.nix b/pkgs/development/compilers/llvm/9/lldb/default.nix
index d75acf135f3..6d753ce1a86 100644
--- a/pkgs/development/compilers/llvm/9/lldb/default.nix
+++ b/pkgs/development/compilers/llvm/9/lldb/default.nix
@@ -7,8 +7,8 @@
 , which
 , libedit
 , libxml2
-, llvm
-, clang-unwrapped
+, libllvm
+, libclang
 , python3
 , version
 , darwin
@@ -21,17 +21,20 @@ stdenv.mkDerivation rec {
 
   src = fetch pname "02gb3fbz09kyw8n71218v5v77ip559x3gqbcp8y3w6n3jpbryywa";
 
-  patches = [ ./procfs.patch ];
+  patches = [
+    ./procfs.patch
+    ./gnu-install-dirs.patch
+  ];
+
+  outputs = [ "out" "lib" "dev" ];
+
+  nativeBuildInputs = [
+    cmake python3 which swig lit
+  ];
 
-  nativeBuildInputs = [ cmake python3 which swig lit ];
   buildInputs = [
-    ncurses
-    zlib
-    libedit
-    libxml2
-    llvm
-  ]
-  ++ lib.optionals stdenv.isDarwin [
+    ncurses zlib libedit libxml2 libllvm
+  ] ++ lib.optionals stdenv.isDarwin [
     darwin.libobjc
     darwin.apple_sdk.libs.xpc
     darwin.apple_sdk.frameworks.Foundation
@@ -44,11 +47,17 @@ stdenv.mkDerivation rec {
   hardeningDisable = [ "format" ];
 
   cmakeFlags = [
-    "-DLLDB_CODESIGN_IDENTITY=" # codesigning makes nondeterministic
-    "-DClang_DIR=${clang-unwrapped}/lib/cmake"
+    "-DLLDB_INCLUDE_TESTS=${if doCheck then "YES" else "NO"}"
+    "-DClang_DIR=${libclang.dev}/lib/cmake"
     "-DLLVM_EXTERNAL_LIT=${lit}/bin/lit"
+    "-DLLDB_CODESIGN_IDENTITY=" # codesigning makes nondeterministic
+  ] ++ lib.optionals doCheck [
+    "-DLLDB_TEST_C_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
+    "-DLLDB_TEST_CXX_COMPILER=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}c++"
   ];
 
+  doCheck = false;
+
   postInstall = ''
     # man page
     mkdir -p $out/share/man/man1
@@ -58,13 +67,13 @@ stdenv.mkDerivation rec {
     # vscode:
     install -D ../tools/lldb-vscode/package.json $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/package.json
     mkdir -p $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
-    ln -s $out/bin/lldb-vscode $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
+    ln -s $out/bin/llvm-vscode $out/share/vscode/extensions/llvm-org.lldb-vscode-0.1.0/bin
   '';
 
   meta = with lib; {
     description = "A next-generation high-performance debugger";
-    homepage = "https://llvm.org/";
-    license = licenses.ncsa;
-    platforms = platforms.all;
+    homepage    = "https://llvm.org/";
+    license     = licenses.ncsa;
+    platforms   = platforms.all;
   };
 }
diff --git a/pkgs/development/compilers/llvm/9/lldb/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/9/lldb/gnu-install-dirs.patch
new file mode 100644
index 00000000000..cb4e400b367
--- /dev/null
+++ b/pkgs/development/compilers/llvm/9/lldb/gnu-install-dirs.patch
@@ -0,0 +1,65 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 5d52f6450657..a05130cf80b9 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -14,6 +14,8 @@ set(CMAKE_MODULE_PATH
+ # If we are not building as part of LLVM, build LLDB as a standalone project,
+ # using LLVM as an external library.
+ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
++  include(GNUInstallDirs)
++
+   include(LLDBStandalone)
+ endif()
+ 
+diff --git a/cmake/modules/AddLLDB.cmake b/cmake/modules/AddLLDB.cmake
+index 4c99278c583b..36d3640a6afc 100644
+--- a/cmake/modules/AddLLDB.cmake
++++ b/cmake/modules/AddLLDB.cmake
+@@ -94,13 +94,13 @@ function(add_lldb_library name)
+   endif()
+ 
+   if(PARAM_SHARED)
+-    set(install_dest lib${LLVM_LIBDIR_SUFFIX})
++    set(install_dest ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+     if(PARAM_INSTALL_PREFIX)
+       set(install_dest ${PARAM_INSTALL_PREFIX})
+     endif()
+     # RUNTIME is relevant for DLL platforms, FRAMEWORK for macOS
+     install(TARGETS ${name} COMPONENT ${name}
+-      RUNTIME DESTINATION bin
++      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+       LIBRARY DESTINATION ${install_dest}
+       ARCHIVE DESTINATION ${install_dest}
+       FRAMEWORK DESTINATION ${install_dest})
+diff --git a/cmake/modules/LLDBConfig.cmake b/cmake/modules/LLDBConfig.cmake
+index e1a133709ff2..357b4bb4492a 100644
+--- a/cmake/modules/LLDBConfig.cmake
++++ b/cmake/modules/LLDBConfig.cmake
+@@ -335,7 +335,7 @@ include_directories(BEFORE
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+@@ -345,7 +345,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/
+     COMPONENT lldb-headers
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+diff --git a/tools/intel-features/CMakeLists.txt b/tools/intel-features/CMakeLists.txt
+index b5316540fdf3..3c3c882d503f 100644
+--- a/tools/intel-features/CMakeLists.txt
++++ b/tools/intel-features/CMakeLists.txt
+@@ -64,4 +64,4 @@ if (NOT LLDB_DISABLE_PYTHON AND LLDB_BUILD_INTEL_PT)
+ endif()
+ 
+ install(TARGETS lldbIntelFeatures
+-  LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
diff --git a/pkgs/development/compilers/llvm/9/llvm/default.nix b/pkgs/development/compilers/llvm/9/llvm/default.nix
index b795f07d472..78d8d7b30ef 100644
--- a/pkgs/development/compilers/llvm/9/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/9/llvm/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv
+, pkgsBuildBuild
 , fetch
 , cmake
 , python3
@@ -10,10 +11,10 @@
 , version
 , release_version
 , zlib
-, buildPackages
+, buildLlvmTools
 , debugVersion ? false
 , enableManpages ? false
-, enableSharedLibraries ? true
+, enableSharedLibraries ? !stdenv.hostPlatform.isStatic
 , enablePFM ? !(stdenv.isDarwin
   || stdenv.isAarch64 # broken for Ampere eMAG 8180 (c2.large.arm on Packet) #56245
   || stdenv.isAarch32 # broken for the armv7l builder
@@ -44,8 +45,7 @@ in stdenv.mkDerivation (rec {
     mv polly-* $sourceRoot/tools/polly
   '';
 
-  outputs = [ "out" "python" ]
-    ++ optional enableSharedLibraries "lib";
+  outputs = [ "out" "lib" "dev" "python" ];
 
   nativeBuildInputs = [ cmake python3 ]
     ++ optionals enableManpages [ python3.pkgs.sphinx python3.pkgs.recommonmark ];
@@ -55,10 +55,14 @@ in stdenv.mkDerivation (rec {
 
   propagatedBuildInputs = [ ncurses zlib ];
 
+  patches = [
+    ./gnu-install-dirs.patch
+  ] ++ lib.optional enablePolly ./gnu-install-dirs-polly.patch;
+
   postPatch = optionalString stdenv.isDarwin ''
     substituteInPlace cmake/modules/AddLLVM.cmake \
       --replace 'set(_install_name_dir INSTALL_NAME_DIR "@rpath")' "set(_install_name_dir)" \
-      --replace 'set(_install_rpath "@loader_path/../lib" ''${extra_libdir})' ""
+      --replace 'set(_install_rpath "@loader_path/../''${CMAKE_INSTALL_LIBDIR}" ''${extra_libdir})' ""
   ''
   # Patch llvm-config to return correct library path based on --link-{shared,static}.
   + optionalString (enableSharedLibraries) ''
@@ -104,6 +108,7 @@ in stdenv.mkDerivation (rec {
   '';
 
   cmakeFlags = with stdenv; [
+    "-DLLVM_INSTALL_CMAKE_DIR=${placeholder "dev"}/lib/cmake/llvm/"
     "-DCMAKE_BUILD_TYPE=${if debugVersion then "Debug" else "Release"}"
     "-DLLVM_INSTALL_UTILS=ON"  # Needed by rustc
     "-DLLVM_BUILD_TESTS=ON"
@@ -127,7 +132,20 @@ in stdenv.mkDerivation (rec {
     "-DCAN_TARGET_i386=false"
   ] ++ optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
     "-DCMAKE_CROSSCOMPILING=True"
-    "-DLLVM_TABLEGEN=${buildPackages.llvm_9}/bin/llvm-tblgen"
+    "-DLLVM_TABLEGEN=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+    (
+      let
+        nativeCC = pkgsBuildBuild.targetPackages.stdenv.cc;
+        nativeBintools = nativeCC.bintools.bintools;
+        nativeToolchainFlags = [
+          "-DCMAKE_C_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}cc"
+          "-DCMAKE_CXX_COMPILER=${nativeCC}/bin/${nativeCC.targetPrefix}c++"
+          "-DCMAKE_AR=${nativeBintools}/bin/${nativeBintools.targetPrefix}ar"
+          "-DCMAKE_STRIP=${nativeBintools}/bin/${nativeBintools.targetPrefix}strip"
+          "-DCMAKE_RANLIB=${nativeBintools}/bin/${nativeBintools.targetPrefix}ranlib"
+        ];
+      in "-DCROSS_TOOLCHAIN_FLAGS_NATIVE:list=${lib.concatStringsSep ";" nativeToolchainFlags}"
+    )
   ];
 
   postBuild = ''
@@ -141,18 +159,19 @@ in stdenv.mkDerivation (rec {
   postInstall = ''
     mkdir -p $python/share
     mv $out/share/opt-viewer $python/share/opt-viewer
-  ''
-  + optionalString enableSharedLibraries ''
-    moveToOutput "lib/libLLVM-*" "$lib"
-    moveToOutput "lib/libLLVM${stdenv.hostPlatform.extensions.sharedLibrary}" "$lib"
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM-" "$lib/lib/libLLVM-"
+    moveToOutput "bin/llvm-config*" "$dev"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
+      --replace "\''${_IMPORT_PREFIX}/lib/lib" "$lib/lib/lib" \
+      --replace "$out/bin/llvm-config" "$dev/bin/llvm-config"
+    substituteInPlace "$dev/lib/cmake/llvm/LLVMConfig.cmake" \
+      --replace 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}")' 'set(LLVM_BINARY_DIR "''${LLVM_INSTALL_PREFIX}'"$lib"'")'
   ''
   + optionalString (stdenv.isDarwin && enableSharedLibraries) ''
-    substituteInPlace "$out/lib/cmake/llvm/LLVMExports-${if debugVersion then "debug" else "release"}.cmake" \
-      --replace "\''${_IMPORT_PREFIX}/lib/libLLVM.dylib" "$lib/lib/libLLVM.dylib"
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${shortVersion}.dylib
     ln -s $lib/lib/libLLVM.dylib $lib/lib/libLLVM-${release_version}.dylib
+  ''
+  + optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    cp NATIVE/bin/llvm-config $dev/bin/llvm-config-native
   '';
 
   doCheck = stdenv.isLinux && (!stdenv.isx86_32);
diff --git a/pkgs/development/compilers/llvm/9/llvm/gnu-install-dirs-polly.patch b/pkgs/development/compilers/llvm/9/llvm/gnu-install-dirs-polly.patch
new file mode 100644
index 00000000000..7c477c7df58
--- /dev/null
+++ b/pkgs/development/compilers/llvm/9/llvm/gnu-install-dirs-polly.patch
@@ -0,0 +1,106 @@
+diff --git a/tools/polly/CMakeLists.txt b/tools/polly/CMakeLists.txt
+index 9939097f743e..8cc538da912a 100644
+--- a/tools/polly/CMakeLists.txt
++++ b/tools/polly/CMakeLists.txt
+@@ -2,7 +2,11 @@
+ if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   project(Polly)
+   cmake_minimum_required(VERSION 3.4.3)
++endif()
++
++include(GNUInstallDirs)
+ 
++if (NOT DEFINED LLVM_MAIN_SRC_DIR)
+   # Where is LLVM installed?
+   find_package(LLVM CONFIG REQUIRED)
+   set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
+@@ -145,14 +149,14 @@ include_directories(
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN ".svn" EXCLUDE
+     )
+ 
+   install(DIRECTORY ${POLLY_BINARY_DIR}/include/
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     FILES_MATCHING
+     PATTERN "*.h"
+     PATTERN "CMakeFiles" EXCLUDE
+diff --git a/tools/polly/cmake/CMakeLists.txt b/tools/polly/cmake/CMakeLists.txt
+index 211f95512717..f9e04a4844b6 100644
+--- a/tools/polly/cmake/CMakeLists.txt
++++ b/tools/polly/cmake/CMakeLists.txt
+@@ -79,18 +79,18 @@ file(GENERATE
+ 
+ # Generate PollyConfig.cmake for the install tree.
+ unset(POLLY_EXPORTS)
+-set(POLLY_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}")
++set(POLLY_INSTALL_PREFIX "")
+ set(POLLY_CONFIG_LLVM_CMAKE_DIR "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
+-set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}")
++set(POLLY_CONFIG_CMAKE_DIR "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_PREFIX}/${POLLY_INSTALL_PACKAGE_DIR}")
++set(POLLY_CONFIG_LIBRARY_DIRS "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+ if (POLLY_BUNDLED_ISL)
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
+-    "${POLLY_INSTALL_PREFIX}/include/polly"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_LIBDIR}/polly"
+     )
+ else()
+   set(POLLY_CONFIG_INCLUDE_DIRS
+-    "${POLLY_INSTALL_PREFIX}/include"
++    "${POLLY_INSTALL_PREFIX}${CMAKE_INSTALL_FULL_INCLUDEDIR}"
+     ${ISL_INCLUDE_DIRS}
+     )
+ endif()
+@@ -100,12 +100,12 @@ endif()
+ foreach(tgt IN LISTS POLLY_CONFIG_EXPORTED_TARGETS)
+   get_target_property(tgt_type ${tgt} TYPE)
+   if (tgt_type STREQUAL "EXECUTABLE")
+-    set(tgt_prefix "bin/")
++    set(tgt_prefix "${CMAKE_INSTALL_BINDIR}/")
+   else()
+-    set(tgt_prefix "lib/")
++    set(tgt_prefix "${CMAKE_INSTALL_LIBDIR}/")
+   endif()
+ 
+-  set(tgt_path "${CMAKE_INSTALL_PREFIX}/${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
++  set(tgt_path "${tgt_prefix}$<TARGET_FILE_NAME:${tgt}>")
+   file(RELATIVE_PATH tgt_path ${POLLY_CONFIG_CMAKE_DIR} ${tgt_path})
+ 
+   if (NOT tgt_type STREQUAL "INTERFACE_LIBRARY")
+diff --git a/tools/polly/cmake/polly_macros.cmake b/tools/polly/cmake/polly_macros.cmake
+index e48203871884..5bc8a2a52541 100644
+--- a/tools/polly/cmake/polly_macros.cmake
++++ b/tools/polly/cmake/polly_macros.cmake
+@@ -44,8 +44,8 @@ macro(add_polly_library name)
+   if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "LLVMPolly")
+     install(TARGETS ${name}
+       EXPORT LLVMExports
+-      LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+-      ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX})
++	  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}
++      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   endif()
+   set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${name})
+ endmacro(add_polly_library)
+diff --git a/tools/polly/lib/External/CMakeLists.txt b/tools/polly/lib/External/CMakeLists.txt
+index 8ffd984e542b..261cc19f3238 100644
+--- a/tools/polly/lib/External/CMakeLists.txt
++++ b/tools/polly/lib/External/CMakeLists.txt
+@@ -274,7 +274,7 @@ if (POLLY_BUNDLED_ISL)
+     install(DIRECTORY
+       ${ISL_SOURCE_DIR}/include/
+       ${ISL_BINARY_DIR}/include/
+-      DESTINATION include/polly
++      DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/polly
+       FILES_MATCHING
+       PATTERN "*.h"
+       PATTERN "CMakeFiles" EXCLUDE
diff --git a/pkgs/development/compilers/llvm/9/llvm/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/9/llvm/gnu-install-dirs.patch
new file mode 100644
index 00000000000..380cc3f6df3
--- /dev/null
+++ b/pkgs/development/compilers/llvm/9/llvm/gnu-install-dirs.patch
@@ -0,0 +1,395 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index b9a10685b99f..c2750500df99 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -242,15 +242,21 @@ if (CMAKE_BUILD_TYPE AND
+   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
+ endif()
+ 
++include(GNUInstallDirs)
++
+ set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
+ 
+-set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
++set(LLVM_TOOLS_INSTALL_DIR "${CMAKE_INSTALL_BINDIR}" CACHE STRING
++    "Path for binary subdirectory (defaults to 'bin')")
+ mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+ 
+ set(LLVM_UTILS_INSTALL_DIR "${LLVM_TOOLS_INSTALL_DIR}" CACHE STRING
+     "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
+ mark_as_advanced(LLVM_UTILS_INSTALL_DIR)
+ 
++set(LLVM_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}/cmake/llvm" CACHE STRING
++	"Path for CMake subdirectory (defaults to lib/cmake/llvm)" )
++
+ # They are used as destination of target generators.
+ set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
+ set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
+@@ -534,9 +540,9 @@ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
+ option (LLVM_ENABLE_OCAMLDOC "Build OCaml bindings documentation." ON)
+ option (LLVM_ENABLE_BINDINGS "Build bindings." ON)
+ 
+-set(LLVM_INSTALL_DOXYGEN_HTML_DIR "share/doc/llvm/doxygen-html"
++set(LLVM_INSTALL_DOXYGEN_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html"
+     CACHE STRING "Doxygen-generated HTML documentation install directory")
+-set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
++set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html"
+     CACHE STRING "OCamldoc-generated HTML documentation install directory")
+ 
+ option (LLVM_BUILD_EXTERNAL_COMPILER_RT
+@@ -1002,7 +1008,7 @@ endif()
+ 
+ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+   install(DIRECTORY include/llvm include/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -1014,7 +1020,7 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+     )
+ 
+   install(DIRECTORY ${LLVM_INCLUDE_DIR}/llvm ${LLVM_INCLUDE_DIR}/llvm-c
+-    DESTINATION include
++    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+     COMPONENT llvm-headers
+     FILES_MATCHING
+     PATTERN "*.def"
+@@ -1029,13 +1035,13 @@ if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
+ 
+   if (LLVM_INSTALL_MODULEMAPS)
+     install(DIRECTORY include/llvm include/llvm-c
+-            DESTINATION include
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
+             COMPONENT llvm-headers
+             FILES_MATCHING
+             PATTERN "module.modulemap"
+             )
+     install(FILES include/llvm/module.install.modulemap
+-            DESTINATION include/llvm
++            DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm
+             COMPONENT llvm-headers
+             RENAME "module.extern.modulemap"
+             )
+diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
+index 619e986b8aa0..842b4f71d07e 100644
+--- a/cmake/modules/AddLLVM.cmake
++++ b/cmake/modules/AddLLVM.cmake
+@@ -697,9 +697,9 @@ macro(add_llvm_library name)
+ 
+       install(TARGETS ${name}
+               ${export_to_llvmexports}
+-              LIBRARY DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+-              ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
+-              RUNTIME DESTINATION bin COMPONENT ${name})
++              LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
++              ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX} COMPONENT ${name}
++              RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ${name})
+ 
+       if (NOT LLVM_ENABLE_IDE)
+         add_llvm_install_targets(install-${name}
+@@ -930,7 +930,7 @@ macro(add_llvm_example name)
+   endif()
+   add_llvm_executable(${name} ${ARGN})
+   if( LLVM_BUILD_EXAMPLES )
+-    install(TARGETS ${name} RUNTIME DESTINATION examples)
++    install(TARGETS ${name} RUNTIME DESTINATION ${CMAKE_INSTALL_DOCDIR}/examples)
+   endif()
+   set_target_properties(${name} PROPERTIES FOLDER "Examples")
+ endmacro(add_llvm_example name)
+@@ -1485,7 +1485,7 @@ function(llvm_install_library_symlink name dest type)
+   set(full_name ${CMAKE_${type}_LIBRARY_PREFIX}${name}${CMAKE_${type}_LIBRARY_SUFFIX})
+   set(full_dest ${CMAKE_${type}_LIBRARY_PREFIX}${dest}${CMAKE_${type}_LIBRARY_SUFFIX})
+ 
+-  set(output_dir lib${LLVM_LIBDIR_SUFFIX})
++  set(output_dir ${CMAKE_INSTALL_FULL_LIBDIR}${LLVM_LIBDIR_SUFFIX})
+   if(WIN32 AND "${type}" STREQUAL "SHARED")
+     set(output_dir bin)
+   endif()
+@@ -1501,7 +1501,7 @@ function(llvm_install_library_symlink name dest type)
+   endif()
+ endfunction()
+ 
+-function(llvm_install_symlink name dest)
++function(llvm_install_symlink name dest output_dir)
+   cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
+   foreach(path ${CMAKE_MODULE_PATH})
+     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
+@@ -1524,7 +1524,7 @@ function(llvm_install_symlink name dest)
+   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
+ 
+   install(SCRIPT ${INSTALL_SYMLINK}
+-          CODE "install_symlink(${full_name} ${full_dest} ${LLVM_TOOLS_INSTALL_DIR})"
++          CODE "install_symlink(${full_name} ${full_dest} ${output_dir})"
+           COMPONENT ${component})
+ 
+   if (NOT LLVM_ENABLE_IDE AND NOT ARG_ALWAYS_GENERATE)
+@@ -1606,7 +1606,8 @@ function(add_llvm_tool_symlink link_name target)
+     endif()
+ 
+     if ((TOOL_IS_TOOLCHAIN OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY) AND LLVM_BUILD_TOOLS)
+-      llvm_install_symlink(${link_name} ${target})
++      GNUInstallDirs_get_absolute_install_dir(output_dir LLVM_TOOLS_INSTALL_DIR)
++      llvm_install_symlink(${link_name} ${target} ${output_dir})
+     endif()
+   endif()
+ endfunction()
+@@ -1728,9 +1729,9 @@ function(llvm_setup_rpath name)
+ 
+   if (APPLE)
+     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
+-    set(_install_rpath "@loader_path/../lib" ${extra_libdir})
++    set(_install_rpath "@loader_path/../${CMAKE_INSTALL_LIBDIR}" ${extra_libdir})
+   elseif(UNIX)
+-    set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
++    set(_install_rpath "\$ORIGIN/../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")
+       set_property(TARGET ${name} APPEND_STRING PROPERTY
+                    LINK_FLAGS " -Wl,-z,origin ")
+diff --git a/cmake/modules/AddOCaml.cmake b/cmake/modules/AddOCaml.cmake
+index 02bab6846376..eff26adb2efc 100644
+--- a/cmake/modules/AddOCaml.cmake
++++ b/cmake/modules/AddOCaml.cmake
+@@ -140,9 +140,9 @@ function(add_ocaml_library name)
+   endforeach()
+ 
+   if( APPLE )
+-    set(ocaml_rpath "@executable_path/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "@executable_path/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   elseif( UNIX )
+-    set(ocaml_rpath "\\$ORIGIN/../../../lib${LLVM_LIBDIR_SUFFIX}")
++    set(ocaml_rpath "\\$ORIGIN/../../../${CMAKE_INSTALL_LIBDIR}${LLVM_LIBDIR_SUFFIX}")
+   endif()
+   list(APPEND ocaml_flags "-ldopt" "-Wl,-rpath,${ocaml_rpath}")
+ 
+diff --git a/cmake/modules/AddSphinxTarget.cmake b/cmake/modules/AddSphinxTarget.cmake
+index 22e3dcb776aa..ba77b9c195e2 100644
+--- a/cmake/modules/AddSphinxTarget.cmake
++++ b/cmake/modules/AddSphinxTarget.cmake
+@@ -73,7 +73,7 @@ function (add_sphinx_target builder project)
+ 
+       elseif (builder STREQUAL html)
+         string(TOUPPER "${project}" project_upper)
+-        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "share/doc/${project}/html"
++        set(${project_upper}_INSTALL_SPHINX_HTML_DIR "${CMAKE_INSTALL_DOCDIR}/${project}/html"
+             CACHE STRING "HTML documentation install directory for ${project}")
+ 
+         # '/.' indicates: copy the contents of the directory directly into
+diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
+index 9cf22b436fa7..486e40010cd8 100644
+--- a/cmake/modules/CMakeLists.txt
++++ b/cmake/modules/CMakeLists.txt
+@@ -1,4 +1,4 @@
+-set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)
++set(LLVM_INSTALL_PACKAGE_DIR ${LLVM_INSTALL_CMAKE_DIR} CACHE STRING "Path for CMake subdirectory (defaults to 'cmake/llvm')")
+ set(llvm_cmake_builddir "${LLVM_BINARY_DIR}/${LLVM_INSTALL_PACKAGE_DIR}")
+ 
+ # First for users who use an installed LLVM, create the LLVMExports.cmake file.
+@@ -96,13 +96,13 @@ foreach(p ${_count})
+   set(LLVM_CONFIG_CODE "${LLVM_CONFIG_CODE}
+ get_filename_component(LLVM_INSTALL_PREFIX \"\${LLVM_INSTALL_PREFIX}\" PATH)")
+ endforeach(p)
+-set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/include")
++set(LLVM_CONFIG_INCLUDE_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
+ set(LLVM_CONFIG_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
+ set(LLVM_CONFIG_MAIN_INCLUDE_DIR "${LLVM_CONFIG_INCLUDE_DIRS}")
+-set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/lib\${LLVM_LIBDIR_SUFFIX}")
++set(LLVM_CONFIG_LIBRARY_DIRS "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}\${LLVM_LIBDIR_SUFFIX}")
+ set(LLVM_CONFIG_CMAKE_DIR "\${LLVM_INSTALL_PREFIX}/${LLVM_INSTALL_PACKAGE_DIR}")
+ set(LLVM_CONFIG_BINARY_DIR "\${LLVM_INSTALL_PREFIX}")
+-set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/bin")
++set(LLVM_CONFIG_TOOLS_BINARY_DIR "\${LLVM_INSTALL_PREFIX}/${CMAKE_INSTALL_BINDIR}")
+ set(LLVM_CONFIG_EXPORTS_FILE "\${LLVM_CMAKE_DIR}/LLVMExports.cmake")
+ set(LLVM_CONFIG_EXPORTS "${LLVM_EXPORTS}")
+ configure_file(
+diff --git a/cmake/modules/LLVMInstallSymlink.cmake b/cmake/modules/LLVMInstallSymlink.cmake
+index 09fed8085c23..aa79f192abf0 100644
+--- a/cmake/modules/LLVMInstallSymlink.cmake
++++ b/cmake/modules/LLVMInstallSymlink.cmake
+@@ -10,7 +10,7 @@ function(install_symlink name target outdir)
+     set(LINK_OR_COPY copy)
+   endif()
+ 
+-  set(bindir "${DESTDIR}${CMAKE_INSTALL_PREFIX}/${outdir}/")
++  set(bindir "${DESTDIR}${outdir}/")
+ 
+   message(STATUS "Creating ${name}")
+ 
+diff --git a/docs/CMake.rst b/docs/CMake.rst
+index 91fb5282206f..d2c9fd94d131 100644
+--- a/docs/CMake.rst
++++ b/docs/CMake.rst
+@@ -196,7 +196,7 @@ CMake manual, or execute ``cmake --help-variable VARIABLE_NAME``.
+ **LLVM_LIBDIR_SUFFIX**:STRING
+   Extra suffix to append to the directory where libraries are to be
+   installed. On a 64-bit architecture, one could use ``-DLLVM_LIBDIR_SUFFIX=64``
+-  to install libraries to ``/usr/lib64``.
++  to install libraries to ``/usr/lib64``. See also ``CMAKE_INSTALL_LIBDIR``.
+ 
+ **CMAKE_C_FLAGS**:STRING
+   Extra flags to use when compiling C source files.
+@@ -492,8 +492,8 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_DOXYGEN_HTML_DIR**:STRING
+   The path to install Doxygen-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/doxygen-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/doxygen-html`.
+ 
+ **LLVM_ENABLE_SPHINX**:BOOL
+   If specified, CMake will search for the ``sphinx-build`` executable and will make
+@@ -524,13 +524,33 @@ LLVM-specific variables
+ 
+ **LLVM_INSTALL_SPHINX_HTML_DIR**:STRING
+   The path to install Sphinx-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/html`.
+ 
+ **LLVM_INSTALL_OCAMLDOC_HTML_DIR**:STRING
+   The path to install OCamldoc-generated HTML documentation to. This path can
+-  either be absolute or relative to the CMAKE_INSTALL_PREFIX. Defaults to
+-  `share/doc/llvm/ocaml-html`.
++  either be absolute or relative to the ``CMAKE_INSTALL_PREFIX``. Defaults to
++  `${CMAKE_INSTALL_DOCDIR}/${project}/ocaml-html`.
++
++**CMAKE_INSTALL_BINDIR**:STRING
++  The path to install binary tools, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `bin`.
++
++**CMAKE_INSTALL_LIBDIR**:STRING
++  The path to install libraries, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `lib`.
++
++**CMAKE_INSTALL_INCLUDEDIR**:STRING
++  The path to install header files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `include`.
++
++**CMAKE_INSTALL_DOCDIR**:STRING
++  The path to install documentation, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/doc`.
++
++**CMAKE_INSTALL_MANDIR**:STRING
++  The path to install manpage files, relative to the ``CMAKE_INSTALL_PREFIX``.
++  Defaults to `share/man`.
+ 
+ **LLVM_CREATE_XCODE_TOOLCHAIN**:BOOL
+   macOS Only: If enabled CMake will generate a target named
+@@ -710,9 +730,11 @@ the ``cmake`` command or by setting it directly in ``ccmake`` or ``cmake-gui``).
+ 
+ This file is available in two different locations.
+ 
+-* ``<INSTALL_PREFIX>/lib/cmake/llvm/LLVMConfig.cmake`` where
+-  ``<INSTALL_PREFIX>`` is the install prefix of an installed version of LLVM.
+-  On Linux typically this is ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
++* ``<LLVM_INSTALL_PACKAGE_DIR>LLVMConfig.cmake`` where
++  ``<LLVM_INSTALL_PACKAGE_DIR>`` is the location where LLVM CMake modules are
++  installed as part of an installed version of LLVM. This is typically
++  ``cmake/llvm/`` within the lib directory. On Linux, this is typically
++  ``/usr/lib/cmake/llvm/LLVMConfig.cmake``.
+ 
+ * ``<LLVM_BUILD_ROOT>/lib/cmake/llvm/LLVMConfig.cmake`` where
+   ``<LLVM_BUILD_ROOT>`` is the root of the LLVM build tree. **Note: this is only
+diff --git a/include/llvm/CMakeLists.txt b/include/llvm/CMakeLists.txt
+index 1d5ca3ba92b0..026f5453c1da 100644
+--- a/include/llvm/CMakeLists.txt
++++ b/include/llvm/CMakeLists.txt
+@@ -4,5 +4,5 @@ add_subdirectory(Support)
+ # If we're doing an out-of-tree build, copy a module map for generated
+ # header files into the build area.
+ if (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+-  configure_file(module.modulemap.build module.modulemap COPYONLY)
++  configure_file(module.modulemap.build ${LLVM_INCLUDE_DIR}/module.modulemap COPYONLY)
+ endif (NOT "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_BINARY_DIR}")
+diff --git a/tools/llvm-config/BuildVariables.inc.in b/tools/llvm-config/BuildVariables.inc.in
+index 3a24d3e974e1..987d82c1bb97 100644
+--- a/tools/llvm-config/BuildVariables.inc.in
++++ b/tools/llvm-config/BuildVariables.inc.in
+@@ -23,6 +23,10 @@
+ #define LLVM_CXXFLAGS "@LLVM_CXXFLAGS@"
+ #define LLVM_BUILDMODE "@LLVM_BUILDMODE@"
+ #define LLVM_LIBDIR_SUFFIX "@LLVM_LIBDIR_SUFFIX@"
++#define LLVM_INSTALL_BINDIR "@CMAKE_INSTALL_BINDIR@"
++#define LLVM_INSTALL_LIBDIR "@CMAKE_INSTALL_LIBDIR@"
++#define LLVM_INSTALL_INCLUDEDIR "@CMAKE_INSTALL_INCLUDEDIR@"
++#define LLVM_INSTALL_CMAKEDIR "@LLVM_INSTALL_CMAKE_DIR@"
+ #define LLVM_TARGETS_BUILT "@LLVM_TARGETS_BUILT@"
+ #define LLVM_SYSTEM_LIBS "@LLVM_SYSTEM_LIBS@"
+ #define LLVM_BUILD_SYSTEM "@LLVM_BUILD_SYSTEM@"
+diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
+index 7ef7c46a2627..1f71f8b0f820 100644
+--- a/tools/llvm-config/llvm-config.cpp
++++ b/tools/llvm-config/llvm-config.cpp
+@@ -332,12 +332,26 @@ int main(int argc, char **argv) {
+         ("-I" + ActiveIncludeDir + " " + "-I" + ActiveObjRoot + "/include");
+   } else {
+     ActivePrefix = CurrentExecPrefix;
+-    ActiveIncludeDir = ActivePrefix + "/include";
+-    SmallString<256> path(StringRef(LLVM_TOOLS_INSTALL_DIR));
+-    sys::fs::make_absolute(ActivePrefix, path);
+-    ActiveBinDir = path.str();
+-    ActiveLibDir = ActivePrefix + "/lib" + LLVM_LIBDIR_SUFFIX;
+-    ActiveCMakeDir = ActiveLibDir + "/cmake/llvm";
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_INCLUDEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveIncludeDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_BINDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveBinDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_LIBDIR LLVM_LIBDIR_SUFFIX));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveLibDir = std::string(path.str());
++    }
++    {
++      SmallString<256> path(StringRef(LLVM_INSTALL_CMAKEDIR));
++      sys::fs::make_absolute(ActivePrefix, path);
++      ActiveCMakeDir = std::string(path.str());
++    }
+     ActiveIncludeOption = "-I" + ActiveIncludeDir;
+   }
+ 
+diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
+index b86e4abd01a7..02ce5773f17d 100644
+--- a/tools/lto/CMakeLists.txt
++++ b/tools/lto/CMakeLists.txt
+@@ -23,7 +23,7 @@ set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/lto.exports)
+ add_llvm_library(LTO SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES} DEPENDS intrinsics_gen)
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/lto.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT LTO)
+ 
+ if (APPLE)
+diff --git a/tools/opt-viewer/CMakeLists.txt b/tools/opt-viewer/CMakeLists.txt
+index 19b606933082..27b9f71b3d79 100644
+--- a/tools/opt-viewer/CMakeLists.txt
++++ b/tools/opt-viewer/CMakeLists.txt
+@@ -8,6 +8,6 @@ set (files
+ 
+ foreach (file ${files})
+   install(PROGRAMS ${file}
+-    DESTINATION share/opt-viewer
++    DESTINATION ${CMAKE_INSTALL_DATADIR}/opt-viewer
+     COMPONENT opt-viewer)
+ endforeach (file)
+diff --git a/tools/remarks-shlib/CMakeLists.txt b/tools/remarks-shlib/CMakeLists.txt
+index e948496c603a..1f4df8a98b10 100644
+--- a/tools/remarks-shlib/CMakeLists.txt
++++ b/tools/remarks-shlib/CMakeLists.txt
+@@ -11,7 +11,7 @@ set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_CURRENT_SOURCE_DIR}/Remarks.exports)
+ add_llvm_library(Remarks SHARED INSTALL_WITH_TOOLCHAIN ${SOURCES})
+ 
+ install(FILES ${LLVM_MAIN_INCLUDE_DIR}/llvm-c/Remarks.h
+-  DESTINATION include/llvm-c
++  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/llvm-c
+   COMPONENT Remarks)
+ 
+ if (APPLE)
diff --git a/pkgs/development/compilers/llvm/rocm/default.nix b/pkgs/development/compilers/llvm/rocm/default.nix
index 6a11ded0529..581d0574671 100644
--- a/pkgs/development/compilers/llvm/rocm/default.nix
+++ b/pkgs/development/compilers/llvm/rocm/default.nix
@@ -1,4 +1,4 @@
-{ lib, fetchFromGitHub, callPackage, wrapCCWith }:
+{ lib, buildPackages, fetchFromGitHub, callPackage, wrapCCWith }:
 
 let
   version = "4.1.0";
@@ -15,7 +15,7 @@ in rec {
       clang_version=`${cc}/bin/clang -v 2>&1 | grep "clang version " | grep -E -o "[0-9.-]+"`
       rsrc="$out/resource-root"
       mkdir "$rsrc"
-      ln -s "${cc}/lib/clang/$clang_version/include" "$rsrc"
+      ln -s "${lib.getLib cc}/lib/clang/$clang_version/include" "$rsrc"
       echo "-resource-dir=$rsrc" >> $out/nix-support/cc-cflags
       echo "-Wno-unused-command-line-argument" >> $out/nix-support/cc-cflags
       rm $out/nix-support/add-hardening.sh
@@ -31,6 +31,7 @@ in rec {
   lld = callPackage ./lld {
     inherit llvm version;
     src = "${src}/lld";
+    buildLlvmTools = buildPackages.llvmPackages_rocm;
   };
 
   llvm = callPackage ./llvm {
diff --git a/pkgs/development/compilers/llvm/rocm/lld/default.nix b/pkgs/development/compilers/llvm/rocm/lld/default.nix
index a6e993bb203..ef60747b013 100644
--- a/pkgs/development/compilers/llvm/rocm/lld/default.nix
+++ b/pkgs/development/compilers/llvm/rocm/lld/default.nix
@@ -1,4 +1,5 @@
 { lib, stdenv
+, buildLlvmTools
 , cmake
 , libxml2
 , llvm
@@ -13,12 +14,17 @@ stdenv.mkDerivation rec {
   pname = "lld";
 
   nativeBuildInputs = [ cmake ];
-
   buildInputs = [ libxml2 llvm ];
 
-  outputs = [ "out" "dev" ];
 
-  cmakeFlags = [ "-DLLVM_MAIN_SRC_DIR=${llvm.src}" ];
+  cmakeFlags = [
+    "-DLLVM_MAIN_SRC_DIR=${llvm.src}"
+  ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
+    "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
+    "-DLLVM_CONFIG_PATH=${llvm.dev}/bin/llvm-config-native"
+  ];
+
+  outputs = [ "out" "dev" ];
 
   postInstall = ''
     moveToOutput include "$dev"
diff --git a/pkgs/development/compilers/llvm/rocm/llvm/default.nix b/pkgs/development/compilers/llvm/rocm/llvm/default.nix
index 62559bf1392..b3e8c06195f 100644
--- a/pkgs/development/compilers/llvm/rocm/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/rocm/llvm/default.nix
@@ -9,7 +9,7 @@
 , zlib
 , debugVersion ? false
 , enableManpages ? false
-, enableSharedLibraries ? true
+, enableSharedLibraries ? !stdenv.hostPlatform.isStatic
 
 , version
 , src
diff --git a/pkgs/development/compilers/mrustc/bootstrap.nix b/pkgs/development/compilers/mrustc/bootstrap.nix
index 35e7daaf210..85b328848b1 100644
--- a/pkgs/development/compilers/mrustc/bootstrap.nix
+++ b/pkgs/development/compilers/mrustc/bootstrap.nix
@@ -78,7 +78,7 @@ stdenv.mkDerivation rec {
     # Use shared mrustc/minicargo/llvm instead of rebuilding them
     "MRUSTC=${mrustc}/bin/mrustc"
     "MINICARGO=${mrustc-minicargo}/bin/minicargo"
-    "LLVM_CONFIG=${llvm_7}/bin/llvm-config"
+    "LLVM_CONFIG=${llvm_7.dev}/bin/llvm-config"
     "RUSTC_TARGET=${rust.toRustTarget stdenv.targetPlatform}"
   ];
 
diff --git a/pkgs/development/compilers/rust/1_45.nix b/pkgs/development/compilers/rust/1_45.nix
index 13b1b3ef488..f499fc9e9b0 100644
--- a/pkgs/development/compilers/rust/1_45.nix
+++ b/pkgs/development/compilers/rust/1_45.nix
@@ -20,9 +20,9 @@ import ./default.nix {
   rustcVersion = "1.45.2";
   rustcSha256 = "0273a1g3f59plyi1n0azf21qjzwml1yqdnj5z472crz37qggr8xp";
 
-  llvmSharedForBuild = pkgsBuildBuild.llvm_10.override { enableSharedLibraries = true; };
-  llvmSharedForHost = pkgsBuildHost.llvm_10.override { enableSharedLibraries = true; };
-  llvmSharedForTarget = pkgsBuildTarget.llvm_10.override { enableSharedLibraries = true; };
+  llvmSharedForBuild = pkgsBuildBuild.llvmPackages_10.libllvm.override { enableSharedLibraries = true; };
+  llvmSharedForHost = pkgsBuildHost.llvmPackages_10.libllvm.override { enableSharedLibraries = true; };
+  llvmSharedForTarget = pkgsBuildTarget.llvmPackages_10.libllvm.override { enableSharedLibraries = true; };
 
   llvmBootstrapForDarwin = llvmPackages_5;
 
diff --git a/pkgs/development/compilers/rust/1_51.nix b/pkgs/development/compilers/rust/1_51.nix
index a489df471a8..17fafa4c7cb 100644
--- a/pkgs/development/compilers/rust/1_51.nix
+++ b/pkgs/development/compilers/rust/1_51.nix
@@ -22,9 +22,9 @@ import ./default.nix {
   rustcVersion = "1.51.0";
   rustcSha256 = "0ixqkqglv3isxbvl4ldr4byrkx692wghsz3fasy1pn5kr2prnsvs";
 
-  llvmSharedForBuild = pkgsBuildBuild.llvm_11.override { enableSharedLibraries = true; };
-  llvmSharedForHost = pkgsBuildHost.llvm_11.override { enableSharedLibraries = true; };
-  llvmSharedForTarget = pkgsBuildTarget.llvm_11.override { enableSharedLibraries = true; };
+  llvmSharedForBuild = pkgsBuildBuild.llvmPackages_11.libllvm.override { enableSharedLibraries = true; };
+  llvmSharedForHost = pkgsBuildHost.llvmPackages_11.libllvm.override { enableSharedLibraries = true; };
+  llvmSharedForTarget = pkgsBuildTarget.llvmPackages_11.libllvm.override { enableSharedLibraries = true; };
 
   llvmBootstrapForDarwin = llvmPackages_11;
 
diff --git a/pkgs/development/compilers/rust/rustc.nix b/pkgs/development/compilers/rust/rustc.nix
index 315fe7c0c6d..b9bccf9f16e 100644
--- a/pkgs/development/compilers/rust/rustc.nix
+++ b/pkgs/development/compilers/rust/rustc.nix
@@ -88,9 +88,9 @@ in stdenv.mkDerivation rec {
     "${setTarget}.cxx=${cxxForTarget}"
   ] ++ optionals (!withBundledLLVM) [
     "--enable-llvm-link-shared"
-    "${setBuild}.llvm-config=${llvmSharedForBuild}/bin/llvm-config"
-    "${setHost}.llvm-config=${llvmSharedForHost}/bin/llvm-config"
-    "${setTarget}.llvm-config=${llvmSharedForTarget}/bin/llvm-config"
+    "${setBuild}.llvm-config=${llvmSharedForBuild.dev}/bin/llvm-config"
+    "${setHost}.llvm-config=${llvmSharedForHost.dev}/bin/llvm-config"
+    "${setTarget}.llvm-config=${llvmSharedForTarget.dev}/bin/llvm-config"
   ] ++ optionals (stdenv.isLinux && !stdenv.targetPlatform.isRedox) [
     "--enable-profiler" # build libprofiler_builtins
   ] ++ optionals stdenv.buildPlatform.isMusl [
diff --git a/pkgs/development/compilers/spirv-llvm-translator/default.nix b/pkgs/development/compilers/spirv-llvm-translator/default.nix
index 324e0b07ad8..e4549a7d65d 100644
--- a/pkgs/development/compilers/spirv-llvm-translator/default.nix
+++ b/pkgs/development/compilers/spirv-llvm-translator/default.nix
@@ -1,6 +1,7 @@
 { lib, stdenv
 , fetchFromGitHub
 , cmake
+, pkg-config
 
 , lit
 , llvm_8
@@ -17,7 +18,7 @@ stdenv.mkDerivation rec {
     sha256 = "0hxalc3fkliqs61hpr97phbm3qsx4b8vgnlg30aimzr6aas403r5";
   };
 
-  nativeBuildInputs = [ cmake ];
+  nativeBuildInputs = [ pkg-config cmake llvm_8.dev ];
 
   buildInputs = [ llvm_8 ];
 
diff --git a/pkgs/development/compilers/zig/default.nix b/pkgs/development/compilers/zig/default.nix
index 41e63d63dbe..399cb62ba3d 100644
--- a/pkgs/development/compilers/zig/default.nix
+++ b/pkgs/development/compilers/zig/default.nix
@@ -19,13 +19,13 @@ llvmPackages.stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [
-    cmake
+    cmake llvmPackages.llvm.dev
   ];
   buildInputs = [
     libxml2
     zlib
   ] ++ (with llvmPackages; [
-    clang-unwrapped
+    libclang
     lld
     llvm
   ]);
diff --git a/pkgs/development/interpreters/cling/default.nix b/pkgs/development/interpreters/cling/default.nix
index dbc2751e789..73ed5b523dd 100644
--- a/pkgs/development/interpreters/cling/default.nix
+++ b/pkgs/development/interpreters/cling/default.nix
@@ -10,6 +10,7 @@
 , runCommandNoCC
 , llvmPackages_5
 , glibc
+, ncurses
 }:
 
 let
@@ -38,8 +39,8 @@ let
       chmod -R a+w ./tools/cling
     '';
 
-    nativeBuildInputs = [ python3 git cmake ];
-    buildInputs = [ libffi llvmPackages_5.llvm zlib ];
+    nativeBuildInputs = [ python3 git cmake llvmPackages_5.llvm.dev ];
+    buildInputs = [ libffi llvmPackages_5.llvm zlib ncurses ];
 
     strictDeps = true;
 
@@ -76,8 +77,8 @@ let
     "-nostdinc"
     "-nostdinc++"
     "-isystem" "${lib.getDev stdenv.cc.libc}/include"
-    "-I" "${unwrapped}/include"
-    "-I" "${unwrapped}/lib/clang/5.0.2/include"
+    "-I" "${lib.getDev unwrapped}/include"
+    "-I" "${lib.getLib unwrapped}/lib/clang/5.0.2/include"
   ];
 
   # Autodetect the include paths for the compiler used to build Cling, in the same way Cling does at
diff --git a/pkgs/development/interpreters/jruby/default.nix b/pkgs/development/interpreters/jruby/default.nix
index be1a1a15c84..4e540dc8aac 100644
--- a/pkgs/development/interpreters/jruby/default.nix
+++ b/pkgs/development/interpreters/jruby/default.nix
@@ -6,11 +6,11 @@ rubyVersion = callPackage ../ruby/ruby-version.nix {} "2" "5" "7" "";
 jruby = stdenv.mkDerivation rec {
   pname = "jruby";
 
-  version = "9.2.16.0";
+  version = "9.2.17.0";
 
   src = fetchurl {
     url = "https://s3.amazonaws.com/jruby.org/downloads/${version}/jruby-bin-${version}.tar.gz";
-    sha256 = "sha256-WuJ/FJ9z8/6k80NZy7dzwl2dmH5yte3snouTlXmX6zA=";
+    sha256 = "sha256-dwHTU3s6YG0nZaxtXEDmdd2qAdPOutJqIaZuOq3VwgI=";
   };
 
   nativeBuildInputs = [ makeWrapper ];
diff --git a/pkgs/development/interpreters/lua-5/default.nix b/pkgs/development/interpreters/lua-5/default.nix
index 43ed70fee1d..95b593fb5db 100644
--- a/pkgs/development/interpreters/lua-5/default.nix
+++ b/pkgs/development/interpreters/lua-5/default.nix
@@ -1,27 +1,12 @@
 # similar to interpreters/python/default.nix
 { stdenv, lib, callPackage, fetchurl, fetchpatch }:
-let
-  dsoPatch51 = fetchurl {
-    url = "https://projects.archlinux.org/svntogit/packages.git/plain/trunk/lua-arch.patch?h=packages/lua51";
-    sha256 = "11fcyb4q55p4p7kdb8yp85xlw8imy14kzamp2khvcyxss4vw8ipw";
-    name = "lua-arch.patch";
-  };
-
-  dsoPatch52 = fetchurl {
-    url = "https://projects.archlinux.org/svntogit/packages.git/plain/trunk/liblua.so.patch?h=packages/lua52";
-    sha256 = "1by1dy4ql61f5c6njq9ibf9kaqm3y633g2q8j54iyjr4cxvqwqz9";
-    name = "lua-arch.patch";
-  };
 
-in rec {
+rec {
   lua5_4 = callPackage ./interpreter.nix {
     sourceVersion = { major = "5"; minor = "4"; patch = "2"; };
     hash = "0ksj5zpj74n0jkamy3di1p6l10v4gjnd2zjnb453qc6px6bhsmqi";
-    patches = if stdenv.isDarwin then [ ./5.4.darwin.patch ] else [
-      # build lua as a shared library as well, MIT-licensed from
-      # https://github.com/archlinux/svntogit-packages/tree/packages/lua/trunk
-      ./liblua.so.patch
-    ];
+
+    patches = lib.optional stdenv.isDarwin ./5.4.darwin.patch;
   };
 
   lua5_4_compat = lua5_4.override({
@@ -35,11 +20,6 @@ in rec {
     patches =
       lib.optionals stdenv.isDarwin [ ./5.2.darwin.patch ];
 
-    postConfigure = lib.optionalString (!stdenv.isDarwin) ''
-      cat ${./lua-5.3-dso.make} >> src/Makefile
-      sed -e 's/ALL_T *= */& $(LUA_SO)/' -i src/Makefile
-    '';
-
     postBuild = lib.optionalString (!stdenv.isDarwin) ''
       ( cd src; make $makeFlags "''${makeFlagsArray[@]}" liblua.so )
     '';
@@ -53,7 +33,7 @@ in rec {
   lua5_2 = callPackage ./interpreter.nix {
     sourceVersion = { major = "5"; minor = "2"; patch = "4"; };
     hash = "0jwznq0l8qg9wh5grwg07b5cy3lzngvl5m2nl1ikp6vqssmf9qmr";
-    patches = if stdenv.isDarwin then [ ./5.2.darwin.patch ] else [ dsoPatch52 ];
+    patches = lib.optional stdenv.isDarwin ./5.2.darwin.patch;
   };
 
   lua5_2_compat = lua5_2.override({
@@ -64,7 +44,7 @@ in rec {
   lua5_1 = callPackage ./interpreter.nix {
     sourceVersion = { major = "5"; minor = "1"; patch = "5"; };
     hash = "2640fc56a795f29d28ef15e13c34a47e223960b0240e8cb0a82d9b0738695333";
-    patches = (if stdenv.isDarwin then [ ./5.1.darwin.patch ] else [ dsoPatch51 ])
+    patches = (lib.optional stdenv.isDarwin ./5.1.darwin.patch)
       ++ [ ./CVE-2014-5461.patch ];
   };
 
diff --git a/pkgs/development/interpreters/lua-5/interpreter.nix b/pkgs/development/interpreters/lua-5/interpreter.nix
index 35a074add09..fd8c47d751b 100644
--- a/pkgs/development/interpreters/lua-5/interpreter.nix
+++ b/pkgs/development/interpreters/lua-5/interpreter.nix
@@ -11,6 +11,15 @@
 let
 luaPackages = callPackage ../../lua-modules {lua=self; overrides=packageOverrides;};
 
+plat = if stdenv.isLinux then "linux"
+       else if stdenv.isDarwin then "macosx"
+       else if stdenv.hostPlatform.isMinGW then "mingw"
+       else if stdenv.isFreeBSD then "freebsd"
+       else if stdenv.isSunOS then "solaris"
+       else if stdenv.hostPlatform.isBSD then "bsd"
+       else if stdenv.hostPlatform.isUnix then "posix"
+       else "generic";
+
 self = stdenv.mkDerivation rec {
   pname = "lua";
   luaversion = with sourceVersion; "${major}.${minor}";
@@ -29,6 +38,14 @@ self = stdenv.mkDerivation rec {
 
   inherit patches;
 
+  postPatch = lib.optionalString (!stdenv.isDarwin) ''
+    # Add a target for a shared library to the Makefile.
+    sed -e '1s/^/LUA_SO = liblua.so/' \
+        -e 's/ALL_T *= */&$(LUA_SO) /' \
+        -i src/Makefile
+    cat ${./lua-dso.make} >> src/Makefile
+  '';
+
   # see configurePhase for additional flags (with space)
   makeFlags = [
     "INSTALL_TOP=${placeholder "out"}"
@@ -36,21 +53,17 @@ self = stdenv.mkDerivation rec {
     "R=${version}"
     "LDFLAGS=-fPIC"
     "V=${luaversion}"
-  ] ++ (if stdenv.isDarwin then [
-    "PLAT=macosx"
-  ] else [
-    "PLAT=linux"
-  ]) ++ (if stdenv.buildPlatform != stdenv.hostPlatform then [
-    "CC=${stdenv.hostPlatform.config}-gcc"
-    "RANLIB=${stdenv.hostPlatform.config}-ranlib"
-  ] else [])
-  ;
+    "PLAT=${plat}"
+    "CC=${stdenv.cc.targetPrefix}cc"
+    "RANLIB=${stdenv.cc.targetPrefix}ranlib"
+  ];
 
   configurePhase = ''
     runHook preConfigure
 
-    makeFlagsArray+=(CFLAGS="-DLUA_USE_LINUX -O2 -fPIC${if compat then " -DLUA_COMPAT_ALL" else ""}" )
-    makeFlagsArray+=(${lib.optionalString stdenv.isDarwin "CC=\"$CC\""}${lib.optionalString (stdenv.buildPlatform != stdenv.hostPlatform) " 'AR=${stdenv.hostPlatform.config}-ar rcu'"})
+    makeFlagsArray+=(CFLAGS='-O2 -fPIC${lib.optionalString compat " -DLUA_COMPAT_ALL"} $(${
+      if lib.versionAtLeast luaversion "5.2" then "SYSCFLAGS" else "MYCFLAGS"})' )
+    makeFlagsArray+=(${lib.optionalString stdenv.isDarwin "CC=\"$CC\""}${lib.optionalString (stdenv.buildPlatform != stdenv.hostPlatform) " 'AR=${stdenv.cc.targetPrefix}ar rcu'"})
 
     installFlagsArray=( TO_BIN="lua luac" INSTALL_DATA='cp -d' \
       TO_LIB="${if stdenv.isDarwin then "liblua.${version}.dylib" else "liblua.a liblua.so liblua.so.${luaversion} liblua.so.${version}"}" )
@@ -80,7 +93,7 @@ self = stdenv.mkDerivation rec {
     Description: An Extensible Extension Language
     Version: ${version}
     Requires:
-    Libs: -L$out/lib -llua -lm
+    Libs: -L$out/lib -llua
     Cflags: -I$out/include
     EOF
     ln -s "$out/lib/pkgconfig/lua.pc" "$out/lib/pkgconfig/lua-${luaversion}.pc"
diff --git a/pkgs/development/interpreters/lua-5/liblua.so.patch b/pkgs/development/interpreters/lua-5/liblua.so.patch
deleted file mode 100644
index 197832116c1..00000000000
--- a/pkgs/development/interpreters/lua-5/liblua.so.patch
+++ /dev/null
@@ -1,60 +0,0 @@
-diff --git a/Makefile b/Makefile
-index 416f444..eeaff03 100644
---- a/Makefile
-+++ b/Makefile
-@@ -52,7 +52,7 @@ R= $V.0
- all:	$(PLAT)
- 
- $(PLATS) help test clean:
--	@cd src && $(MAKE) $@
-+	@cd src && $(MAKE) $@ V=$(V) R=$(R)
- 
- install: dummy
- 	cd src && $(MKDIR) $(INSTALL_BIN) $(INSTALL_INC) $(INSTALL_LIB) $(INSTALL_MAN) $(INSTALL_LMOD) $(INSTALL_CMOD)
-diff --git a/src/Makefile b/src/Makefile
-index 514593d..372a6dc 100644
---- a/src/Makefile
-+++ b/src/Makefile
-@@ -33,6 +33,7 @@ CMCFLAGS= -Os
- PLATS= guess aix bsd c89 freebsd generic linux linux-readline macosx mingw posix solaris
- 
- LUA_A=	liblua.a
-+LUA_SO= liblua.so
- CORE_O=	lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o lmem.o lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o lundump.o lvm.o lzio.o
- LIB_O=	lauxlib.o lbaselib.o lcorolib.o ldblib.o liolib.o lmathlib.o loadlib.o loslib.o lstrlib.o ltablib.o lutf8lib.o linit.o
- BASE_O= $(CORE_O) $(LIB_O) $(MYOBJS)
-@@ -44,7 +45,7 @@ LUAC_T=	luac
- LUAC_O=	luac.o
- 
- ALL_O= $(BASE_O) $(LUA_O) $(LUAC_O)
--ALL_T= $(LUA_A) $(LUA_T) $(LUAC_T)
-+ALL_T= $(LUA_A) $(LUA_T) $(LUAC_T) $(LUA_SO)
- ALL_A= $(LUA_A)
- 
- # Targets start here.
-@@ -60,6 +61,12 @@ $(LUA_A): $(BASE_O)
- 	$(AR) $@ $(BASE_O)
- 	$(RANLIB) $@
- 
-+$(LUA_SO): $(CORE_O) $(LIB_O)
-+	$(CC) -shared -ldl -Wl,-soname,$(LUA_SO).$(V) -o $@.$(R) $? -lm $(MYLDFLAGS)
-+	ln -sf $(LUA_SO).$(R) $(LUA_SO).$(V)
-+	ln -sf $(LUA_SO).$(R) $(LUA_SO)
-+
-+
- $(LUA_T): $(LUA_O) $(LUA_A)
- 	$(CC) -o $@ $(LDFLAGS) $(LUA_O) $(LUA_A) $(LIBS)
- 
-diff --git a/src/luaconf.h b/src/luaconf.h
-index bdf927e..7e15198 100644
---- a/src/luaconf.h
-+++ b/src/luaconf.h
-@@ -227,7 +227,7 @@
- 
- #else			/* }{ */
- 
--#define LUA_ROOT	"/usr/local/"
-+#define LUA_ROOT	"/usr/"
- #define LUA_LDIR	LUA_ROOT "share/lua/" LUA_VDIR "/"
- #define LUA_CDIR	LUA_ROOT "lib/lua/" LUA_VDIR "/"
- 
diff --git a/pkgs/development/interpreters/lua-5/lua-5.3-dso.make b/pkgs/development/interpreters/lua-5/lua-dso.make
index c70dbc4f9cc..19c57685677 100644
--- a/pkgs/development/interpreters/lua-5/lua-5.3-dso.make
+++ b/pkgs/development/interpreters/lua-5/lua-dso.make
@@ -1,8 +1,4 @@
-
-LUA_SO=liblua.so
-
 $(LUA_SO): $(CORE_O) $(LIB_O)
-	$(CC) -shared -ldl -Wl,-soname,$(LUA_SO).$(V) -o $@.$(R) $? -lm $(MYLDFLAGS)
+	$(CC) -shared $(LIBS) -Wl,-soname,$(LUA_SO).$(V) -o $@.$(R) $? $(MYLDFLAGS)
 	ln -sf $(LUA_SO).$(R) $(LUA_SO).$(V)
 	ln -sf $(LUA_SO).$(R) $(LUA_SO)
-
diff --git a/pkgs/development/interpreters/pure/default.nix b/pkgs/development/interpreters/pure/default.nix
index 863df66899b..d1c03bba5a3 100644
--- a/pkgs/development/interpreters/pure/default.nix
+++ b/pkgs/development/interpreters/pure/default.nix
@@ -1,5 +1,5 @@
 { lib, stdenv, fetchurl, makeWrapper,
-  llvm, gmp, mpfr, readline, bison, flex }:
+  libllvm, gmp, mpfr, readline, bison, flex }:
 
 stdenv.mkDerivation rec {
   baseName="pure";
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ bison flex ];
-  propagatedBuildInputs = [ llvm gmp mpfr readline ];
+  propagatedBuildInputs = [ libllvm gmp mpfr readline ];
   NIX_LDFLAGS = "-lLLVMJIT";
 
   postPatch = ''
@@ -25,10 +25,10 @@ stdenv.mkDerivation rec {
   configureFlags = [ "--enable-release" ];
   doCheck = true;
   checkPhase = ''
-    LD_LIBRARY_PATH=$LD_LIBRARY_PATH''${LD_LIBRARY_PATH:+:}${llvm}/lib make check
+    LD_LIBRARY_PATH=$LD_LIBRARY_PATH''${LD_LIBRARY_PATH:+:}${libllvm}/lib make check
   '';
   postInstall = ''
-    wrapProgram $out/bin/pure --prefix LD_LIBRARY_PATH : ${llvm}/lib
+    wrapProgram $out/bin/pure --prefix LD_LIBRARY_PATH : ${libllvm}/lib
   '';
 
   meta = {
diff --git a/pkgs/development/interpreters/ruby/default.nix b/pkgs/development/interpreters/ruby/default.nix
index 4b185f038a1..9179866fe9e 100644
--- a/pkgs/development/interpreters/ruby/default.nix
+++ b/pkgs/development/interpreters/ruby/default.nix
@@ -12,7 +12,7 @@ let
   opString = lib.optionalString;
   patchSet = import ./rvm-patchsets.nix { inherit fetchFromGitHub; };
   config = import ./config.nix { inherit fetchFromSavannah; };
-  rubygems = import ./rubygems { inherit stdenv lib fetchurl fetchpatch; };
+  rubygems = import ./rubygems { inherit stdenv lib fetchurl; };
 
   # Contains the ruby version heuristics
   rubyVersion = import ./ruby-version.nix { inherit lib; };
@@ -55,13 +55,7 @@ let
       #   Or (usually):
       #     $(nix-build -A ruby)/lib/ruby/2.6.0/x86_64-linux/rbconfig.rb
       # - In $out/lib/libruby.so and/or $out/lib/libruby.dylib
-      #
-      # Since some Gems require JIT support, there's probably no
-      # escape from this reference. Hence, it was decided to enable this
-      # feature by default, as it's enabled by default by ruby's ./configure
-      # script. If you'd like to have a ruby without reference to cc, setting
-      # jitSupport to false should remove all known references mentioned above.
-      , removeReferencesTo, jitSupport ? true
+      , removeReferencesTo, jitSupport ? false
       , autoreconfHook, bison, autoconf
       , buildEnv, bundler, bundix
       , libiconv, libobjc, libunwind, Foundation
@@ -112,7 +106,17 @@ let
             patchLevel = ver.patchLevel;
           }).${ver.majMinTiny}
           ++ op atLeast27 ./do-not-regenerate-revision.h.patch
-          ++ op (atLeast30 && useRailsExpress) ./do-not-update-gems-baseruby.patch;
+          ++ op (atLeast30 && useRailsExpress) ./do-not-update-gems-baseruby.patch
+          # Ruby prior to 3.0 has a bug the installer (tools/rbinstall.rb) but
+          # the resulting error was swallowed. Newer rubygems no longer swallows
+          # this error. We upgrade rubygems when rubygemsSupport is enabled, so
+          # we have to fix this bug to prevent the install step from failing.
+          # See https://github.com/ruby/ruby/pull/2930
+          ++ op (!atLeast30 && rubygemsSupport)
+            (fetchpatch {
+              url = "https://github.com/ruby/ruby/commit/261d8dd20afd26feb05f00a560abd99227269c1c.patch";
+              sha256 = "0wrii25cxcz2v8bgkrf7ibcanjlxwclzhayin578bf0qydxdm9qy";
+            });
 
         postUnpack = opString rubygemsSupport ''
           rm -rf $sourceRoot/{lib,test}/rubygems*
@@ -167,8 +171,9 @@ let
         installFlags = lib.optional docSupport "install-doc";
         # Bundler tries to create this directory
         postInstall = ''
+          rbConfig=$(find $out/lib/ruby -name rbconfig.rb)
           # Remove unnecessary groff reference from runtime closure, since it's big
-          sed -i '/NROFF/d' $out/lib/ruby/*/*/rbconfig.rb
+          sed -i '/NROFF/d' $rbConfig
           ${
             lib.optionalString (!jitSupport) ''
               # Get rid of the CC runtime dependency
@@ -177,7 +182,8 @@ let
                 $out/lib/libruby*
               ${removeReferencesTo}/bin/remove-references-to \
                 -t ${stdenv.cc} \
-                $out/${passthru.libPath}/${stdenv.hostPlatform.system}/rbconfig.rb
+                $rbConfig
+              sed -i '/CC_VERSION_MESSAGE/d' $rbConfig
             ''
           }
           # Bundler tries to create this directory
@@ -195,8 +201,6 @@ let
           addEnvHooks "$hostOffset" addGemPath
           addEnvHooks "$hostOffset" addRubyLibPath
           EOF
-
-          rbConfig=$(find $out/lib/ruby -name rbconfig.rb)
         '' + opString docSupport ''
           # Prevent the docs from being included in the closure
           sed -i "s|\$(DESTDIR)$devdoc|\$(datarootdir)/\$(RI_BASE_NAME)|" $rbConfig
diff --git a/pkgs/development/interpreters/ruby/rubygems/default.nix b/pkgs/development/interpreters/ruby/rubygems/default.nix
index 19eed817ec2..db508caae31 100644
--- a/pkgs/development/interpreters/ruby/rubygems/default.nix
+++ b/pkgs/development/interpreters/ruby/rubygems/default.nix
@@ -1,23 +1,18 @@
-{ stdenv, lib, fetchurl, fetchpatch }:
+{ stdenv, lib, fetchurl }:
 
 stdenv.mkDerivation rec {
   name = "rubygems";
-  version = "3.1.3";
+  version = "3.2.16";
 
   src = fetchurl {
     url = "https://rubygems.org/rubygems/rubygems-${version}.tgz";
-    sha256 = "181wjclxnq5lrwnr53famy9pg8911hi9w2v0vy7dqgjqnc4iy1hp";
+    sha256 = "1bpn45hchcbirqvqwxcxyk1xy2xkdd915jci2hfjq4y6zc4idns0";
   };
 
   patches = [
     ./0001-add-post-extract-hook.patch
     ./0002-binaries-with-env-shebang.patch
     ./0003-gem-install-default-to-user.patch
-
-    (fetchpatch {
-      url = "https://github.com/rubygems/rubygems/commit/0af4d2d369ff580ef54839ec15a8c7ec419978cb.patch";
-      sha256 = "13gyfxn4rmxq1dbxq5rzphnhagn8n8kpp8lb9h6h4s9d4zaklax9";
-    })
   ];
 
   installPhase = ''
diff --git a/pkgs/development/interpreters/spidermonkey/68.nix b/pkgs/development/interpreters/spidermonkey/68.nix
index 0ac005b07de..f867e606140 100644
--- a/pkgs/development/interpreters/spidermonkey/68.nix
+++ b/pkgs/development/interpreters/spidermonkey/68.nix
@@ -55,7 +55,7 @@ in stdenv.mkDerivation rec {
     "--with-system-zlib"
     "--with-system-icu"
 
-    "--with-libclang-path=${llvmPackages.libclang}/lib"
+    "--with-libclang-path=${llvmPackages.libclang.lib}/lib"
     "--with-clang-path=${llvmPackages.clang}/bin/clang"
 
     "--enable-shared-js"
diff --git a/pkgs/development/interpreters/wasmer/default.nix b/pkgs/development/interpreters/wasmer/default.nix
index 8077177d8b8..eb17fda0830 100644
--- a/pkgs/development/interpreters/wasmer/default.nix
+++ b/pkgs/development/interpreters/wasmer/default.nix
@@ -35,7 +35,7 @@ rustPlatform.buildRustPackage rec {
     "--features" "test-cranelift,test-jit"
   ];
 
-  LIBCLANG_PATH = "${llvmPackages.libclang}/lib";
+  LIBCLANG_PATH = "${llvmPackages.libclang.lib}/lib";
 
   meta = with lib; {
     description = "The Universal WebAssembly Runtime";
diff --git a/pkgs/development/interpreters/wasmtime/default.nix b/pkgs/development/interpreters/wasmtime/default.nix
index 3d13dddb642..9afca8f1f71 100644
--- a/pkgs/development/interpreters/wasmtime/default.nix
+++ b/pkgs/development/interpreters/wasmtime/default.nix
@@ -17,7 +17,7 @@ rustPlatform.buildRustPackage rec {
   nativeBuildInputs = [ python cmake clang ];
   buildInputs = [ llvmPackages.libclang ] ++
    lib.optionals stdenv.isDarwin [ darwin.apple_sdk.frameworks.Security ];
-  LIBCLANG_PATH = "${llvmPackages.libclang}/lib";
+  LIBCLANG_PATH = "${llvmPackages.libclang.lib}/lib";
 
   doCheck = true;
 
diff --git a/pkgs/development/libraries/SDL2_image/default.nix b/pkgs/development/libraries/SDL2_image/default.nix
index 96f85ddb0ea..a0f770178cc 100644
--- a/pkgs/development/libraries/SDL2_image/default.nix
+++ b/pkgs/development/libraries/SDL2_image/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, SDL2, libpng, libjpeg, libtiff, libungif, libwebp, libXpm, zlib, Foundation }:
+{ lib, stdenv, fetchurl, SDL2, libpng, libjpeg, libtiff, giflib, libwebp, libXpm, zlib, Foundation }:
 
 stdenv.mkDerivation rec {
   pname = "SDL2_image";
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
     sha256 = "1l0864kas9cwpp2d32yxl81g98lx40dhbdp03dz7sbv84vhgdmdx";
   };
 
-  buildInputs = [ SDL2 libpng libjpeg libtiff libungif libwebp libXpm zlib ]
+  buildInputs = [ SDL2 libpng libjpeg libtiff giflib libwebp libXpm zlib ]
     ++ lib.optional stdenv.isDarwin Foundation;
 
 
diff --git a/pkgs/development/libraries/SDL_image/default.nix b/pkgs/development/libraries/SDL_image/default.nix
index 2e5841b3f48..fe97f016743 100644
--- a/pkgs/development/libraries/SDL_image/default.nix
+++ b/pkgs/development/libraries/SDL_image/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, fetchpatch, SDL, libpng, libjpeg, libtiff, libungif, libXpm }:
+{ lib, stdenv, fetchurl, fetchpatch, SDL, libpng, libjpeg, libtiff, giflib, libXpm }:
 
 stdenv.mkDerivation rec {
   pname = "SDL_image";
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
     "--disable-tif-shared"
   ] ++ lib.optional stdenv.isDarwin "--disable-sdltest";
 
-  buildInputs = [ SDL libpng libjpeg libtiff libungif libXpm ];
+  buildInputs = [ SDL libpng libjpeg libtiff giflib libXpm ];
 
   meta = with lib; {
     description = "SDL image library";
diff --git a/pkgs/development/libraries/bctoolbox/default.nix b/pkgs/development/libraries/bctoolbox/default.nix
index 1d8f35cd01c..c482b55c60b 100644
--- a/pkgs/development/libraries/bctoolbox/default.nix
+++ b/pkgs/development/libraries/bctoolbox/default.nix
@@ -7,7 +7,7 @@
 
 stdenv.mkDerivation rec {
   pname = "bctoolbox";
-  version = "4.5.7";
+  version = "4.5.15";
 
   nativeBuildInputs = [ cmake bcunit ];
   buildInputs = [ mbedtls ];
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
     group = "BC";
     repo = pname;
     rev = version;
-    sha256 = "sha256-JQ2HgFVqgO+LLXmN95ZTHyT+htCFUC3VRreKLwPYo9Y=";
+    sha256 = "sha256-yN9dfeJBuUxXfG7zDoawn2nKGsrhetBcXpGDmcekU20=";
   };
 
   # Do not build static libraries
diff --git a/pkgs/development/libraries/beignet/default.nix b/pkgs/development/libraries/beignet/default.nix
index 8e8e455e59a..3d88c93784a 100644
--- a/pkgs/development/libraries/beignet/default.nix
+++ b/pkgs/development/libraries/beignet/default.nix
@@ -2,8 +2,8 @@
 , fetchFromGitHub
 , cmake
 , pkg-config
-, clang-unwrapped
-, llvm
+, libclang
+, libllvm
 , libdrm
 , libX11
 , libpthreadstubs
@@ -35,11 +35,11 @@ stdenv.mkDerivation rec {
     patchShebangs src/git_sha1.sh
   '';
 
-  cmakeFlags = [ "-DCLANG_LIBRARY_DIR=${clang-unwrapped}/lib" ];
+  cmakeFlags = [ "-DCLANG_LIBRARY_DIR=${libclang.lib}/lib" ];
 
   buildInputs = [
-    llvm
-    clang-unwrapped
+    libllvm
+    libclang
     libX11
     libXext
     libpthreadstubs
diff --git a/pkgs/development/libraries/ffmpeg-full/default.nix b/pkgs/development/libraries/ffmpeg-full/default.nix
index d861d25e67a..e9c9f2fdf6a 100644
--- a/pkgs/development/libraries/ffmpeg-full/default.nix
+++ b/pkgs/development/libraries/ffmpeg-full/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, ffmpeg, addOpenGLRunpath, fetchurl, fetchpatch, pkg-config, perl, texinfo, yasm
+{ lib, stdenv, ffmpeg, addOpenGLRunpath, pkg-config, perl, texinfo, yasm
 /*
  *  Licensing options (yes some are listed twice, filters and such are not listed)
  */
@@ -126,13 +126,14 @@
 , vid-stab ? null # Video stabilization
 #, vo-aacenc ? null # AAC encoder
 , vo-amrwbenc ? null # AMR-WB encoder
-, wavpack ? null # Wavpack encoder
 , x264 ? null # H.264/AVC encoder
 , x265 ? null # H.265/HEVC encoder
 , xavs ? null # AVS encoder
 , xvidcore ? null # Xvid encoder, native encoder exists
 , zeromq4 ? null # Message passing
 , zlib ? null
+, vulkan-loader ? null
+, glslang ? null
 #, zvbi ? null # Teletext support
 /*
  *  Developer options
@@ -244,15 +245,6 @@ stdenv.mkDerivation rec {
   pname = "ffmpeg-full";
   inherit (ffmpeg) src version;
 
-  # this should go away in the next release
-  patches = [
-    # Patch ffmpeg for svt-av1 until version 4.4
-    (fetchpatch {
-      url = "https://raw.githubusercontent.com/AOMediaCodec/SVT-AV1/v0.8.4/ffmpeg_plugin/0001-Add-ability-for-ffmpeg-to-run-svt-av1.patch";
-      sha256 = "1p4g8skr5gjw5h1648j7qrks81zx49lrnx9g0p81qgnrvxc2wwx0";
-    })
-  ];
-
   prePatch = ''
     patchShebangs .
   '' + lib.optionalString stdenv.isDarwin ''
@@ -405,13 +397,14 @@ stdenv.mkDerivation rec {
     (enableFeature (vid-stab != null && gplLicensing) "libvidstab") # Actual min. version 2.0
     #(enableFeature (vo-aacenc != null && version3Licensing) "libvo-aacenc")
     (enableFeature (vo-amrwbenc != null && version3Licensing) "libvo-amrwbenc")
-    (enableFeature (wavpack != null) "libwavpack")
     (enableFeature (x264 != null && gplLicensing) "libx264")
     (enableFeature (x265 != null && gplLicensing) "libx265")
     (enableFeature (xavs != null && gplLicensing) "libxavs")
     (enableFeature (xvidcore != null && gplLicensing) "libxvid")
     (enableFeature (zeromq4 != null) "libzmq")
     (enableFeature (zlib != null) "zlib")
+    (enableFeature (isLinux && vulkan-loader != null) "vulkan")
+    (enableFeature (glslang != null) "libglslang")
     #(enableFeature (zvbi != null && gplLicensing) "libzvbi")
     /*
      * Developer flags
@@ -432,13 +425,13 @@ stdenv.mkDerivation rec {
     libjack2 ladspaH lame libaom libass libbluray libbs2b libcaca libdc1394 libmodplug libmysofa
     libogg libopus librsvg libssh libtheora libvdpau libvorbis libvpx libwebp libX11
     libxcb libXv libXext xz openal openjpeg libpulseaudio rav1e svt-av1 rtmpdump opencore-amr
-    samba SDL2 soxr speex srt vid-stab vo-amrwbenc wavpack x264 x265 xavs xvidcore
-    zeromq4 zlib
+    samba SDL2 soxr speex srt vid-stab vo-amrwbenc x264 x265 xavs xvidcore
+    zeromq4 zlib glslang
   ] ++ optionals openglExtlib [ libGL libGLU ]
     ++ optionals nonfreeLicensing [ fdk_aac openssl ]
     ++ optional ((isLinux || isFreeBSD) && libva != null) libva
     ++ optional (!isAarch64 && libvmaf != null && version3Licensing) libvmaf
-    ++ optionals isLinux [ alsaLib libraw1394 libv4l ]
+    ++ optionals isLinux [ alsaLib libraw1394 libv4l vulkan-loader ]
     ++ optional (isLinux && !isAarch64 && libmfx != null) libmfx
     ++ optional nvenc nv-codec-headers
     ++ optionals stdenv.isDarwin [ Cocoa CoreServices CoreAudio AVFoundation
@@ -465,6 +458,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "A complete, cross-platform solution to record, convert and stream audio and video";
     homepage = "https://www.ffmpeg.org/";
+    changelog = "https://github.com/FFmpeg/FFmpeg/blob/n${version}/Changelog";
     longDescription = ''
       FFmpeg is the leading multimedia framework, able to decode, encode, transcode,
       mux, demux, stream, filter and play pretty much anything that humans and machines
diff --git a/pkgs/development/libraries/ffmpeg/3.4.nix b/pkgs/development/libraries/ffmpeg/3.4.nix
index be341d588c1..a5140fa01ca 100644
--- a/pkgs/development/libraries/ffmpeg/3.4.nix
+++ b/pkgs/development/libraries/ffmpeg/3.4.nix
@@ -1,4 +1,4 @@
-{ callPackage, fetchpatch
+{ callPackage
 # Darwin frameworks
 , Cocoa, CoreMedia
 , ...
diff --git a/pkgs/development/libraries/ffmpeg/4.nix b/pkgs/development/libraries/ffmpeg/4.nix
index 95207b5386f..df3d0732393 100644
--- a/pkgs/development/libraries/ffmpeg/4.nix
+++ b/pkgs/development/libraries/ffmpeg/4.nix
@@ -1,12 +1,17 @@
-{ callPackage, fetchpatch
+{ callPackage
 # Darwin frameworks
 , Cocoa, CoreMedia, VideoToolbox
+, stdenv, lib
 , ...
 }@args:
 
 callPackage ./generic.nix (rec {
-  version = "4.3.2";
-  branch = "4.3";
-  sha256 = "0flik4y7c5kchj65p3p908mk1dsncqgzjdvzysjs12rmf1m6sfmb";
+  version = "4.4";
+  branch = "4.4";
+  sha256 = "03kxc29y8190k4y8s8qdpsghlbpmchv1m8iqygq2qn0vfm4ka2a2";
   darwinFrameworks = [ Cocoa CoreMedia VideoToolbox ];
+
+  /* Work around https://trac.ffmpeg.org/ticket/9242 */
+  patches = lib.optional stdenv.isDarwin
+    ./v2-0001-avcodec-videotoolboxenc-define-TARGET_CPU_ARM64-t.patch;
 } // args)
diff --git a/pkgs/development/libraries/ffmpeg/generic.nix b/pkgs/development/libraries/ffmpeg/generic.nix
index ca77e425904..7e4a6a08098 100644
--- a/pkgs/development/libraries/ffmpeg/generic.nix
+++ b/pkgs/development/libraries/ffmpeg/generic.nix
@@ -213,7 +213,8 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "A complete, cross-platform solution to record, convert and stream audio and video";
-    homepage = "http://www.ffmpeg.org/";
+    homepage = "https://www.ffmpeg.org/";
+    changelog = "https://github.com/FFmpeg/FFmpeg/blob/n${version}/Changelog";
     longDescription = ''
       FFmpeg is the leading multimedia framework, able to decode, encode, transcode,
       mux, demux, stream, filter and play pretty much anything that humans and machines
diff --git a/pkgs/development/libraries/ffmpeg/v2-0001-avcodec-videotoolboxenc-define-TARGET_CPU_ARM64-t.patch b/pkgs/development/libraries/ffmpeg/v2-0001-avcodec-videotoolboxenc-define-TARGET_CPU_ARM64-t.patch
new file mode 100644
index 00000000000..c0c2c1fb23b
--- /dev/null
+++ b/pkgs/development/libraries/ffmpeg/v2-0001-avcodec-videotoolboxenc-define-TARGET_CPU_ARM64-t.patch
@@ -0,0 +1,35 @@
+From 5b562aaddbc6e7a94a079c2e88230b205a7f4d73 Mon Sep 17 00:00:00 2001
+From: Zane van Iperen <zane@zanevaniperen.com>
+Date: Sat, 15 May 2021 19:33:52 +1000
+Subject: [PATCH v2] avcodec/videotoolboxenc: #define TARGET_CPU_ARM64 to 0 if
+ not provided by the SDK
+
+Fixes build failure on older SDKs without it.
+
+Fixes #9242
+
+Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
+---
+ libavcodec/videotoolboxenc.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+NB: This is untested, I do not have a Mac to try it on.
+
+diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
+index 58239e0ab9..f063a86e73 100644
+--- a/libavcodec/videotoolboxenc.c
++++ b/libavcodec/videotoolboxenc.c
+@@ -50,6 +50,10 @@ enum { kCVPixelFormatType_420YpCbCr10BiPlanarFullRange = 'xf20' };
+ enum { kCVPixelFormatType_420YpCbCr10BiPlanarVideoRange = 'x420' };
+ #endif
+ 
++#ifndef TARGET_CPU_ARM64
++#   define TARGET_CPU_ARM64 0
++#endif
++
+ typedef OSStatus (*getParameterSetAtIndex)(CMFormatDescriptionRef videoDesc,
+                                            size_t parameterSetIndex,
+                                            const uint8_t **parameterSetPointerOut,
+-- 
+2.29.3
+
diff --git a/pkgs/development/libraries/giflib/libungif.nix b/pkgs/development/libraries/giflib/libungif.nix
deleted file mode 100644
index d8c32d14fca..00000000000
--- a/pkgs/development/libraries/giflib/libungif.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-{lib, stdenv, fetchurl}:
-
-stdenv.mkDerivation {
-  name = "libungif-4.1.4";
-  src = fetchurl {
-    url = "mirror://sourceforge/giflib/libungif-4.1.4.tar.gz";
-    sha256 = "5e65e1e5deacd0cde489900dbf54c6c2ee2ebc818199e720dbad685d87abda3d";
-  };
-
-  hardeningDisable = [ "format" ];
-
-  meta = with lib; {
-    description = "Library and utilities for processing GIFs";
-    platforms = platforms.unix;
-    license = licenses.mit;
-  };
-}
diff --git a/pkgs/development/libraries/glib/default.nix b/pkgs/development/libraries/glib/default.nix
index 170cddf3100..08f7c9a4c78 100644
--- a/pkgs/development/libraries/glib/default.nix
+++ b/pkgs/development/libraries/glib/default.nix
@@ -92,13 +92,23 @@ stdenv.mkDerivation rec {
   buildInputs = [
     libelf setupHook pcre
     bash gnum4 # install glib-gettextize and m4 macros for other apps to use
-    gtk-doc
   ] ++ optionals stdenv.isLinux [
     libselinux
     util-linuxMinimal # for libmount
   ] ++ optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
     AppKit Carbon Cocoa CoreFoundation CoreServices Foundation
-  ]);
+  ]) ++ optionals (stdenv.hostPlatform == stdenv.buildPlatform) [
+    # Note: this needs to be both in buildInputs and nativeBuildInputs. The
+    # Meson gtkdoc module uses find_program to look it up (-> build dep), but
+    # glib's own Meson configuration uses the host pkg-config to find its
+    # version (-> host dep). We could technically go and fix this in glib, add
+    # pkg-config to depsBuildBuild, but this would be a futile exercise since
+    # Meson's gtkdoc integration does not support cross compilation[1] anyway
+    # and this derivation disables the docs build when cross compiling.
+    #
+    # [1] https://github.com/mesonbuild/meson/issues/2003
+    gtk-doc
+  ];
 
   strictDeps = true;
 
diff --git a/pkgs/development/libraries/glibc/2.32-master.patch.gz b/pkgs/development/libraries/glibc/2.32-master.patch.gz
index bcf4d13443c..2fda4294130 100644
--- a/pkgs/development/libraries/glibc/2.32-master.patch.gz
+++ b/pkgs/development/libraries/glibc/2.32-master.patch.gz
Binary files differdiff --git a/pkgs/development/libraries/glibc/common.nix b/pkgs/development/libraries/glibc/common.nix
index 7a83ffd36d7..0108214a56e 100644
--- a/pkgs/development/libraries/glibc/common.nix
+++ b/pkgs/development/libraries/glibc/common.nix
@@ -42,7 +42,7 @@
 
 let
   version = "2.32";
-  patchSuffix = "-40";
+  patchSuffix = "-46";
   sha256 = "0di848ibffrnwq7g2dvgqrnn4xqhj3h96csn69q4da51ymafl9qn";
 in
 
@@ -61,7 +61,7 @@ stdenv.mkDerivation ({
     [
       /* No tarballs for stable upstream branch, only https://sourceware.org/git/glibc.git and using git would complicate bootstrapping.
           $ git fetch --all -p && git checkout origin/release/2.32/master && git describe
-          glibc-2.32-40-g778b8d3786
+          glibc-2.32-46-g1799ac8eab
           $ git show --minimal --reverse glibc-2.32.. | gzip -9n --rsyncable - > 2.32-master.patch.gz
 
          To compare the archive contents zdiff can be used.
diff --git a/pkgs/development/libraries/gstreamer/base/default.nix b/pkgs/development/libraries/gstreamer/base/default.nix
index 4f392622065..7e9095ef0ed 100644
--- a/pkgs/development/libraries/gstreamer/base/default.nix
+++ b/pkgs/development/libraries/gstreamer/base/default.nix
@@ -41,13 +41,13 @@
 
 stdenv.mkDerivation rec {
   pname = "gst-plugins-base";
-  version = "1.18.2";
+  version = "1.18.4";
 
   outputs = [ "out" "dev" ];
 
   src = fetchurl {
     url = "https://gstreamer.freedesktop.org/src/${pname}/${pname}-${version}.tar.xz";
-    sha256 = "1b05kg46azrxxvq42c71071lfsnc34pw4vynnkczdqi6g0gzn16x";
+    sha256 = "08w3ivbc6n4vdds2ap6q7l8zdk9if8417nznyqidf0adm0lk5r99";
   };
 
   patches = [
diff --git a/pkgs/development/libraries/gstreamer/core/default.nix b/pkgs/development/libraries/gstreamer/core/default.nix
index 84badf30410..2d43a02725f 100644
--- a/pkgs/development/libraries/gstreamer/core/default.nix
+++ b/pkgs/development/libraries/gstreamer/core/default.nix
@@ -21,7 +21,7 @@
 
 stdenv.mkDerivation rec {
   pname = "gstreamer";
-  version = "1.18.2";
+  version = "1.18.4";
 
   outputs = [
     "out"
@@ -34,7 +34,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "https://gstreamer.freedesktop.org/src/${pname}/${pname}-${version}.tar.xz";
-    sha256 = "0ijlmvr660m8zn09xlmnq1ajrziqsivp2hig5a9mabhcjx7ypkb6";
+    sha256 = "1igv9l4hm21kp1jmlwlagzs7ly1vaxv1sbda29q8247372dwkvls";
   };
 
   patches = [
diff --git a/pkgs/development/libraries/gstreamer/devtools/default.nix b/pkgs/development/libraries/gstreamer/devtools/default.nix
index a39eadafb0b..517fe9b302d 100644
--- a/pkgs/development/libraries/gstreamer/devtools/default.nix
+++ b/pkgs/development/libraries/gstreamer/devtools/default.nix
@@ -12,11 +12,11 @@
 
 stdenv.mkDerivation rec {
   pname = "gst-devtools";
-  version = "1.18.2";
+  version = "1.18.4";
 
   src = fetchurl {
     url = "https://gstreamer.freedesktop.org/src/${pname}/${pname}-${version}.tar.xz";
-    sha256 = "0mhascwvgirgh7b5dykpnk06f7f5g62gh3sl30i6kygiidqkv9vf";
+    sha256 = "1kvcabcfzm7wqih3lzgrg9xjbn4xpx43d1m2zkkvab4i8161kggz";
   };
 
   patches = [
diff --git a/pkgs/development/libraries/gstreamer/ges/default.nix b/pkgs/development/libraries/gstreamer/ges/default.nix
index 774fefbc358..6ada053ea01 100644
--- a/pkgs/development/libraries/gstreamer/ges/default.nix
+++ b/pkgs/development/libraries/gstreamer/ges/default.nix
@@ -16,7 +16,7 @@
 
 stdenv.mkDerivation rec {
   pname = "gst-editing-services";
-  version = "1.18.2";
+  version = "1.18.4";
 
   outputs = [
     "out"
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "https://gstreamer.freedesktop.org/src/${pname}/${pname}-${version}.tar.xz";
-    sha256 = "0pv2k8zlpn3vv2sdlspi3m63ixcwzi90pjly2ypbkg59ab97rb15";
+    sha256 = "010xg960qsh5dwmf0y9l1q13h0cymmrgapzla2zsw66ylxqbi1s6";
   };
 
   patches = [
diff --git a/pkgs/development/libraries/gstreamer/good/default.nix b/pkgs/development/libraries/gstreamer/good/default.nix
index b08759b8dba..86684893efd 100644
--- a/pkgs/development/libraries/gstreamer/good/default.nix
+++ b/pkgs/development/libraries/gstreamer/good/default.nix
@@ -48,13 +48,13 @@ assert raspiCameraSupport -> (stdenv.isLinux && stdenv.isAarch64);
 
 stdenv.mkDerivation rec {
   pname = "gst-plugins-good";
-  version = "1.18.2";
+  version = "1.18.4";
 
   outputs = [ "out" "dev" ];
 
   src = fetchurl {
     url = "https://gstreamer.freedesktop.org/src/${pname}/${pname}-${version}.tar.xz";
-    sha256 = "1929nhjsvbl4bw37nfagnfsnxz737cm2x3ayz9ayrn9lwkfm45zp";
+    sha256 = "1c1rpq709cy8maaykyn1n0kckj9c6fl3mhvixkk6xmdwkcx0xrdn";
   };
 
   nativeBuildInputs = [
diff --git a/pkgs/development/libraries/gstreamer/libav/default.nix b/pkgs/development/libraries/gstreamer/libav/default.nix
index f0755f201d4..009a1555f77 100644
--- a/pkgs/development/libraries/gstreamer/libav/default.nix
+++ b/pkgs/development/libraries/gstreamer/libav/default.nix
@@ -15,11 +15,11 @@
 
 stdenv.mkDerivation rec {
   pname = "gst-libav";
-  version = "1.18.2";
+  version = "1.18.4";
 
   src = fetchurl {
     url = "https://gstreamer.freedesktop.org/src/${pname}/${pname}-${version}.tar.xz";
-    sha256 = "0jbzams9ggk3sq9ywv4gsl9rghyn203l2582m6l5c1sz9ka9m5in";
+    sha256 = "15n3x3vhshqa3icw93g4vqmqd46122anzqvfxwn6q8famlxlcjil";
   };
 
   outputs = [ "out" "dev" ];
diff --git a/pkgs/development/libraries/gstreamer/rtsp-server/default.nix b/pkgs/development/libraries/gstreamer/rtsp-server/default.nix
index 037face3d12..56596960019 100644
--- a/pkgs/development/libraries/gstreamer/rtsp-server/default.nix
+++ b/pkgs/development/libraries/gstreamer/rtsp-server/default.nix
@@ -12,11 +12,11 @@
 
 stdenv.mkDerivation rec {
   pname = "gst-rtsp-server";
-  version = "1.18.2";
+  version = "1.18.4";
 
   src = fetchurl {
     url = "https://gstreamer.freedesktop.org/src/${pname}/${pname}-${version}.tar.xz";
-    sha256 = "1qjlp7az0hkzxvq53hwnp55sp6xhbybfwzaj66hp45jslsmj4fcp";
+    sha256 = "153c78klvzlmi86d0gmdf7w9crv11rkd4y82b14a0wdr83gbhsx4";
   };
 
   outputs = [
diff --git a/pkgs/development/libraries/gstreamer/ugly/default.nix b/pkgs/development/libraries/gstreamer/ugly/default.nix
index 7c70b7ead1a..049e8a99f09 100644
--- a/pkgs/development/libraries/gstreamer/ugly/default.nix
+++ b/pkgs/development/libraries/gstreamer/ugly/default.nix
@@ -23,13 +23,13 @@
 
 stdenv.mkDerivation rec {
   pname = "gst-plugins-ugly";
-  version = "1.18.2";
+  version = "1.18.4";
 
   outputs = [ "out" "dev" ];
 
   src = fetchurl {
     url = "https://gstreamer.freedesktop.org/src/${pname}/${pname}-${version}.tar.xz";
-    sha256 = "1nwbcv5yaib3d8icvyja3zf6lyjf5zf1hndbijrhj8j7xlia0dx3";
+    sha256 = "0g6i4db1883q3j0l2gdv46fcqwiiaw63n6mhvsfcms1i1p7g1391";
   };
 
   nativeBuildInputs = [
diff --git a/pkgs/development/libraries/gstreamer/vaapi/default.nix b/pkgs/development/libraries/gstreamer/vaapi/default.nix
index 2c92cd2236f..19e65c5a75e 100644
--- a/pkgs/development/libraries/gstreamer/vaapi/default.nix
+++ b/pkgs/development/libraries/gstreamer/vaapi/default.nix
@@ -21,11 +21,11 @@
 
 stdenv.mkDerivation rec {
   pname = "gstreamer-vaapi";
-  version = "1.18.2";
+  version = "1.18.4";
 
   src = fetchurl {
     url = "https://gstreamer.freedesktop.org/src/${pname}/${pname}-${version}.tar.xz";
-    sha256 = "1h67n7wk1297rzynknbyv44gdacblvkcvb37x8yxi5d0zms2qywc";
+    sha256 = "1sia4l88z7kkxm2z9j20l43rqkrnsa47xccski10s5gkhsprinwj";
   };
 
   outputs = [
diff --git a/pkgs/development/libraries/hunspell/dictionaries.nix b/pkgs/development/libraries/hunspell/dictionaries.nix
index 37b56789635..f1bcd4ad00c 100644
--- a/pkgs/development/libraries/hunspell/dictionaries.nix
+++ b/pkgs/development/libraries/hunspell/dictionaries.nix
@@ -761,11 +761,11 @@ in rec {
   da_DK = da-dk;
   da-dk = mkDict rec {
     name = "hunspell-dict-da-dk-${version}";
-    version = "2.5.137";
+    version = "2.5.189";
 
     src = fetchurl {
       url = "https://stavekontrolden.dk/dictionaries/da_DK/da_DK-${version}.oxt";
-      sha256 = "16y0smkg1mq0133r1fbw5ak6s2xw39281knk5ivhanakayq789qx";
+      sha256 = "sha256:0i1cw0nfg24b0sg2yc3q7315ng5vc5245nvh0l1cndkn2c9z4978";
     };
 
     shortName = "da-dk";
diff --git a/pkgs/development/libraries/icu/69.nix b/pkgs/development/libraries/icu/69.nix
new file mode 100644
index 00000000000..8cea41daadb
--- /dev/null
+++ b/pkgs/development/libraries/icu/69.nix
@@ -0,0 +1,4 @@
+import ./base.nix {
+  version = "69.1";
+  sha256 = "0icps0avkwy5df3wwc5kybxcg63hcgk4phdh9g244g0xrmx7pfjc";
+}
diff --git a/pkgs/development/libraries/imlib/default.nix b/pkgs/development/libraries/imlib/default.nix
index 53612f8205f..1d6fed2281e 100644
--- a/pkgs/development/libraries/imlib/default.nix
+++ b/pkgs/development/libraries/imlib/default.nix
@@ -1,4 +1,6 @@
-{lib, stdenv, fetchurl, fetchpatch, libX11, libXext, xorgproto, libjpeg, libungif, libtiff, libpng}:
+{ lib, stdenv, fetchurl, fetchpatch
+, libX11, libXext, xorgproto, libjpeg, giflib, libtiff, libpng
+}:
 
 stdenv.mkDerivation {
   name = "imlib-1.9.15";
@@ -13,6 +15,16 @@ stdenv.mkDerivation {
       url = "https://gitweb.gentoo.org/repo/gentoo.git/plain/media-libs/imlib/files/imlib-1.9.15-bpp16-CVE-2007-3568.patch";
       sha256 = "0lxfibi094gki39sq1w4p0hcx25xlk0875agbhjkjngzx862wvbg";
     })
+
+    # The following two patches fix the build with recent giflib.
+    (fetchpatch {
+      url = "https://gitweb.gentoo.org/repo/gentoo.git/plain/media-libs/imlib/files/imlib-1.9.15-giflib51-1.patch?id=c6d0ed89ad5653421f21cbf3b3d40fd9a1361828";
+      sha256 = "0jynlhxcyjiwnz1m8j48xwz4z5csgyg03jfjc8xgpvvcyid4m65l";
+    })
+    (fetchpatch {
+      url = "https://gitweb.gentoo.org/repo/gentoo.git/plain/media-libs/imlib/files/imlib-1.9.15-giflib51-2.patch?id=c6d0ed89ad5653421f21cbf3b3d40fd9a1361828";
+      sha256 = "164x7rd992930rqllmr89p5ahfmbz37ipi8x0igd8gkvc8a4fd5x";
+    })
   ];
 
   configureFlags = [
@@ -21,11 +33,11 @@ stdenv.mkDerivation {
     "--x-libraries=${libX11.out}/lib"
   ];
 
-  buildInputs = [libjpeg libXext libX11 xorgproto libtiff libungif libpng];
+  buildInputs = [ libjpeg libXext libX11 xorgproto libtiff giflib libpng ];
 
   meta = with lib; {
     description = "An image loading and rendering library for X11";
     platforms = platforms.unix;
-    license = with licenses; [ gpl2 lgpl2 ];
+    license = with licenses; [ gpl2Only lgpl2Only ];
   };
 }
diff --git a/pkgs/development/libraries/json-glib/default.nix b/pkgs/development/libraries/json-glib/default.nix
index afbb7aaed96..9ef66fd2ce6 100644
--- a/pkgs/development/libraries/json-glib/default.nix
+++ b/pkgs/development/libraries/json-glib/default.nix
@@ -6,6 +6,7 @@
 , ninja
 , pkg-config
 , gettext
+, withIntrospection ? stdenv.buildPlatform == stdenv.hostPlatform
 , gobject-introspection
 , fixDarwinDylibNames
 , gtk-doc
@@ -18,31 +19,45 @@ stdenv.mkDerivation rec {
   pname = "json-glib";
   version = "1.6.2";
 
-  outputs = [ "out" "dev" "devdoc" ];
+  outputs = [ "out" "dev" ]
+    ++ lib.optional withIntrospection "devdoc";
 
   src = fetchurl {
     url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
     sha256 = "092g2dyy1hhl0ix9kp33wcab0pg1qicnsv0cj5ms9g9qs336cgd3";
   };
 
+  strictDeps = true;
+
+  depsBuildBuild = [
+    pkg-config
+  ];
+
   nativeBuildInputs = [
     meson
     ninja
     pkg-config
     gettext
-    gobject-introspection
     glib
-    gtk-doc
     docbook-xsl-nons
     docbook_xml_dtd_43
   ] ++ lib.optional stdenv.hostPlatform.isDarwin [
     fixDarwinDylibNames
+  ] ++ lib.optionals withIntrospection [
+    gobject-introspection
+    gtk-doc
   ];
 
   propagatedBuildInputs = [
     glib
   ];
 
+  mesonFlags = lib.optionals (!withIntrospection) [
+    "-Dintrospection=disabled"
+    # doc gen uses introspection, doesn't work properly
+    "-Dgtk_doc=disabled"
+  ];
+
   doCheck = true;
 
   passthru = {
diff --git a/pkgs/development/libraries/libaom/default.nix b/pkgs/development/libraries/libaom/default.nix
index 62045a79ebf..83f5de4d013 100644
--- a/pkgs/development/libraries/libaom/default.nix
+++ b/pkgs/development/libraries/libaom/default.nix
@@ -1,13 +1,13 @@
-{ lib, stdenv, fetchgit, yasm, perl, cmake, pkg-config, python3 }:
+{ lib, stdenv, fetchzip, yasm, perl, cmake, pkg-config, python3 }:
 
 stdenv.mkDerivation rec {
   pname = "libaom";
-  version = "3.0.0";
+  version = "3.1.0";
 
-  src = fetchgit {
-    url = "https://aomedia.googlesource.com/aom";
-    rev	= "v${version}";
-    sha256 = "178rq1d7i9q4lg40bipkyhdrk18j9wi5k5avpa5bls0zm7g5ifsx";
+  src = fetchzip {
+    url = "https://aomedia.googlesource.com/aom/+archive/v${version}.tar.gz";
+    sha256 = "1v3i34jmbz1p3x8msj3vx46nl6jdzxbkr2lfbh06vard8adb16il";
+    stripRoot = false;
   };
 
   patches = [ ./outputs.patch ];
diff --git a/pkgs/development/libraries/libass/default.nix b/pkgs/development/libraries/libass/default.nix
index 6a180cb62c1..3a8c2a2655a 100644
--- a/pkgs/development/libraries/libass/default.nix
+++ b/pkgs/development/libraries/libass/default.nix
@@ -17,11 +17,11 @@ in
 with lib;
 stdenv.mkDerivation rec {
   pname = "libass";
-  version = "0.15.0";
+  version = "0.15.1";
 
   src = fetchurl {
     url = "https://github.com/libass/libass/releases/download/${version}/${pname}-${version}.tar.xz";
-    sha256 = "0cz8v6kh3f2j5rdjrra2z0h715fa16vjm7kambvqx9hak86262cz";
+    sha256 = "sha256-HN05ydAHsG5zfnc4AE1/OM+bHpKEPzcweyTn/2OrjlM=";
   };
 
   configureFlags = [
diff --git a/pkgs/development/libraries/libfido2/default.nix b/pkgs/development/libraries/libfido2/default.nix
index f44ae4d01f2..64c16e92c44 100644
--- a/pkgs/development/libraries/libfido2/default.nix
+++ b/pkgs/development/libraries/libfido2/default.nix
@@ -1,4 +1,5 @@
-{ lib, stdenv
+{ lib
+, stdenv
 , fetchurl
 , fetchpatch
 , cmake
@@ -7,30 +8,47 @@
 , libcbor
 , openssl
 , udev
+, zlib
 }:
 
 stdenv.mkDerivation rec {
   pname = "libfido2";
-  version = "1.5.0";
+  version = "1.7.0";
+
+  # releases on https://developers.yubico.com/libfido2/Releases/ are signed
   src = fetchurl {
     url = "https://developers.yubico.com/${pname}/Releases/${pname}-${version}.tar.gz";
-    sha256 = "08iizxq3w8mpkwfrfpl59csffc20yz8x398bl3kf23rrr4izk42r";
+    sha256 = "13khkp2q8g447797l09p83qxy0z8vgmzr54l8dcnapy9lsr4jrqi";
   };
 
+  patches = [
+    # fix log truncation
+    # https://github.com/Yubico/libfido2/issues/318
+    # https://github.com/Yubico/libfido2/pull/319
+    (fetchpatch {
+      url = "https://github.com/Yubico/libfido2/commit/8edb9a204b2f4aeb487e282908c3187f1d02d606.patch";
+      sha256 = "1i360bghwbdccgkzjfzvhilscnwsj9lhfiviy000n928698l4wan";
+    })
+  ];
+
   nativeBuildInputs = [ cmake pkg-config ];
 
-  buildInputs = [ hidapi libcbor openssl ]
+  buildInputs = [ libcbor openssl zlib ]
+    ++ lib.optionals stdenv.isDarwin [ hidapi ]
     ++ lib.optionals stdenv.isLinux [ udev ];
 
   cmakeFlags = [
     "-DUDEV_RULES_DIR=${placeholder "out"}/etc/udev/rules.d"
-    "-DUSE_HIDAPI=1"
     "-DCMAKE_INSTALL_LIBDIR=lib"
+  ] ++ lib.optionals stdenv.isDarwin [
+    "-DUSE_HIDAPI=1"
+  ] ++ lib.optionals stdenv.isLinux [
+    "-DNFC_LINUX=1"
   ];
 
   meta = with lib; {
     description = ''
-    Provides library functionality for FIDO 2.0, including communication with a device over USB.
+      Provides library functionality for FIDO 2.0, including communication with a device over USB.
     '';
     homepage = "https://github.com/Yubico/libfido2";
     license = licenses.bsd2;
diff --git a/pkgs/development/libraries/libglvnd/default.nix b/pkgs/development/libraries/libglvnd/default.nix
index 31a9579a892..65d0651ed41 100644
--- a/pkgs/development/libraries/libglvnd/default.nix
+++ b/pkgs/development/libraries/libglvnd/default.nix
@@ -5,14 +5,14 @@
 
 stdenv.mkDerivation rec {
   pname = "libglvnd";
-  version = "1.3.2";
+  version = "1.3.3";
 
   src = fetchFromGitLab {
     domain = "gitlab.freedesktop.org";
     owner = "glvnd";
     repo = "libglvnd";
     rev = "v${version}";
-    sha256 = "10x7fgb114r4gikdg6flszl3kwzcb9y5qa7sj9936mk0zxhjaylz";
+    sha256 = "0gjk6m3gkdm12bmih2jflp0v5s1ibkixk7mrzrk0cj884m3hy1z6";
   };
 
   nativeBuildInputs = [ autoreconfHook pkg-config python3 addOpenGLRunpath ];
diff --git a/pkgs/development/libraries/libheif/default.nix b/pkgs/development/libraries/libheif/default.nix
index 71dfca5e643..d445a7c3867 100644
--- a/pkgs/development/libraries/libheif/default.nix
+++ b/pkgs/development/libraries/libheif/default.nix
@@ -3,7 +3,7 @@
 
 stdenv.mkDerivation rec {
   pname = "libheif";
-  version = "1.11.0";
+  version = "1.12.0";
 
   outputs = [ "bin" "out" "dev" "man" ];
 
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     owner = "strukturag";
     repo = "libheif";
     rev = "v${version}";
-    sha256 = "sha256-xT0sfYPp5atYXnVpP8TYu2TC9/Z/ClyEP1OTSfcw1gw=";
+    sha256 = "sha256-RjGLaDSBO8T7ijRb5a16aUlkCy5vdFPs4O9caIJo4jI=";
   };
 
   nativeBuildInputs = [ autoreconfHook pkg-config ];
diff --git a/pkgs/development/libraries/libmwaw/default.nix b/pkgs/development/libraries/libmwaw/default.nix
index 1b8c30f9a8f..aa42edfeadb 100644
--- a/pkgs/development/libraries/libmwaw/default.nix
+++ b/pkgs/development/libraries/libmwaw/default.nix
@@ -3,11 +3,11 @@ let
   s = # Generated upstream information
   rec {
     baseName="libmwaw";
-    version="0.3.18";
+    version="0.3.19";
     name="${baseName}-${version}";
-    hash="sha256-/F0FFoD4AAvmT/68CwxYcWscm/BgA+w5k4exCdHtHg8=";
-    url="mirror://sourceforge/libmwaw/libmwaw/libmwaw-0.3.18/libmwaw-0.3.18.tar.xz";
-    sha256="sha256-/F0FFoD4AAvmT/68CwxYcWscm/BgA+w5k4exCdHtHg8=";
+    hash="sha256-snLiNO78goxLuDRK8PBHpi4HD1MOni+6EbBMjbjtpa8=";
+    url="mirror://sourceforge/libmwaw/libmwaw/libmwaw-0.3.19/libmwaw-0.3.19.tar.xz";
+    sha256="sha256-snLiNO78goxLuDRK8PBHpi4HD1MOni+6EbBMjbjtpa8=";
   };
 
   nativeBuildInputs = [ pkg-config ];
diff --git a/pkgs/development/libraries/libxkbcommon/default.nix b/pkgs/development/libraries/libxkbcommon/default.nix
index 8c37bb0c173..b738089c853 100644
--- a/pkgs/development/libraries/libxkbcommon/default.nix
+++ b/pkgs/development/libraries/libxkbcommon/default.nix
@@ -1,34 +1,46 @@
-{ lib, stdenv, fetchurl, meson, ninja, pkg-config, bison, doxygen
-, xkeyboard_config, libxcb, libxml2
+{ lib
+, stdenv
+, fetchurl
+, meson
+, ninja
+, pkg-config
+, bison
+, doxygen
+, xkeyboard_config
+, libxcb
+, libxml2
 , python3
 , libX11
-# To enable the "interactive-wayland" subcommand of xkbcli:
-, withWaylandSupport ? false, wayland, wayland-protocols
+  # To enable the "interactive-wayland" subcommand of xkbcli. This is the
+  # wayland equivalent of `xev` on X11.
+, withWaylandTools ? stdenv.isLinux
+, wayland
+, wayland-protocols
 }:
 
 stdenv.mkDerivation rec {
   pname = "libxkbcommon";
-  version = "1.2.1";
+  version = "1.3.0";
 
   src = fetchurl {
     url = "https://xkbcommon.org/download/${pname}-${version}.tar.xz";
-    sha256 = "1cqzd4vd5jw3ghibmdqvy90mb1h8vvazc81bxgavk6sc0b9sfcz8";
+    sha256 = "0ysynzzgzd9jdrh1321r4bgw8wd5zljrlyn5y1a31g39xacf02bv";
   };
 
   outputs = [ "out" "dev" "doc" ];
 
   depsBuildBuild = [ pkg-config ];
   nativeBuildInputs = [ meson ninja pkg-config bison doxygen ]
-    ++ lib.optional withWaylandSupport wayland;
+    ++ lib.optional withWaylandTools wayland;
   buildInputs = [ xkeyboard_config libxcb libxml2 ]
-    ++ lib.optionals withWaylandSupport [ wayland wayland-protocols ];
+    ++ lib.optionals withWaylandTools [ wayland wayland-protocols ];
   checkInputs = [ python3 ];
 
   mesonFlags = [
     "-Dxkb-config-root=${xkeyboard_config}/etc/X11/xkb"
     "-Dxkb-config-extra-path=/etc/xkb" # default=$sysconfdir/xkb ($out/etc)
     "-Dx-locale-root=${libX11.out}/share/X11/locale"
-    "-Denable-wayland=${lib.boolToString withWaylandSupport}"
+    "-Denable-wayland=${lib.boolToString withWaylandTools}"
   ];
 
   doCheck = true;
diff --git a/pkgs/development/libraries/mesa/default.nix b/pkgs/development/libraries/mesa/default.nix
index 3be50b5dbd9..743080ee82e 100644
--- a/pkgs/development/libraries/mesa/default.nix
+++ b/pkgs/development/libraries/mesa/default.nix
@@ -122,7 +122,7 @@ self = stdenv.mkDerivation {
   ];
 
   buildInputs = with xorg; [
-    expat llvmPackages.llvm libglvnd xorgproto
+    expat llvmPackages.libllvm libglvnd xorgproto
     libX11 libXext libxcb libXt libXfixes libxshmfence libXrandr
     libffi libvdpau libelf libXvMC
     libpthreadstubs openssl /*or another sha1 provider*/
diff --git a/pkgs/development/libraries/nss/3.44.nix b/pkgs/development/libraries/nss/3.44.nix
deleted file mode 100644
index b08b8b3ed2a..00000000000
--- a/pkgs/development/libraries/nss/3.44.nix
+++ /dev/null
@@ -1,144 +0,0 @@
-{ lib, stdenv, fetchurl, nspr, perl, zlib, sqlite, fixDarwinDylibNames, buildPackages }:
-
-let
-  nssPEM = fetchurl {
-    url = "http://dev.gentoo.org/~polynomial-c/mozilla/nss-3.15.4-pem-support-20140109.patch.xz";
-    sha256 = "10ibz6y0hknac15zr6dw4gv9nb5r5z9ym6gq18j3xqx7v7n3vpdw";
-  };
-  version = "3.44.4";
-  underscoreVersion = builtins.replaceStrings ["."] ["_"] version;
-
-in stdenv.mkDerivation rec {
-  pname = "nss";
-  inherit version;
-
-  src = fetchurl {
-    url = "mirror://mozilla/security/nss/releases/NSS_${underscoreVersion}_RTM/src/${pname}-${version}.tar.gz";
-    sha256 = "7ec1a52e20fd9a23e1907eeba8f4f2ecd619dac5d20fa023ec5b4faa1843e847";
-  };
-
-  depsBuildBuild = [ buildPackages.stdenv.cc ];
-
-  nativeBuildInputs = [ perl ]
-    ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
-
-  buildInputs = [ zlib sqlite ];
-
-  propagatedBuildInputs = [ nspr ];
-
-  prePatch = ''
-    xz -d < ${nssPEM} | patch -p1
-  '';
-
-  patches =
-    [
-      # Based on http://patch-tracker.debian.org/patch/series/dl/nss/2:3.15.4-1/85_security_load.patch
-      ./85_security_load-3.44.patch
-      ./ckpem.patch
-    ];
-
-  patchFlags = [ "-p0" ];
-
-  postPatch = lib.optionalString stdenv.isDarwin ''
-    substituteInPlace nss/coreconf/Darwin.mk --replace '@executable_path/$(notdir $@)' "$out/lib/\$(notdir \$@)"
-  '';
-
-  outputs = [ "out" "dev" "tools" ];
-
-  preConfigure = "cd nss";
-
-  makeFlags = let
-    # NSS's build systems expects aarch32 to be called arm; if we pass in armv6l/armv7l, it
-    # fails with a linker error
-    cpu = if stdenv.hostPlatform.isAarch32 then "arm" else stdenv.hostPlatform.parsed.cpu.name;
-  in [
-    "NSPR_INCLUDE_DIR=${nspr.dev}/include"
-    "NSPR_LIB_DIR=${nspr.out}/lib"
-    "NSDISTMODE=copy"
-    "BUILD_OPT=1"
-    "SOURCE_PREFIX=\$(out)"
-    "NSS_ENABLE_ECC=1"
-    "USE_SYSTEM_ZLIB=1"
-    "NSS_USE_SYSTEM_SQLITE=1"
-    "NATIVE_CC=${buildPackages.stdenv.cc}/bin/cc"
-  ] ++ lib.optionals (!stdenv.isDarwin) [
-    # Pass in CPU even if we're not cross compiling, because otherwise it tries to guess with
-    # uname, which can be wrong if e.g. we're compiling for aarch32 on aarch64
-    "OS_TEST=${cpu}"
-    "CPU_ARCH=${cpu}"
-  ] ++ lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) [
-    "CROSS_COMPILE=1"
-    "NSS_DISABLE_GTESTS=1" # don't want to build tests when cross-compiling
-  ] ++ lib.optional stdenv.is64bit "USE_64=1"
-    ++ lib.optional stdenv.isDarwin "CCC=clang++";
-
-  NIX_CFLAGS_COMPILE = "-Wno-error";
-
-  # TODO(@oxij): investigate this: `make -n check` works but `make
-  # check` fails with "no rule", same for "installcheck".
-  doCheck = false;
-  doInstallCheck = false;
-
-  postInstall = ''
-    rm -rf $out/private
-    mv $out/public $out/include
-    mv $out/*.OBJ/* $out/
-    rmdir $out/*.OBJ
-
-    ln -s lib $out/lib64
-
-    # Upstream issue: https://bugzilla.mozilla.org/show_bug.cgi?id=530672
-    # https://gitweb.gentoo.org/repo/gentoo.git/plain/dev-libs/nss/files/nss-3.32-gentoo-fixups.patch?id=af1acce6c6d2c3adb17689261dfe2c2b6771ab8a
-    NSS_MAJOR_VERSION=`grep "NSS_VMAJOR" lib/nss/nss.h | awk '{print $3}'`
-    NSS_MINOR_VERSION=`grep "NSS_VMINOR" lib/nss/nss.h | awk '{print $3}'`
-    NSS_PATCH_VERSION=`grep "NSS_VPATCH" lib/nss/nss.h | awk '{print $3}'`
-    PREFIX="$out"
-
-    mkdir -p $out/lib/pkgconfig
-    sed -e "s,%prefix%,$PREFIX," \
-        -e "s,%exec_prefix%,$PREFIX," \
-        -e "s,%libdir%,$PREFIX/lib64," \
-        -e "s,%includedir%,$dev/include/nss," \
-        -e "s,%NSS_VERSION%,$NSS_MAJOR_VERSION.$NSS_MINOR_VERSION.$NSS_PATCH_VERSION,g" \
-        -e "s,%NSPR_VERSION%,4.16,g" \
-        pkg/pkg-config/nss.pc.in > $out/lib/pkgconfig/nss.pc
-    chmod 0644 $out/lib/pkgconfig/nss.pc
-
-    sed -e "s,@prefix@,$PREFIX," \
-        -e "s,@MOD_MAJOR_VERSION@,$NSS_MAJOR_VERSION," \
-        -e "s,@MOD_MINOR_VERSION@,$NSS_MINOR_VERSION," \
-        -e "s,@MOD_PATCH_VERSION@,$NSS_PATCH_VERSION," \
-        pkg/pkg-config/nss-config.in > $out/bin/nss-config
-    chmod 0755 $out/bin/nss-config
-  '';
-
-  postFixup = let
-    isCross = stdenv.hostPlatform != stdenv.buildPlatform;
-    nss = if isCross then buildPackages.nss.tools else "$out";
-  in ''
-    for libname in freebl3 nssdbm3 softokn3
-    do '' +
-    (if stdenv.isDarwin
-     then ''
-       libfile="$out/lib/lib$libname.dylib"
-       DYLD_LIBRARY_PATH=$out/lib:${nspr.out}/lib \
-     '' else ''
-       libfile="$out/lib/lib$libname.so"
-       LD_LIBRARY_PATH=$out/lib:${nspr.out}/lib \
-     '') + ''
-        ${nss}/bin/shlibsign -v -i "$libfile"
-    done
-
-    moveToOutput bin "$tools"
-    moveToOutput bin/nss-config "$dev"
-    moveToOutput lib/libcrmf.a "$dev" # needed by firefox, for example
-    rm -f "$out"/lib/*.a
-  '';
-
-  meta = with lib; {
-    homepage = "https://developer.mozilla.org/en-US/docs/NSS";
-    description = "A set of libraries for development of security-enabled client and server applications";
-    license = licenses.mpl20;
-    platforms = platforms.all;
-  };
-}
diff --git a/pkgs/development/libraries/nss/85_security_load-3.44.patch b/pkgs/development/libraries/nss/85_security_load-3.44.patch
deleted file mode 100644
index 132d5a96b29..00000000000
--- a/pkgs/development/libraries/nss/85_security_load-3.44.patch
+++ /dev/null
@@ -1,81 +0,0 @@
-diff -ru -x '*~' -x '*.orig' -x '*.rej' nss/cmd/shlibsign/shlibsign.c nss/cmd/shlibsign/shlibsign.c
---- nss/cmd/shlibsign/shlibsign.c	2017-01-04 15:24:24.000000000 +0100
-+++ nss/cmd/shlibsign/shlibsign.c	2017-01-24 14:43:31.030420852 +0100
-@@ -875,6 +875,8 @@
-         goto cleanup;
-     }
-     lib = PR_LoadLibrary(libname);
-+    if (!lib)
-+        lib = PR_LoadLibrary(NIX_NSS_LIBDIR"libsoftokn3.so");
-     assert(lib != NULL);
-     if (!lib) {
-         PR_fprintf(PR_STDERR, "loading softokn3 failed");
-diff -ru -x '*~' -x '*.orig' -x '*.rej' nss/coreconf/config.mk nss/coreconf/config.mk
---- nss/coreconf/config.mk	2017-01-04 15:24:24.000000000 +0100
-+++ nss/coreconf/config.mk	2017-01-24 14:43:47.989432372 +0100
-@@ -202,3 +202,6 @@
- 
- # Hide old, deprecated, TLS cipher suite names when building NSS
- DEFINES += -DSSL_DISABLE_DEPRECATED_CIPHER_SUITE_NAMES
-+
-+# Nix specific stuff.
-+DEFINES += -DNIX_NSS_LIBDIR=\"$(out)/lib/\"
-diff -ru -x '*~' -x '*.orig' -x '*.rej' nss/lib/pk11wrap/pk11load.c nss/lib/pk11wrap/pk11load.c
---- nss/lib/pk11wrap/pk11load.c	2017-01-04 15:24:24.000000000 +0100
-+++ nss/lib/pk11wrap/pk11load.c	2017-01-24 14:45:06.883485652 +0100
-@@ -440,6 +440,13 @@
-          * unload the library if anything goes wrong from here on out...
-          */
-         library = PR_LoadLibrary(mod->dllName);
-+        if ((library == NULL) &&
-+            !rindex(mod->dllName, PR_GetDirectorySeparator())) {
-+            library = PORT_LoadLibraryFromOrigin(my_shlib_name,
-+                (PRFuncPtr) &softoken_LoadDSO,
-+                mod->dllName);
-+        }
-+
-         mod->library = (void *)library;
- 
-         if (library == NULL) {
-diff -ru -x '*~' -x '*.orig' -x '*.rej' nss/lib/util/secload.c nss/lib/util/secload.c
---- nss/lib/util/secload.c	2017-01-04 15:24:24.000000000 +0100
-+++ nss/lib/util/secload.c	2017-01-24 14:43:31.030420852 +0100
-@@ -70,9 +70,14 @@
- 
-     /* Remove the trailing filename from referencePath and add the new one */
-     c = strrchr(referencePath, PR_GetDirectorySeparator());
-+    if (!c) { /* referencePath doesn't contain a / means that dladdr gave us argv[0]
-+               * and program was called from $PATH. Hack to get libs from NIX_NSS_LIBDIR */
-+        referencePath = NIX_NSS_LIBDIR;
-+        c = (char*) &referencePath[sizeof(NIX_NSS_LIBDIR) - 1]; /* last / */
-+    }
-     if (c) {
-         size_t referencePathSize = 1 + c - referencePath;
--        fullName = (char*)PORT_Alloc(strlen(name) + referencePathSize + 1);
-+        fullName = (char*) PORT_Alloc(strlen(name) + referencePathSize + 5);
-         if (fullName) {
-             memcpy(fullName, referencePath, referencePathSize);
-             strcpy(fullName + referencePathSize, name);
-@@ -82,6 +87,11 @@
- #endif
-             libSpec.type = PR_LibSpec_Pathname;
-             libSpec.value.pathname = fullName;
-+            if ((referencePathSize >= 4) &&
-+                (strncmp(fullName + referencePathSize - 4, "bin", 3) == 0)) {
-+                memcpy(fullName + referencePathSize -4, "lib", 3);
-+            }
-+            strcpy(fullName + referencePathSize, name);
-             dlh = PR_LoadLibraryWithFlags(libSpec, PR_LD_NOW | PR_LD_LOCAL
- #ifdef PR_LD_ALT_SEARCH_PATH
-                                                        /* allow library's dependencies to be found in the same directory
-@@ -89,6 +99,10 @@
-                                                        | PR_LD_ALT_SEARCH_PATH
- #endif
-                                           );
-+            if (! dlh) {
-+                strcpy(fullName + referencePathSize, name);
-+                dlh = PR_LoadLibraryWithFlags(libSpec, PR_LD_NOW | PR_LD_LOCAL);
-+            }
-             PORT_Free(fullName);
-         }
-     }
diff --git a/pkgs/development/libraries/opencl-clang/default.nix b/pkgs/development/libraries/opencl-clang/default.nix
index 8bbde9796d9..c40fb9c1203 100644
--- a/pkgs/development/libraries/opencl-clang/default.nix
+++ b/pkgs/development/libraries/opencl-clang/default.nix
@@ -32,7 +32,9 @@ let
 
   passthru = rec {
 
-    clang-unwrapped = addPatches "clang" llvmPkgs.clang-unwrapped;
+    libclang = addPatches "clang" llvmPkgs.libclang;
+
+    clang-unwrapped = libclang.out;
 
     clang = llvmPkgs.clang.override {
       cc = clang-unwrapped;
@@ -53,7 +55,7 @@ let
 
   library = let
     inherit (llvmPkgs) llvm;
-    inherit (if buildWithPatches then passthru else llvmPkgs) clang-unwrapped spirv-llvm-translator;
+    inherit (if buildWithPatches then passthru else llvmPkgs) libclang spirv-llvm-translator;
   in
     stdenv.mkDerivation rec {
       pname = "opencl-clang";
@@ -74,13 +76,13 @@ let
         ./opencl-headers-dir.patch
       ];
 
-      nativeBuildInputs = [ cmake git ];
+      nativeBuildInputs = [ cmake git llvm.dev ];
 
-      buildInputs = [ clang-unwrapped llvm spirv-llvm-translator ];
+      buildInputs = [ libclang llvm spirv-llvm-translator ];
 
       cmakeFlags = [
         "-DPREFERRED_LLVM_VERSION=${getVersion llvm}"
-        "-DOPENCL_HEADERS_DIR=${clang-unwrapped}/lib/clang/${getVersion clang-unwrapped}/include/"
+        "-DOPENCL_HEADERS_DIR=${libclang.lib}/lib/clang/${getVersion libclang}/include/"
 
         "-DLLVMSPIRV_INCLUDED_IN_LLVM=OFF"
         "-DSPIRV_TRANSLATOR_DIR=${spirv-llvm-translator}"
diff --git a/pkgs/development/libraries/openldap/default.nix b/pkgs/development/libraries/openldap/default.nix
index 39831a3baf0..fe4704341ef 100644
--- a/pkgs/development/libraries/openldap/default.nix
+++ b/pkgs/development/libraries/openldap/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, openssl, db, groff, libtool
+{ lib, stdenv, fetchurl, openssl, db, groff, libtool, libsodium
 , withCyrusSasl ? true
 , cyrus_sasl
 }:
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ groff ];
 
-  buildInputs = [ openssl cyrus_sasl db libtool ];
+  buildInputs = [ openssl cyrus_sasl db libsodium libtool ];
 
   # Disable install stripping as it breaks cross-compiling.
   # We strip binaries anyway in fixupPhase.
@@ -46,6 +46,7 @@ stdenv.mkDerivation rec {
   postBuild = ''
     make $makeFlags CC=$CC -C contrib/slapd-modules/passwd/sha2
     make $makeFlags CC=$CC -C contrib/slapd-modules/passwd/pbkdf2
+    make $makeFlags CC=$CC -C contrib/slapd-modules/passwd/argon2
   '';
 
   doCheck = false; # needs a running LDAP server
@@ -54,6 +55,9 @@ stdenv.mkDerivation rec {
     "sysconfdir=$(out)/etc"
     "localstatedir=$(out)/var"
     "moduledir=$(out)/lib/modules"
+    # The argon2 module hardcodes /usr/bin/install as the path for the
+    # `install` binary, which is overridden here.
+    "INSTALL=install"
   ];
 
   # 1. Libraries left in the build location confuse `patchelf --shrink-rpath`
@@ -76,6 +80,7 @@ stdenv.mkDerivation rec {
   postInstall = ''
     make $installFlags install -C contrib/slapd-modules/passwd/sha2
     make $installFlags install -C contrib/slapd-modules/passwd/pbkdf2
+    make $installFlags install-lib -C contrib/slapd-modules/passwd/argon2
     chmod +x "$out"/lib/*.{so,dylib}
   '';
 
diff --git a/pkgs/development/libraries/openssl/default.nix b/pkgs/development/libraries/openssl/default.nix
index 13cac47793e..a336dd18fae 100644
--- a/pkgs/development/libraries/openssl/default.nix
+++ b/pkgs/development/libraries/openssl/default.nix
@@ -125,8 +125,6 @@ let
       if [ -n "$(echo $out/lib/*.so $out/lib/*.dylib $out/lib/*.dll)" ]; then
           rm "$out/lib/"*.a
       fi
-
-      mkdir -p $bin
     '' + lib.optionalString (!stdenv.hostPlatform.isWindows)
       # Fix bin/c_rehash's perl interpreter line
       #
@@ -140,9 +138,9 @@ let
       # "#!/usr/bin/env perl"
     ''
       substituteInPlace $out/bin/c_rehash --replace ${buildPackages.perl}/bin/perl "/usr/bin/env perl"
-    '' +
-    ''
-      mv $out/bin $bin/
+    '' + ''
+      mkdir -p $bin
+      mv $out/bin $bin/bin
 
       mkdir $dev
       mv $out/include $dev/
diff --git a/pkgs/development/libraries/plasma-wayland-protocols/default.nix b/pkgs/development/libraries/plasma-wayland-protocols/default.nix
index 2d3a5239d7b..ea02eb428db 100644
--- a/pkgs/development/libraries/plasma-wayland-protocols/default.nix
+++ b/pkgs/development/libraries/plasma-wayland-protocols/default.nix
@@ -5,11 +5,11 @@
 
 mkDerivation rec {
   pname = "plasma-wayland-protocols";
-  version = "1.1.1";
+  version = "1.2.1";
 
   src = fetchurl {
-    url = "mirror://kde/stable/${pname}/${version}/${pname}-${version}.tar.xz";
-    sha256 = "sha256-xUkzg9EVFxw0NeqaIbOWaGBjKoRFRP+sj1SJBDalHTg=";
+    url = "mirror://kde/stable/${pname}/${pname}-v${version}.tar.xz";
+    sha256 = "sha256-KHuQkD+afzlMdedcsYdCaGLq9kqS8b5+LvaOmf2Muqo=";
   };
 
   nativeBuildInputs = [ extra-cmake-modules ];
diff --git a/pkgs/development/libraries/protobuf/3.15.nix b/pkgs/development/libraries/protobuf/3.15.nix
index 661a552882e..e4783be6a35 100644
--- a/pkgs/development/libraries/protobuf/3.15.nix
+++ b/pkgs/development/libraries/protobuf/3.15.nix
@@ -1,6 +1,6 @@
 { callPackage, ... }:
 
 callPackage ./generic-v3.nix {
-  version = "3.15.7";
-  sha256 = "03fx96rwxfbmr47f1nrflvaq5kk5p3a9wms4688nbnmymyghyml0";
+  version = "3.15.8";
+  sha256 = "1q3k8axhq6g8fqczmd6kbgzpdplrrgygppym4x1l99lzhplx9rqv";
 }
diff --git a/pkgs/development/libraries/protobuf/3.16.nix b/pkgs/development/libraries/protobuf/3.16.nix
new file mode 100644
index 00000000000..df8d53b9f1c
--- /dev/null
+++ b/pkgs/development/libraries/protobuf/3.16.nix
@@ -0,0 +1,6 @@
+{ callPackage, ... }:
+
+callPackage ./generic-v3.nix {
+  version = "3.16.0";
+  sha256 = "0jc523ys6xh1fk3l52f5mfqxhb4g8aim1js7330v0fdc3fjr8ncf";
+}
diff --git a/pkgs/development/libraries/pslib/default.nix b/pkgs/development/libraries/pslib/default.nix
index ec2362009ff..b3439b7ee96 100644
--- a/pkgs/development/libraries/pslib/default.nix
+++ b/pkgs/development/libraries/pslib/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, cmake, pkg-config, zlib, libpng, libjpeg, libungif, libtiff
+{ lib, stdenv, fetchurl, cmake, pkg-config, zlib, libpng, libjpeg, giflib, libtiff
 }:
 
 stdenv.mkDerivation rec {
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   };
 
   nativeBuildInputs = [ cmake pkg-config ];
-  buildInputs = [ zlib libpng libjpeg libungif libtiff ];
+  buildInputs = [ zlib libpng libjpeg giflib libtiff ];
 
   doCheck = true;
 
diff --git a/pkgs/development/libraries/qt-4.x/4.8/default.nix b/pkgs/development/libraries/qt-4.x/4.8/default.nix
index a4ac41d81df..532a72c820c 100644
--- a/pkgs/development/libraries/qt-4.x/4.8/default.nix
+++ b/pkgs/development/libraries/qt-4.x/4.8/default.nix
@@ -204,7 +204,7 @@ stdenv.mkDerivation rec {
     ++ lib.optional stdenv.isLinux "-std=gnu++98" # gnu++ in (Obj)C flags is no good on Darwin
     ++ lib.optionals (stdenv.isFreeBSD || stdenv.isDarwin)
       [ "-I${glib.dev}/include/glib-2.0" "-I${glib.out}/lib/glib-2.0/include" ]
-    ++ lib.optional stdenv.isDarwin "-I${libcxx}/include/c++/v1");
+    ++ lib.optional stdenv.isDarwin "-I${lib.getDev libcxx}/include/c++/v1");
 
   NIX_LDFLAGS = lib.optionalString (stdenv.isFreeBSD || stdenv.isDarwin) "-lglib-2.0";
 
diff --git a/pkgs/development/libraries/qt-5/qtModule.nix b/pkgs/development/libraries/qt-5/qtModule.nix
index 930ed9d67ba..ebd6e887ec9 100644
--- a/pkgs/development/libraries/qt-5/qtModule.nix
+++ b/pkgs/development/libraries/qt-5/qtModule.nix
@@ -7,15 +7,14 @@ let inherit (lib) licenses maintainers platforms; in
 args:
 
 let
-  inherit (args) name;
-  version = args.version or srcs.${name}.version;
-  src = args.src or srcs.${name}.src;
+  pname = args.name;
+  version = args.version or srcs.${pname}.version;
+  src = args.src or srcs.${pname}.src;
 in
 
 mkDerivation (args // {
-  name = "${name}-${version}";
-  inherit src;
-  patches = args.patches or patches.${name} or [];
+  inherit pname version src;
+  patches = args.patches or patches.${pname} or [];
 
   nativeBuildInputs = (args.nativeBuildInputs or []) ++ [ perl self.qmake ];
   propagatedBuildInputs = args.qtInputs ++ (args.propagatedBuildInputs or []);
diff --git a/pkgs/development/libraries/re2/default.nix b/pkgs/development/libraries/re2/default.nix
index 2d8d0059764..9b7a2e91011 100644
--- a/pkgs/development/libraries/re2/default.nix
+++ b/pkgs/development/libraries/re2/default.nix
@@ -1,14 +1,14 @@
 { lib, stdenv, fetchFromGitHub }:
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   pname = "re2";
-  version = "20201001";
+  version = "2021-04-01";
 
   src = fetchFromGitHub {
     owner = "google";
     repo = "re2";
-    rev = "2020-10-01";
-    sha256 = "0a5f7av1pk6p3jxc2w6prl00lyrplap97m68hnhw7jllnwljk0bx";
+    rev = version;
+    sha256 = "1iia0883lssj7ckbsr0n7yb3gdw24c8wnl2q5hhzlml23h4ipbh3";
   };
 
   preConfigure = ''
diff --git a/pkgs/development/libraries/readline/8.0.nix b/pkgs/development/libraries/readline/8.1.nix
index 9ea0277467e..35835c1a143 100644
--- a/pkgs/development/libraries/readline/8.0.nix
+++ b/pkgs/development/libraries/readline/8.1.nix
@@ -1,13 +1,13 @@
-{ fetchurl, lib, stdenv, ncurses
+{ fetchurl, stdenv, lib, ncurses
 }:
 
 stdenv.mkDerivation rec {
   pname = "readline";
-  version = "8.0p${toString (builtins.length upstreamPatches)}";
+  version = "8.1p${toString (builtins.length upstreamPatches)}";
 
   src = fetchurl {
     url = "mirror://gnu/readline/readline-${meta.branch}.tar.gz";
-    sha256 = "0qg4924hf4hg0r0wbx2chswsr08734536fh5iagkd3a7f4czafg3";
+    sha256 = "00ibp0n9crbwx15k9vvckq5wsipw98b1px8pd8i34chy2gpb9kpq";
   };
 
   outputs = [ "out" "dev" "man" "doc" "info" ];
@@ -20,11 +20,11 @@ stdenv.mkDerivation rec {
     (let
        patch = nr: sha256:
          fetchurl {
-           url = "mirror://gnu/readline/readline-${meta.branch}-patches/readline80-${nr}";
+           url = "mirror://gnu/readline/readline-${meta.branch}-patches/readline81-${nr}";
            inherit sha256;
          };
      in
-       import ./readline-8.0-patches.nix patch);
+       import ./readline-8.1-patches.nix patch);
 
   patches =
     [ ./link-against-ncurses.patch
@@ -57,6 +57,6 @@ stdenv.mkDerivation rec {
     maintainers = with maintainers; [ dtzWill ];
 
     platforms = platforms.unix;
-    branch = "8.0";
+    branch = "8.1";
   };
 }
diff --git a/pkgs/development/libraries/readline/readline-8.0-patches.nix b/pkgs/development/libraries/readline/readline-8.0-patches.nix
deleted file mode 100644
index 2fac6a413c7..00000000000
--- a/pkgs/development/libraries/readline/readline-8.0-patches.nix
+++ /dev/null
@@ -1,8 +0,0 @@
-# Automatically generated by `update-patch-set.sh'; do not edit.
-
-patch: [
-(patch "001" "0sfh7wn0pr743xspnb1zndxndlv9rc0hcg14cbw5cmyg6f4ykrfq")
-(patch "002" "1xy8mv8xm8hsfixwp3ci9kfx3dii3y92cq27wwd0jq75y6zzxc1n")
-(patch "003" "1vza7sxjcsr2z295ij12nzgncdil1vb6as3mqy4m7svi1chv5pcl")
-(patch "004" "0k1rfx9w32lglxg564yvp0mw6jg6883p8ac2f2lxxqpf80m3vami")
-]
diff --git a/pkgs/development/libraries/readline/readline-8.1-patches.nix b/pkgs/development/libraries/readline/readline-8.1-patches.nix
new file mode 100644
index 00000000000..b8019fb3350
--- /dev/null
+++ b/pkgs/development/libraries/readline/readline-8.1-patches.nix
@@ -0,0 +1,4 @@
+# Automatically generated by `update-patch-set.sh'; do not edit.
+
+patch: [
+]
diff --git a/pkgs/development/libraries/tk/generic.nix b/pkgs/development/libraries/tk/generic.nix
index 57dc3dac2d0..ecb3840b2de 100644
--- a/pkgs/development/libraries/tk/generic.nix
+++ b/pkgs/development/libraries/tk/generic.nix
@@ -16,6 +16,12 @@ stdenv.mkDerivation {
     cd unix
   '';
 
+  postPatch = ''
+    for file in $(find library/demos/. -type f ! -name "*.*"); do
+      substituteInPlace $file --replace "exec wish" "exec $out/bin/wish"
+    done
+  '';
+
   postInstall = ''
     ln -s $out/bin/wish* $out/bin/wish
     cp ../{unix,generic}/*.h $out/include
diff --git a/pkgs/development/libraries/wayland/default.nix b/pkgs/development/libraries/wayland/default.nix
index 07671ddebdd..4a685b43073 100644
--- a/pkgs/development/libraries/wayland/default.nix
+++ b/pkgs/development/libraries/wayland/default.nix
@@ -5,7 +5,7 @@
 , meson
 , pkg-config
 , ninja
-, wayland
+, wayland-scanner
 , expat
 , libxml2
 , withLibraries ? stdenv.isLinux
@@ -64,7 +64,7 @@ stdenv.mkDerivation rec {
     pkg-config
     ninja
   ] ++ lib.optionals isCross [
-    wayland # For wayland-scanner during the build
+    wayland-scanner
   ] ++ lib.optionals withDocumentation [
     (graphviz-nox.override { pango = null; }) # To avoid an infinite recursion
     doxygen
@@ -85,6 +85,18 @@ stdenv.mkDerivation rec {
     docbook_xml_dtd_42
   ];
 
+  postFixup = ''
+    # The pkg-config file is required for cross-compilation:
+    mkdir -p $bin/lib/pkgconfig/
+    cat <<EOF > $bin/lib/pkgconfig/wayland-scanner.pc
+    wayland_scanner=$bin/bin/wayland-scanner
+
+    Name: Wayland Scanner
+    Description: Wayland scanner
+    Version: ${version}
+    EOF
+  '';
+
   meta = with lib; {
     description = "Core Wayland window system code and protocol";
     longDescription = ''
diff --git a/pkgs/development/libraries/wayland/protocols.nix b/pkgs/development/libraries/wayland/protocols.nix
index 23258aff3e9..8a2b05aa4df 100644
--- a/pkgs/development/libraries/wayland/protocols.nix
+++ b/pkgs/development/libraries/wayland/protocols.nix
@@ -1,19 +1,15 @@
-{ lib, stdenv, fetchurl, pkg-config
-, wayland
-}:
+{ lib, stdenv, fetchurl, wayland-scanner }:
 
 stdenv.mkDerivation rec {
   pname = "wayland-protocols";
-  version = "1.20";
+  version = "1.21";
 
   src = fetchurl {
     url = "https://wayland.freedesktop.org/releases/${pname}-${version}.tar.xz";
-    sha256 = "1rsdgvkkvxs3cjhpl6agvbkm53vm7k8rg127j9y2vn33m2hvg0lp";
+    sha256 = "1rfdlkzz67qsb955zqb8jbw3m22pl6ppvrvfq8bqiqcb5n24b6dr";
   };
 
-  nativeBuildInputs = [ pkg-config ];
-
-  buildInputs = [ wayland ];
+  nativeBuildInputs = [ wayland-scanner ];
 
   meta = {
     description = "Wayland protocol extensions";
diff --git a/pkgs/development/libraries/wlroots/0.12.nix b/pkgs/development/libraries/wlroots/0.12.nix
index 66d4fab2bf9..c21205beabc 100644
--- a/pkgs/development/libraries/wlroots/0.12.nix
+++ b/pkgs/development/libraries/wlroots/0.12.nix
@@ -30,6 +30,8 @@ stdenv.mkDerivation rec {
 
   mesonFlags = [ "-Dlogind-provider=systemd" "-Dlibseat=disabled" ];
 
+  CFLAGS = "-Wno-error=deprecated-declarations";
+
   postFixup = ''
     # Install ALL example programs to $examples:
     # screencopy dmabuf-capture input-inhibitor layer-shell idle-inhibit idle
diff --git a/pkgs/development/misc/umr/default.nix b/pkgs/development/misc/umr/default.nix
index 158cef2eed1..3dba51022d3 100644
--- a/pkgs/development/misc/umr/default.nix
+++ b/pkgs/development/misc/umr/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
     sha256 = "IwTkHEuJ82hngPjFVIihU2rSolLBqHxQTNsP8puYPaY=";
   };
 
-  nativeBuildInputs = [ cmake pkg-config ];
+  nativeBuildInputs = [ cmake pkg-config llvmPackages.llvm.dev ];
 
   buildInputs = [
     bash-completion
diff --git a/pkgs/development/ocaml-modules/camlimages/4.0.nix b/pkgs/development/ocaml-modules/camlimages/4.0.nix
deleted file mode 100644
index 26735b1c5d7..00000000000
--- a/pkgs/development/ocaml-modules/camlimages/4.0.nix
+++ /dev/null
@@ -1,41 +0,0 @@
-{ lib, stdenv, fetchurl, omake, ocaml, libtiff, libjpeg, libpng, giflib, findlib, libXpm, freetype, graphicsmagick, ghostscript }:
-
-let
-  pname = "camlimages";
-  version = "4.0.1";
-in
-
-stdenv.mkDerivation {
-  name = "${pname}-${version}";
-
-  src = fetchurl {
-    url = "https://bitbucket.org/camlspotter/camlimages/get/v4.0.1.tar.gz";
-    sha256 = "b40237c1505487049799a7af296eb3996b3fa08eab94415546f46d61355747c4";
-  };
-
-  buildInputs = [ ocaml omake findlib graphicsmagick ghostscript ];
-
-  propagatedBuildInputs = [libtiff libjpeg libpng giflib freetype libXpm ];
-
-  createFindlibDestdir = true;
-
-  preConfigure = ''
-    rm ./configure
-  '';
-
-  buildPhase = ''
-    omake
-  '';
-
-  installPhase = ''
-    omake install
-  '';
-
-  meta = with lib; {
-    branch = "4.0";
-    homepage = "https://bitbucket.org/camlspotter/camlimages";
-    description = "OCaml image processing library";
-    license = licenses.lgpl2;
-    maintainers = [ maintainers.vbgl ];
-  };
-}
diff --git a/pkgs/development/ocaml-modules/camlimages/4.1.2.nix b/pkgs/development/ocaml-modules/camlimages/4.1.2.nix
new file mode 100644
index 00000000000..dba303afdf2
--- /dev/null
+++ b/pkgs/development/ocaml-modules/camlimages/4.1.2.nix
@@ -0,0 +1,37 @@
+{ lib, stdenv, fetchFromGitLab, fetchpatch, omake, ocaml, findlib
+, graphicsmagick, ghostscript
+, freetype, giflib, libjpeg, libpng, libtiff, libXpm
+}:
+
+stdenv.mkDerivation rec {
+  pname = "camlimages";
+  version = "4.1.2";
+
+  src = fetchFromGitLab {
+    owner = "camlspotter";
+    repo = "camlimages";
+    rev = "98661d507e12ce91a51295a50f244cb8265b4439"; # no tag
+    sha256 = "0kpxj8wm2m17wjq217jzjpfgv1d7sp4w1yd1gi8ipn5rj4sid2j8";
+  };
+
+  buildInputs = [ ocaml omake findlib graphicsmagick ghostscript ];
+  propagatedBuildInputs = [ libtiff libjpeg libpng giflib freetype libXpm ];
+
+  createFindlibDestdir = true;
+
+  buildPhase = ''
+    omake
+  '';
+
+  installPhase = ''
+    omake install
+  '';
+
+  meta = with lib; {
+    branch = "4.1";
+    homepage = "https://gitlab.com/camlspotter/camlimages";
+    description = "OCaml image processing library";
+    license = licenses.lgpl2;
+    maintainers = [ maintainers.vbgl ];
+  };
+}
diff --git a/pkgs/development/ocaml-modules/eigen/default.nix b/pkgs/development/ocaml-modules/eigen/default.nix
index c86b7cba010..47b002fd730 100644
--- a/pkgs/development/ocaml-modules/eigen/default.nix
+++ b/pkgs/development/ocaml-modules/eigen/default.nix
@@ -15,7 +15,7 @@ buildDunePackage rec {
 
   minimumOCamlVersion = "4.02";
 
-  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-I${libcxx}/include/c++/v1";
+  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-I${lib.getDev libcxx}/include/c++/v1";
 
   propagatedBuildInputs = [ ctypes ];
 
diff --git a/pkgs/development/ocaml-modules/llvm/default.nix b/pkgs/development/ocaml-modules/llvm/default.nix
index 34fe75a2943..f984a28869e 100644
--- a/pkgs/development/ocaml-modules/llvm/default.nix
+++ b/pkgs/development/ocaml-modules/llvm/default.nix
@@ -1,16 +1,16 @@
-{ stdenv, lib, fetchpatch, python, cmake, llvm, ocaml, findlib, ctypes }:
+{ stdenv, lib, fetchpatch, python, cmake, libllvm, ocaml, findlib, ctypes }:
 
-let version = lib.getVersion llvm; in
+let version = lib.getVersion libllvm; in
 
 stdenv.mkDerivation {
   pname = "ocaml-llvm";
   inherit version;
 
-  inherit (llvm) src;
+  inherit (libllvm) src;
 
   nativeBuildInputs = [ cmake ];
   buildInputs = [ python ocaml findlib ctypes ];
-  propagatedBuildInputs = [ llvm ];
+  propagatedBuildInputs = [ libllvm ];
 
   patches = [ (fetchpatch {
     url = "https://raw.githubusercontent.com/ocaml/opam-repository/2bdc193f5a9305ea93bf0f0dfc1fbc327c8b9306/packages/llvm/llvm.7.0.0/files/fix-shared.patch";
@@ -20,7 +20,7 @@ stdenv.mkDerivation {
   cmakeFlags = [
     "-DLLVM_OCAML_OUT_OF_TREE=TRUE"
     "-DLLVM_OCAML_INSTALL_PATH=${placeholder "out"}/ocaml"
-    "-DLLVM_OCAML_EXTERNAL_LLVM_LIBDIR=${lib.getLib llvm}/lib"
+    "-DLLVM_OCAML_EXTERNAL_LLVM_LIBDIR=${lib.getLib libllvm}/lib"
   ];
 
   buildFlags = [ "ocaml_all" ];
@@ -34,11 +34,11 @@ stdenv.mkDerivation {
   '';
 
   passthru = {
-    inherit llvm;
+    inherit libllvm;
   };
 
   meta = {
-    inherit (llvm.meta) license homepage;
+    inherit (libllvm.meta) license homepage;
     platforms = ocaml.meta.platforms or [];
     description = "OCaml bindings distributed with LLVM";
     maintainers = with lib.maintainers; [ vbgl ];
diff --git a/pkgs/development/python-modules/Babel/default.nix b/pkgs/development/python-modules/Babel/default.nix
index 1074d2eef48..183478396eb 100644
--- a/pkgs/development/python-modules/Babel/default.nix
+++ b/pkgs/development/python-modules/Babel/default.nix
@@ -1,38 +1,17 @@
-{ stdenv, lib, buildPythonPackage, fetchPypi, fetchpatch, pytz, pytest, freezegun, glibcLocales }:
+{ stdenv, lib, buildPythonPackage, fetchPypi, pytz, pytestCheckHook, freezegun }:
 
 buildPythonPackage rec {
   pname = "Babel";
-  version = "2.7.0";
+  version = "2.9.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "e86135ae101e31e2c8ec20a4e0c5220f4eed12487d5cf3f78be7e98d3a57fc28";
+    sha256 = "018yg7g2pa6vjixx1nx41cfispgfi0azzp0a1chlycbj8jsil0ys";
   };
 
-  patches = [
-    # The following 2 patches fix the test suite failing on nix < 2.3 with
-    # Python < 3 because those nix versions do not run in a pseudoterminal,
-    # which makes Python 2 not set the default encoding to UTF-8, and the
-    # Babel code crashes when printing a warning in that case.
-    # See #75676 and https://github.com/python-babel/babel/pull/691.
-    # It is important to fix this because otherwise Babel is not buildable
-    # with older nix versions (e.g. on machines used as --builders).
-    # TODO: Remove at release > 2.8.0.
-    (fetchpatch {
-      name = "Babel-Introduce-invariant-that-invalid_pofile-takes-unicode-line.patch";
-      url = "https://github.com/python-babel/babel/commit/f4f6653e6aa053724d2c6dc0ee71dcb928013352.patch";
-      sha256 = "1kyknwn9blspcf9yxmgdiaxdii1dnkblyhcflqwhxyl1mss1dxv5";
-    })
-    (fetchpatch {
-      name = "Babel-Fix-unicode-printing-error-on-Python-2-without-TTY.patch";
-      url = "https://github.com/python-babel/babel/commit/da7f31143847659b6b74d802618b03438aceb350.patch";
-      sha256 = "09yny8614knr8ngrrddmqzkxk70am135rccv2ncc6dji4xbqbfln";
-    })
-  ];
-
   propagatedBuildInputs = [ pytz ];
 
-  checkInputs = [ pytest freezegun ];
+  checkInputs = [ pytestCheckHook freezegun ];
 
   doCheck = !stdenv.isDarwin;
 
diff --git a/pkgs/development/python-modules/autobahn/default.nix b/pkgs/development/python-modules/autobahn/default.nix
index 19015a5729a..2585cd539d7 100644
--- a/pkgs/development/python-modules/autobahn/default.nix
+++ b/pkgs/development/python-modules/autobahn/default.nix
@@ -1,34 +1,78 @@
-{ lib, buildPythonPackage, fetchPypi, isPy3k,
-  six, txaio, twisted, zope_interface, cffi,
-  mock, pytest, cryptography, pynacl
+{ lib
+, argon2_cffi
+, attrs
+, buildPythonPackage
+, cbor
+, cbor2
+, cffi
+, cryptography
+, fetchPypi
+, flatbuffers
+, mock
+, msgpack
+, passlib
+, pynacl
+, pytest-asyncio
+, pytestCheckHook
+, pythonOlder
+, twisted
+, py-ubjson
+, txaio
+, ujson
+, zope_interface
 }:
+
 buildPythonPackage rec {
   pname = "autobahn";
   version = "21.3.1";
-  disabled = !isPy3k;
+  disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "e126c1f583e872fb59e79d36977cfa1f2d0a8a79f90ae31f406faae7664b8e03";
+    sha256 = "00wf9dkfgakg80gy62prg650lb8zz9y9fdlxwxcznwp8hgsw29p1";
   };
 
-  propagatedBuildInputs = [ six txaio twisted zope_interface cffi cryptography pynacl ];
+  propagatedBuildInputs = [
+    argon2_cffi
+    cbor
+    cbor2
+    cffi
+    cryptography
+    flatbuffers
+    msgpack
+    passlib
+    py-ubjson
+    pynacl
+    twisted
+    txaio
+    ujson
+    zope_interface
+  ];
+
+  checkInputs = [
+    mock
+    pytest-asyncio
+    pytestCheckHook
+  ];
 
-  checkInputs = [ mock pytest ];
-  checkPhase = ''
-    runHook preCheck
-    USE_TWISTED=true py.test $out
-    runHook postCheck
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "pytest>=2.8.6,<3.3.0" "pytest"
   '';
 
-  # Tests do no seem to be compatible yet with pytest 5.1
-  # https://github.com/crossbario/autobahn-python/issues/1235
-  doCheck = false;
+  preCheck = ''
+    # Run asyncio tests (requires twisted)
+    export USE_ASYNCIO=1
+  '';
+
+  pytestFlagsArray = [ "--pyargs autobahn" ];
+
+  pythonImportsCheck = [ "autobahn" ];
 
   meta = with lib; {
-    description = "WebSocket and WAMP in Python for Twisted and asyncio.";
-    homepage    = "https://crossbar.io/autobahn";
-    license     = licenses.mit;
+    description = "WebSocket and WAMP in Python for Twisted and asyncio";
+    homepage = "https://crossbar.io/autobahn";
+    license = licenses.mit;
     maintainers = with maintainers; [ nand0p ];
   };
 }
diff --git a/pkgs/development/python-modules/cffi/default.nix b/pkgs/development/python-modules/cffi/default.nix
index afd9cfdc295..92899ed85e5 100644
--- a/pkgs/development/python-modules/cffi/default.nix
+++ b/pkgs/development/python-modules/cffi/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, buildPythonPackage, isPyPy, fetchPypi, libffi, pycparser, pytest }:
+{ lib, stdenv, buildPythonPackage, isPyPy, fetchPypi, libffi, pycparser, pytestCheckHook }:
 
 if isPyPy then null else buildPythonPackage rec {
   pname = "cffi";
@@ -11,8 +11,9 @@ if isPyPy then null else buildPythonPackage rec {
 
   outputs = [ "out" "dev" ];
 
-  propagatedBuildInputs = [ libffi pycparser ];
-  checkInputs = [ pytest ];
+  buildInputs = [ libffi ];
+
+  propagatedBuildInputs = [ pycparser ];
 
   # On Darwin, the cffi tests want to hit libm a lot, and look for it in a global
   # impure search path. It's obnoxious how much repetition there is, and how difficult
@@ -33,9 +34,8 @@ if isPyPy then null else buildPythonPackage rec {
     "-Wno-unused-command-line-argument -Wno-unreachable-code";
 
   doCheck = !stdenv.hostPlatform.isMusl && !stdenv.isDarwin; # TODO: Investigate
-  checkPhase = ''
-    py.test -k "not test_char_pointer_conversion"
-  '';
+
+  checkInputs = [ pytestCheckHook ];
 
   meta = with lib; {
     maintainers = with maintainers; [ domenkozar lnl7 ];
diff --git a/pkgs/development/python-modules/datatable/default.nix b/pkgs/development/python-modules/datatable/default.nix
index c5271e473e3..60eb0df1d09 100644
--- a/pkgs/development/python-modules/datatable/default.nix
+++ b/pkgs/development/python-modules/datatable/default.nix
@@ -39,7 +39,7 @@ buildPythonPackage rec {
   checkInputs = [ docutils pytestCheckHook ];
 
   LLVM = llvm;
-  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-isystem ${libcxx}/include/c++/v1";
+  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-isystem ${lib.getDev libcxx}/include/c++/v1";
 
   pytestFlagsArray = let
     # ini file (not included in tarball) required to change python_files setting,
diff --git a/pkgs/development/python-modules/django/2.nix b/pkgs/development/python-modules/django/2.nix
index 991c353df17..e0d3cd12f8f 100644
--- a/pkgs/development/python-modules/django/2.nix
+++ b/pkgs/development/python-modules/django/2.nix
@@ -6,13 +6,13 @@
 
 buildPythonPackage rec {
   pname = "Django";
-  version = "2.2.20";
+  version = "2.2.22";
 
   disabled = !isPy3k;
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0r3a6gbhwngxl172yy6n0sq5knibl2vxc0wbk1g8licfbzfgjs95";
+    sha256 = "db2214db1c99017cbd971e58824e6f424375154fe358afc30e976f5b99fc6060";
   };
 
   patches = lib.optional withGdal
diff --git a/pkgs/development/python-modules/django/3.nix b/pkgs/development/python-modules/django/3.nix
index 62ca390eac5..321582946b3 100644
--- a/pkgs/development/python-modules/django/3.nix
+++ b/pkgs/development/python-modules/django/3.nix
@@ -13,13 +13,13 @@
 
 buildPythonPackage rec {
   pname = "Django";
-  version = "3.2";
+  version = "3.2.2";
 
   disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "179qdxa438fnycnnf1j5z6359h1kbp2q7djf01v5jrr26xjgkw11";
+    sha256 = "0a1d195ad65c52bf275b8277b3d49680bd1137a5f55039a806f25f6b9752ce3d";
   };
 
   patches = lib.optional withGdal
diff --git a/pkgs/development/python-modules/dnspython/1.nix b/pkgs/development/python-modules/dnspython/1.nix
index 30f280a5029..5ff02c04338 100644
--- a/pkgs/development/python-modules/dnspython/1.nix
+++ b/pkgs/development/python-modules/dnspython/1.nix
@@ -1,4 +1,8 @@
-{ buildPythonPackage, fetchPypi, lib, pythonOlder }:
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pythonOlder
+}:
 
 buildPythonPackage rec {
   pname = "dnspython";
@@ -12,11 +16,11 @@ buildPythonPackage rec {
 
   # needs networking for some tests
   doCheck = false;
+  pythonImportsCheck = [ "dns" ];
 
-  meta = {
-    description = "A DNS toolkit for Python 3.x";
+  meta = with lib; {
+    description = "A DNS toolkit for Python";
     homepage = "http://www.dnspython.org";
-    # BSD-like, check https://www.dnspython.org/LICENSE for details
-    license = lib.licenses.free;
+    license = with licenses; [ isc ];
   };
 }
diff --git a/pkgs/development/python-modules/dnspython/default.nix b/pkgs/development/python-modules/dnspython/default.nix
index afb85fb61f5..56e69aac044 100644
--- a/pkgs/development/python-modules/dnspython/default.nix
+++ b/pkgs/development/python-modules/dnspython/default.nix
@@ -1,4 +1,8 @@
-{ buildPythonPackage, fetchPypi, lib, pythonOlder }:
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pythonOlder
+}:
 
 buildPythonPackage rec {
   pname = "dnspython";
@@ -13,11 +17,11 @@ buildPythonPackage rec {
 
   # needs networking for some tests
   doCheck = false;
+  pythonImportsCheck = [ "dns" ];
 
-  meta = {
-    description = "A DNS toolkit for Python 3.x";
+  meta = with lib; {
+    description = "A DNS toolkit for Python";
     homepage = "http://www.dnspython.org";
-    # BSD-like, check https://www.dnspython.org/LICENSE for details
-    license = lib.licenses.free;
+    license = with licenses; [ isc ];
   };
 }
diff --git a/pkgs/development/python-modules/dotmap/default.nix b/pkgs/development/python-modules/dotmap/default.nix
new file mode 100644
index 00000000000..cb5f032a6f2
--- /dev/null
+++ b/pkgs/development/python-modules/dotmap/default.nix
@@ -0,0 +1,30 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "dotmap";
+  version = "1.3.23";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0hy88kzzb7zhxfr7iyvl6rhmvz02538pbna7zypaard4a88bbbka";
+  };
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pytestFlagsArray = [ "dotmap/test.py" ];
+
+  pythonImportsCheck = [ "dotmap" ];
+
+  meta = with lib; {
+    description = "Python for dot-access dictionaries";
+    homepage = "https://github.com/drgrib/dotmap";
+    license = with licenses; [ mit ];
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/development/python-modules/enaml/default.nix b/pkgs/development/python-modules/enaml/default.nix
index 1102443884f..8896c5c706a 100644
--- a/pkgs/development/python-modules/enaml/default.nix
+++ b/pkgs/development/python-modules/enaml/default.nix
@@ -5,7 +5,7 @@
 , ply
 , kiwisolver
 , qtpy
-, sip
+, sip_4
 , cppy
 , bytecode
 }:
@@ -44,7 +44,7 @@ buildPythonPackage rec {
     ply
     kiwisolver
     qtpy
-    sip
+    sip_4
     cppy
     bytecode
   ];
diff --git a/pkgs/development/python-modules/flask-appbuilder/default.nix b/pkgs/development/python-modules/flask-appbuilder/default.nix
index 6e98f6e80ac..e2c077162b1 100644
--- a/pkgs/development/python-modules/flask-appbuilder/default.nix
+++ b/pkgs/development/python-modules/flask-appbuilder/default.nix
@@ -6,6 +6,7 @@
 , colorama
 , click
 , email_validator
+, fetchpatch
 , flask
 , flask-babel
 , flask_login
@@ -20,21 +21,27 @@
 , python-dateutil
 , prison
 , pyjwt
+, pyyaml
 , sqlalchemy-utils
 }:
 
 buildPythonPackage rec {
   pname = "flask-appbuilder";
-  version = "3.1.1";
+  version = "3.2.3";
 
   src = fetchPypi {
     pname = "Flask-AppBuilder";
     inherit version;
-    sha256 = "076b020b0ba125339a2e710e74eab52648cde2b18599f7cb0fa1eada9bbb648c";
+    sha256 = "sha256-+ZYrn2LnVORyYsnZtsH3JX+4XbGgAZZ/Eh6O5gUP+y4=";
   };
 
-  checkInputs = [
-    nose
+  patches = [
+    (fetchpatch {
+      name = "flask_jwt_extended-and-pyjwt-patch";
+      url = "https://github.com/dpgaspar/Flask-AppBuilder/commit/7097a7b133f27c78d2b54d2a46e4a4c24478a066.patch";
+      sha256 = "sha256-ZpY8+2Hoz3z01GVtw2OIbQcsmAwa7iwilFWzgcGhY1w=";
+      includes = [ "flask_appbuilder/security/manager.py" "setup.py" ];
+    })
   ];
 
   propagatedBuildInputs = [
@@ -56,22 +63,23 @@ buildPythonPackage rec {
     python-dateutil
     prison
     pyjwt
+    pyyaml
     sqlalchemy-utils
   ];
 
   postPatch = ''
     substituteInPlace setup.py \
-      --replace "apispec[yaml]>=3.3, <4" "apispec" \
-      --replace "Flask-Login>=0.3, <0.5" "Flask-Login" \
-      --replace "Flask-Babel>=1, <2" "Flask-Babel" \
-      --replace "marshmallow-sqlalchemy>=0.22.0, <0.24.0" "marshmallow-sqlalchemy" \
-      --replace "prison>=0.1.3, <1.0.0" "prison"
+      --replace "apispec[yaml]>=3.3, <4" "apispec[yaml] >=3.3, <5" \
+      --replace "Flask-Login>=0.3, <0.5" "Flask-Login >=0.3, <0.6" \
+      --replace "Flask-Babel>=1, <2" "Flask-Babel >=1, <3" \
+      --replace "marshmallow-sqlalchemy>=0.22.0, <0.24.0" "marshmallow-sqlalchemy >=0.22.0, <0.25.0"
   '';
 
-
   # majority of tests require network access or mongo
   doCheck = false;
 
+  pythonImportsCheck = [ "flask_appbuilder" ];
+
   meta = with lib; {
     description = "Simple and rapid application development framework, built on top of Flask";
     homepage = "https://github.com/dpgaspar/flask-appbuilder/";
diff --git a/pkgs/development/python-modules/gst-python/default.nix b/pkgs/development/python-modules/gst-python/default.nix
index ea89f7214c6..a391d993cf0 100644
--- a/pkgs/development/python-modules/gst-python/default.nix
+++ b/pkgs/development/python-modules/gst-python/default.nix
@@ -14,7 +14,7 @@
 
 buildPythonPackage rec {
   pname = "gst-python";
-  version = "1.18.0";
+  version = "1.18.4";
 
   format = "other";
 
@@ -22,7 +22,7 @@ buildPythonPackage rec {
 
   src = fetchurl {
     url = "${meta.homepage}/src/gst-python/${pname}-${version}.tar.xz";
-    sha256 = "0ifx2s2j24sj2w5jm7cxyg1kinnhbxiz4x0qp3gnsjlwbawfigvn";
+    sha256 = "13h9qzfz8s1gyj2ar9q2gf5346sgdv6jv8hj7aw0hpl2gs5f0s6b";
   };
 
   # Python 2.x is not supported.
diff --git a/pkgs/development/python-modules/hyperlink/default.nix b/pkgs/development/python-modules/hyperlink/default.nix
index ad56de86782..21927683b18 100644
--- a/pkgs/development/python-modules/hyperlink/default.nix
+++ b/pkgs/development/python-modules/hyperlink/default.nix
@@ -1,4 +1,10 @@
-{ lib, buildPythonPackage, fetchPypi, isPy27, idna, typing ? null }:
+{ lib
+, buildPythonPackage
+, fetchPypi
+, isPy27
+, idna
+, typing ? null
+}:
 
 buildPythonPackage rec {
   pname = "hyperlink";
@@ -6,7 +12,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "427af957daa58bc909471c6c40f74c5450fa123dd093fc53efd2e91d2705a56b";
+    sha256 = "0sx50lkivsfjxx9zr4yh7l9gll2l9kvl0v0w8w4wk2x5v9bzjyj2";
   };
 
   propagatedBuildInputs = [ idna ]
@@ -14,6 +20,7 @@ buildPythonPackage rec {
 
   meta = with lib; {
     description = "A featureful, correct URL for Python";
+    homepage = "https://github.com/python-hyper/hyperlink";
     license = licenses.mit;
     platforms = platforms.all;
     maintainers = with maintainers; [ apeschar ];
diff --git a/pkgs/development/python-modules/iso8601/default.nix b/pkgs/development/python-modules/iso8601/default.nix
index 783f6f1eb30..d0a74f400bb 100644
--- a/pkgs/development/python-modules/iso8601/default.nix
+++ b/pkgs/development/python-modules/iso8601/default.nix
@@ -1,7 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchPypi
-, pytest
+, pytestCheckHook
 }:
 
 buildPythonPackage rec {
@@ -13,15 +13,18 @@ buildPythonPackage rec {
     sha256 = "8aafd56fa0290496c5edbb13c311f78fa3a241f0853540da09d9363eae3ebd79";
   };
 
-  checkInputs = [ pytest ];
+  checkInputs = [
+    pytestCheckHook
+  ];
 
-  checkPhase = ''
-    py.test iso8601
-  '';
+  pytestFlagsArray = [ "iso8601" ];
 
-  meta = {
-    homepage = "https://bitbucket.org/micktwomey/pyiso8601/";
+  pythonImportsCheck = [ "iso8601" ];
+
+  meta = with lib; {
     description = "Simple module to parse ISO 8601 dates";
-    maintainers = with lib.maintainers; [ phreedom ];
+    homepage = "https://pyiso8601.readthedocs.io/";
+    license = with licenses; [ mit ];
+    maintainers = with maintainers; [ fab ];
   };
 }
diff --git a/pkgs/development/python-modules/johnnycanencrypt/default.nix b/pkgs/development/python-modules/johnnycanencrypt/default.nix
index 460b0cddf61..d2d4719dab4 100644
--- a/pkgs/development/python-modules/johnnycanencrypt/default.nix
+++ b/pkgs/development/python-modules/johnnycanencrypt/default.nix
@@ -39,7 +39,7 @@ buildPythonPackage rec {
 
   cargoSha256 = "0ifvpdizcdp2c5x2x2j1bhhy5a75q0pk7a63dmh52mlpmh45fy6r";
 
-  LIBCLANG_PATH = llvmPackages.libclang + "/lib";
+  LIBCLANG_PATH = "${llvmPackages.libclang.lib}/lib";
 
   propagatedBuildInputs = [
     requests
diff --git a/pkgs/development/python-modules/kiwisolver/1_1.nix b/pkgs/development/python-modules/kiwisolver/1_1.nix
index 0702e3518e0..762b5bc0b7b 100644
--- a/pkgs/development/python-modules/kiwisolver/1_1.nix
+++ b/pkgs/development/python-modules/kiwisolver/1_1.nix
@@ -14,7 +14,7 @@ buildPythonPackage rec {
     sha256 = "53eaed412477c836e1b9522c19858a8557d6e595077830146182225613b11a75";
   };
 
-  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-I${libcxx}/include/c++/v1";
+  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-I${lib.getDev libcxx}/include/c++/v1";
 
   # Does not include tests
   doCheck = false;
diff --git a/pkgs/development/python-modules/kiwisolver/default.nix b/pkgs/development/python-modules/kiwisolver/default.nix
index d4d62787092..2b157494f91 100644
--- a/pkgs/development/python-modules/kiwisolver/default.nix
+++ b/pkgs/development/python-modules/kiwisolver/default.nix
@@ -15,7 +15,7 @@ buildPythonPackage rec {
     sha256 = "950a199911a8d94683a6b10321f9345d5a3a8433ec58b217ace979e18f16e248";
   };
 
-  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-I${libcxx}/include/c++/v1";
+  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-I${lib.getDev libcxx}/include/c++/v1";
 
   nativeBuildInputs = [
     cppy
diff --git a/pkgs/development/python-modules/libarcus/default.nix b/pkgs/development/python-modules/libarcus/default.nix
index edea85876a8..a48d70c544c 100644
--- a/pkgs/development/python-modules/libarcus/default.nix
+++ b/pkgs/development/python-modules/libarcus/default.nix
@@ -1,5 +1,5 @@
 { lib, buildPythonPackage, python, fetchFromGitHub
-, cmake, sip, protobuf, pythonOlder }:
+, cmake, sip_4, protobuf, pythonOlder }:
 
 buildPythonPackage rec {
   pname = "libarcus";
@@ -15,7 +15,7 @@ buildPythonPackage rec {
 
   disabled = pythonOlder "3.4.0";
 
-  propagatedBuildInputs = [ sip ];
+  propagatedBuildInputs = [ sip_4 ];
   nativeBuildInputs = [ cmake ];
   buildInputs = [ protobuf ];
 
diff --git a/pkgs/development/python-modules/libsavitar/default.nix b/pkgs/development/python-modules/libsavitar/default.nix
index f6aa1b378f5..7ecd09160ff 100644
--- a/pkgs/development/python-modules/libsavitar/default.nix
+++ b/pkgs/development/python-modules/libsavitar/default.nix
@@ -1,4 +1,4 @@
-{ lib, buildPythonPackage, python, pythonOlder, fetchFromGitHub, cmake, sip }:
+{ lib, buildPythonPackage, python, pythonOlder, fetchFromGitHub, cmake, sip_4 }:
 
 buildPythonPackage rec {
   pname = "libsavitar";
@@ -18,7 +18,7 @@ buildPythonPackage rec {
 
   nativeBuildInputs = [ cmake ];
 
-  propagatedBuildInputs = [ sip ];
+  propagatedBuildInputs = [ sip_4 ];
 
   disabled = pythonOlder "3.4.0";
 
diff --git a/pkgs/development/python-modules/llvmlite/default.nix b/pkgs/development/python-modules/llvmlite/default.nix
index b5e6847a9f0..c7d2221a22e 100644
--- a/pkgs/development/python-modules/llvmlite/default.nix
+++ b/pkgs/development/python-modules/llvmlite/default.nix
@@ -33,7 +33,7 @@ buildPythonPackage rec {
   '';
   # Set directory containing llvm-config binary
   preConfigure = ''
-    export LLVM_CONFIG=${llvm}/bin/llvm-config
+    export LLVM_CONFIG=${llvm.dev}/bin/llvm-config
   '';
   checkPhase = ''
     ${python.executable} runtests.py
diff --git a/pkgs/development/python-modules/matplotlib/2.nix b/pkgs/development/python-modules/matplotlib/2.nix
index 2c929d9a694..a6ee1a3bade 100644
--- a/pkgs/development/python-modules/matplotlib/2.nix
+++ b/pkgs/development/python-modules/matplotlib/2.nix
@@ -1,24 +1,16 @@
-{ lib, stdenv, fetchPypi, python, buildPythonPackage, pycairo, backports_functools_lru_cache
+{ lib, stdenv, fetchPypi, writeText, python, buildPythonPackage, pycairo, backports_functools_lru_cache
 , which, cycler, dateutil, nose, numpy, pyparsing, sphinx, tornado, kiwisolver
 , freetype, libpng, pkg-config, mock, pytz, pygobject3, gobject-introspection, functools32, subprocess32
 , fetchpatch
-, enableGhostscript ? false, ghostscript ? null, gtk3
+, enableGhostscript ? false, ghostscript, gtk3
 , enableGtk3 ? false, cairo
 # darwin has its own "MacOSX" backend
-, enableTk ? !stdenv.isDarwin, tcl ? null, tk ? null, tkinter ? null, libX11 ? null
+, enableTk ? !stdenv.isDarwin, tcl, tk, tkinter, libX11
 , enableQt ? false, pyqt4
 , Cocoa
 , pythonOlder
 }:
 
-assert enableGhostscript -> ghostscript != null;
-assert enableTk -> (tcl != null)
-                && (tk != null)
-                && (tkinter != null)
-                && (libX11 != null)
-                ;
-assert enableQt -> pyqt4 != null;
-
 buildPythonPackage rec {
   version = "2.2.3";
   pname = "matplotlib";
@@ -54,7 +46,10 @@ buildPythonPackage rec {
     ++ lib.optionals enableQt [ pyqt4 ]
     ++ lib.optionals python.isPy2 [ functools32 subprocess32 ];
 
-  setup_cfg = ./setup.cfg;
+  passthru.config = {
+    directories = { basedirlist = "."; };
+  };
+  setup_cfg = writeText "setup.cfg" (lib.generators.toINI {} passthru.config);
   preBuild = ''
     cp "$setup_cfg" ./setup.cfg
   '';
diff --git a/pkgs/development/python-modules/matplotlib/default.nix b/pkgs/development/python-modules/matplotlib/default.nix
index 4be4189f8c7..7364920cba2 100644
--- a/pkgs/development/python-modules/matplotlib/default.nix
+++ b/pkgs/development/python-modules/matplotlib/default.nix
@@ -1,33 +1,25 @@
-{ lib, stdenv, fetchPypi, python, buildPythonPackage, isPy3k, pycairo, backports_functools_lru_cache
+{ lib, stdenv, fetchPypi, writeText, python, buildPythonPackage, isPy3k, pycairo, backports_functools_lru_cache
 , which, cycler, dateutil, nose, numpy, pyparsing, sphinx, tornado, kiwisolver
-, freetype, libpng, pkg-config, mock, pytz, pygobject3, gobject-introspection
+, freetype, qhull, libpng, pkg-config, mock, pytz, pygobject3, gobject-introspection
 , certifi, pillow
-, enableGhostscript ? true, ghostscript ? null, gtk3
+, enableGhostscript ? true, ghostscript, gtk3
 , enableGtk3 ? false, cairo
 # darwin has its own "MacOSX" backend
-, enableTk ? !stdenv.isDarwin, tcl ? null, tk ? null, tkinter ? null, libX11 ? null
-, enableQt ? false, pyqt5 ? null
+, enableTk ? !stdenv.isDarwin, tcl, tk, tkinter, libX11
+, enableQt ? false, pyqt5
 , Cocoa
 , pythonOlder
 }:
 
-assert enableGhostscript -> ghostscript != null;
-assert enableTk -> (tcl != null)
-                && (tk != null)
-                && (tkinter != null)
-                && (libX11 != null)
-                ;
-assert enableQt -> pyqt5 != null;
-
 buildPythonPackage rec {
-  version = "3.3.4";
+  version = "3.4.1";
   pname = "matplotlib";
 
   disabled = !isPy3k;
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "3e477db76c22929e4c6876c44f88d790aacdf3c3f8f3a90cb1975c0bf37825b0";
+    sha256 = "84d4c4f650f356678a5d658a43ca21a41fca13f9b8b00169c0b76e6a6a948908";
   };
 
   XDG_RUNTIME_DIR = "/tmp";
@@ -39,13 +31,23 @@ buildPythonPackage rec {
     ++ lib.optional stdenv.isDarwin [ Cocoa ];
 
   propagatedBuildInputs =
-    [ cycler dateutil numpy pyparsing tornado freetype kiwisolver
-      certifi libpng mock pytz pillow ]
+    [ cycler dateutil numpy pyparsing tornado freetype qhull
+      kiwisolver certifi libpng mock pytz pillow ]
     ++ lib.optionals enableGtk3 [ cairo pycairo gtk3 gobject-introspection pygobject3 ]
     ++ lib.optionals enableTk [ tcl tk tkinter libX11 ]
     ++ lib.optionals enableQt [ pyqt5 ];
 
-  setup_cfg = if stdenv.isDarwin then ./setup-darwin.cfg else ./setup.cfg;
+  passthru.config = {
+    directories = { basedirlist = "."; };
+    libs = {
+      system_freetype = true;
+      system_qhull = true;
+    } // lib.optionalAttrs stdenv.isDarwin {
+      # LTO not working in darwin stdenv, see #19312
+      enable_lto = false;
+    };
+  };
+  setup_cfg = writeText "setup.cfg" (lib.generators.toINI {} passthru.config);
   preBuild = ''
     cp "$setup_cfg" ./setup.cfg
   '';
diff --git a/pkgs/development/python-modules/matplotlib/setup-darwin.cfg b/pkgs/development/python-modules/matplotlib/setup-darwin.cfg
deleted file mode 100644
index f6463d9c574..00000000000
--- a/pkgs/development/python-modules/matplotlib/setup-darwin.cfg
+++ /dev/null
@@ -1,7 +0,0 @@
-[directories]
-basedirlist = .
-
-[libs]
-system_freetype = true
-# LTO not working in darwin stdenv, see #19312
-enable_lto = false
diff --git a/pkgs/development/python-modules/matplotlib/setup.cfg b/pkgs/development/python-modules/matplotlib/setup.cfg
deleted file mode 100644
index 6a773862765..00000000000
--- a/pkgs/development/python-modules/matplotlib/setup.cfg
+++ /dev/null
@@ -1,5 +0,0 @@
-[directories]
-basedirlist = .
-
-[libs]
-system_freetype = true
diff --git a/pkgs/development/python-modules/meshtastic/default.nix b/pkgs/development/python-modules/meshtastic/default.nix
new file mode 100644
index 00000000000..c8a9d78e7c1
--- /dev/null
+++ b/pkgs/development/python-modules/meshtastic/default.nix
@@ -0,0 +1,57 @@
+{ lib
+, buildPythonPackage
+, dotmap
+, fetchPypi
+, pexpect
+, protobuf
+, pygatt
+, pypubsub
+, pyqrcode
+, pyserial
+, pythonOlder
+, tabulate
+, timeago
+}:
+
+buildPythonPackage rec {
+  pname = "meshtastic";
+  version = "1.2.30";
+  disabled = pythonOlder "3.6";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1kjflc2jwnsgxyr2zx1gyykhak9fsgy6hxaxlggsz5sw9b8rdrby";
+  };
+
+  propagatedBuildInputs = [
+    dotmap
+    pexpect
+    protobuf
+    pygatt
+    pypubsub
+    pyqrcode
+    pyserial
+    tabulate
+    timeago
+  ];
+
+  postPatch = ''
+    # https://github.com/meshtastic/Meshtastic-python/pull/87
+    substituteInPlace setup.py \
+      --replace 'with open("README.md", "r") as fh:' "" \
+      --replace "long_description = fh.read()" "" \
+      --replace "long_description=long_description," 'long_description="",'
+  '';
+
+  # Project only provides PyPI releases which don't contain the tests
+  # https://github.com/meshtastic/Meshtastic-python/issues/86
+  doCheck = false;
+  pythonImportsCheck = [ "meshtastic" ];
+
+  meta = with lib; {
+    description = "Python API for talking to Meshtastic devices";
+    homepage = "https://meshtastic.github.io/Meshtastic-python/";
+    license = with licenses; [ asl20 ];
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/development/python-modules/numba/default.nix b/pkgs/development/python-modules/numba/default.nix
index 211e9d6185f..c49a4105abe 100644
--- a/pkgs/development/python-modules/numba/default.nix
+++ b/pkgs/development/python-modules/numba/default.nix
@@ -22,7 +22,7 @@ buildPythonPackage rec {
     sha256 = "55c11d7edbba2ba715f2b56f5294cad55cfd87bff98e2627c3047c2d5cc52d16";
   };
 
-  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-I${libcxx}/include/c++/v1";
+  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-I${lib.getDev libcxx}/include/c++/v1";
 
   propagatedBuildInputs = [ numpy llvmlite setuptools ];
   pythonImportsCheck = [ "numba" ];
diff --git a/pkgs/development/python-modules/pandas/2.nix b/pkgs/development/python-modules/pandas/2.nix
index 936a3db296e..8af4094b0cf 100644
--- a/pkgs/development/python-modules/pandas/2.nix
+++ b/pkgs/development/python-modules/pandas/2.nix
@@ -59,7 +59,7 @@ buildPythonPackage rec {
   # For OSX, we need to add a dependency on libcxx, which provides
   # `complex.h` and other libraries that pandas depends on to build.
   postPatch = lib.optionalString stdenv.isDarwin ''
-    cpp_sdk="${libcxx}/include/c++/v1";
+    cpp_sdk="${lib.getDev libcxx}/include/c++/v1";
     echo "Adding $cpp_sdk to the setup.py common_include variable"
     substituteInPlace setup.py \
       --replace "['pandas/src/klib', 'pandas/src']" \
diff --git a/pkgs/development/python-modules/pandas/default.nix b/pkgs/development/python-modules/pandas/default.nix
index 7fd551e192c..f3505e3c9a6 100644
--- a/pkgs/development/python-modules/pandas/default.nix
+++ b/pkgs/development/python-modules/pandas/default.nix
@@ -77,7 +77,7 @@ buildPythonPackage rec {
   # For OSX, we need to add a dependency on libcxx, which provides
   # `complex.h` and other libraries that pandas depends on to build.
   postPatch = lib.optionalString stdenv.isDarwin ''
-    cpp_sdk="${libcxx}/include/c++/v1";
+    cpp_sdk="${lib.getDev libcxx}/include/c++/v1";
     echo "Adding $cpp_sdk to the setup.py common_include variable"
     substituteInPlace setup.py \
       --replace "['pandas/src/klib', 'pandas/src']" \
diff --git a/pkgs/development/python-modules/poppler-qt5/default.nix b/pkgs/development/python-modules/poppler-qt5/default.nix
index 94d86f7b713..4a9fdfa4262 100644
--- a/pkgs/development/python-modules/poppler-qt5/default.nix
+++ b/pkgs/development/python-modules/poppler-qt5/default.nix
@@ -4,7 +4,7 @@
 , isPy3k
 , fetchPypi
 , pythonPackages
-, sip_5
+, sip
 , qtbase
 , qmake
 , pyqt5
@@ -34,7 +34,7 @@ buildPythonPackage rec {
   ];
 
   buildInputs = [ qtbase.dev poppler pyqt-builder ];
-  nativeBuildInputs = [ pkg-config qmake sip_5 ];
+  nativeBuildInputs = [ pkg-config qmake sip ];
   propagatedBuildInputs = [ pyqt5.dev ];
 
   format = "pyproject";
@@ -46,7 +46,7 @@ buildPythonPackage rec {
 
     [tool.sip.bindings.Poppler-Qt5]
     include-dirs = ["${poppler.dev}/include/poppler"]
-    tags = ["${sip_5.platform_tag}"]
+    tags = ["${sip.platform_tag}"]
     EOF
   '';
 
diff --git a/pkgs/development/python-modules/prison/default.nix b/pkgs/development/python-modules/prison/default.nix
index 941da2bf9af..95a79ea1896 100644
--- a/pkgs/development/python-modules/prison/default.nix
+++ b/pkgs/development/python-modules/prison/default.nix
@@ -7,13 +7,13 @@
 
 buildPythonPackage rec {
   pname = "prison";
-  version = "0.1.2";
+  version = "0.1.3";
 
   src = fetchFromGitHub {
     owner = "betodealmeida";
     repo = "python-rison";
     rev = version;
-    sha256 = "14vb468iznf9416z993bbqihywp9ibyslw5vp67wfr200zyxjwak";
+    sha256 = "sha256-qor40vUQeTdlO3vwug3GGNX5vkNaF0H7EWlRdsY4bvc=";
   };
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/python-modules/py-cpuinfo/default.nix b/pkgs/development/python-modules/py-cpuinfo/default.nix
index f9e276b3bb5..12b9668f1ed 100644
--- a/pkgs/development/python-modules/py-cpuinfo/default.nix
+++ b/pkgs/development/python-modules/py-cpuinfo/default.nix
@@ -1,7 +1,6 @@
 { lib
 , stdenv
 , fetchFromGitHub
-, fetchpatch
 , buildPythonPackage
 , pytestCheckHook
 , sysctl
@@ -9,28 +8,15 @@
 
 buildPythonPackage rec {
   pname = "py-cpuinfo";
-  version = "7.0.0";
+  version = "8.0.0";
 
   src = fetchFromGitHub {
      owner = "workhorsy";
      repo = pname;
      rev = "v${version}";
-     sha256 = "10qfaibyb2syiwiyv74l7d97vnmlk079qirgnw3ncklqjs0s3gbi";
+     sha256 = "sha256-Mgzj1HTasUNHeHMVwV6d+TeyVqnBNUwCJ1EC3kfovf8=";
   };
 
-  patches = [
-    # Make it detect Apple Silicon, remove after https://github.com/workhorsy/py-cpuinfo/pull/161 is merged.
-    (fetchpatch {
-      url = "https://github.com/workhorsy/py-cpuinfo/commit/54c32da6678f9d75ec5acf4534056cdc85c2a04d.patch";
-      sha256 = "sha256-3R46KrpACAQ1V0CQtz48V5mQXxvplUQrXnACtiE8WqY=";
-    })
-    # Continuation of the patch above
-    (fetchpatch {
-      url = "https://github.com/workhorsy/py-cpuinfo/commit/0d00f4b99750f292c85ff23e1039ea9489cb7ec8.patch";
-      sha256 = "sha256-mHoXoCAEG2v3xpQppRFWzSvhYCp5i9CZkbEgtiLVzMs=";
-    })
-  ];
-
   checkInputs = [
     pytestCheckHook
   ];
@@ -42,17 +28,19 @@ buildPythonPackage rec {
       --replace "_run_and_get_stdout(['sysctl'" "_run_and_get_stdout(['${sysctl}/bin/sysctl'"
   '';
 
-  meta = {
-    description = "Get CPU info with pure Python 2 & 3";
+  pythonImportsCheck = [ "cpuinfo" ];
+
+  meta = with lib; {
+    description = "Get CPU info with pure Python";
     longDescription = ''
       Py-cpuinfo gets CPU info with pure Python and should work without any
       extra programs or libraries, beyond what your OS provides. It does not
       require any compilation (C/C++, assembly, etc.) to use and works with
-      Python 2 and 3.
+      Python.
     '';
-    inherit (src.meta) homepage;
+    homepage = "https://github.com/workhorsy/py-cpuinfo";
     changelog = "https://github.com/workhorsy/py-cpuinfo/blob/v${version}/ChangeLog";
-    license = lib.licenses.mit;
-    maintainers = with lib.maintainers; [ costrouc ];
+    license = licenses.mit;
+    maintainers = with maintainers; [ costrouc ];
   };
 }
diff --git a/pkgs/development/python-modules/py-ubjson/default.nix b/pkgs/development/python-modules/py-ubjson/default.nix
new file mode 100644
index 00000000000..4efa2b8b6fd
--- /dev/null
+++ b/pkgs/development/python-modules/py-ubjson/default.nix
@@ -0,0 +1,32 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "py-ubjson";
+  version = "0.16.1";
+
+  src = fetchFromGitHub {
+    owner = "Iotic-Labs";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1frn97xfa88zrfmpnvdk1pc03yihlchhph99bhjayvzlfcrhm5v3";
+  };
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pytestFlagsArray = [ "test/test.py" ];
+
+  pythonImportsCheck = [ "ubjson" ];
+
+  meta = with lib; {
+    description = "Universal Binary JSON draft-12 serializer for Python";
+    homepage = "https://github.com/Iotic-Labs/py-ubjson";
+    license = with licenses; [ asl20 ];
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/development/python-modules/py3exiv2/default.nix b/pkgs/development/python-modules/py3exiv2/default.nix
index 236a38c7e69..59d0cdb7299 100644
--- a/pkgs/development/python-modules/py3exiv2/default.nix
+++ b/pkgs/development/python-modules/py3exiv2/default.nix
@@ -13,7 +13,7 @@ buildPythonPackage rec {
   buildInputs = [ exiv2 boost ];
 
   # work around python distutils compiling C++ with $CC (see issue #26709)
-  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-I${libcxx}/include/c++/v1";
+  NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-I${lib.getDev libcxx}/include/c++/v1";
 
   meta = with lib; {
     homepage = "https://launchpad.net/py3exiv2";
diff --git a/pkgs/development/python-modules/pycurl/default.nix b/pkgs/development/python-modules/pycurl/default.nix
index fe62d1be1ea..e202d1928f2 100644
--- a/pkgs/development/python-modules/pycurl/default.nix
+++ b/pkgs/development/python-modules/pycurl/default.nix
@@ -1,11 +1,12 @@
-{ buildPythonPackage
+{ lib
+, buildPythonPackage
 , isPyPy
 , fetchPypi
 , pythonOlder
 , curl
 , openssl
 , bottle
-, pytest
+, pytestCheckHook
 , nose
 , flaky
 }:
@@ -20,6 +21,11 @@ buildPythonPackage rec {
     sha256 = "8301518689daefa53726b59ded6b48f33751c383cf987b0ccfbbc4ed40281325";
   };
 
+  preConfigure = ''
+    substituteInPlace setup.py --replace '--static-libs' '--libs'
+    export PYCURL_SSL_LIBRARY=openssl
+  '';
+
   buildInputs = [
     curl
     openssl.out
@@ -31,34 +37,48 @@ buildPythonPackage rec {
 
   checkInputs = [
     bottle
-    pytest
+    pytestCheckHook
     nose
     flaky
   ];
 
-  # skip impure or flakey tests
-  # See also:
-  #   * https://github.com/NixOS/nixpkgs/issues/77304
-  checkPhase = ''
-    HOME=$TMPDIR pytest tests -k "not test_ssl_in_static_libs \
-                     and not test_keyfunction \
-                     and not test_keyfunction_bogus_return \
-                     and not test_libcurl_ssl_gnutls \
-                     and not test_libcurl_ssl_nss \
-                     and not test_libcurl_ssl_openssl" \
-                 --ignore=tests/getinfo_test.py \
-                 --ignore=tests/memory_mgmt_test.py \
-                 --ignore=tests/multi_memory_mgmt_test.py \
-                 --ignore=tests/multi_timer_test.py
-  '';
+  pytestFlagsArray = [
+    # don't pick up the tests directory below examples/
+    "tests"
+  ];
 
-  preConfigure = ''
-    substituteInPlace setup.py --replace '--static-libs' '--libs'
-    export PYCURL_SSL_LIBRARY=openssl
+  preCheck = ''
+    export HOME=$TMPDIR
   '';
 
-  meta = {
+  disabledTests = [
+    # libcurl stopped passing the reason phrase from the HTTP status line
+    # https://github.com/pycurl/pycurl/issues/679
+    "test_failonerror"
+    "test_failonerror_status_line_invalid_utf8_python3"
+    # bottle>=0.12.17 escapes utf8 properly, so these test don't work anymore
+    # https://github.com/pycurl/pycurl/issues/669
+    "test_getinfo_content_type_invalid_utf8_python3"
+    "test_getinfo_cookie_invalid_utf8_python3"
+    "test_getinfo_raw_content_type_invalid_utf8"
+    "test_getinfo_raw_cookie_invalid_utf8"
+    # tests that require network access
+    "test_keyfunction"
+    "test_keyfunction_bogus_return"
+    # OSError: tests/fake-curl/libcurl/with_openssl.so: cannot open shared object file: No such file or directory
+    "test_libcurl_ssl_openssl"
+    # OSError: tests/fake-curl/libcurl/with_nss.so: cannot open shared object file: No such file or directory
+    "test_libcurl_ssl_nss"
+    # OSError: tests/fake-curl/libcurl/with_gnutls.so: cannot open shared object file: No such file or directory
+    "test_libcurl_ssl_gnutls"
+    # AssertionError: assert 'crypto' in ['curl']
+    "test_ssl_in_static_libs"
+  ];
+
+  meta = with lib; {
     homepage = "http://pycurl.sourceforge.net/";
     description = "Python wrapper for libcurl";
+    license = licenses.lgpl2Only;
+    maintainers = with maintainers; [];
   };
 }
diff --git a/pkgs/development/python-modules/pygatt/default.nix b/pkgs/development/python-modules/pygatt/default.nix
new file mode 100644
index 00000000000..9d596e17236
--- /dev/null
+++ b/pkgs/development/python-modules/pygatt/default.nix
@@ -0,0 +1,48 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, mock
+, nose
+, pexpect
+, pyserial
+, pytestCheckHook
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "pygatt";
+  version = "4.0.5";
+  disabled = pythonOlder "3.5";
+
+  src = fetchFromGitHub {
+    owner = "peplin";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1zdfxidiw0l8n498sy0l33n90lz49n25x889cx6jamjr7frlcihd";
+  };
+
+  propagatedBuildInputs = [
+    pexpect
+    pyserial
+  ];
+
+  checkInputs = [
+    mock
+    nose
+    pytestCheckHook
+  ];
+
+  postPatch = ''
+    # Not support for Python < 3.4
+    substituteInPlace setup.py --replace "'enum-compat'" ""
+  '';
+
+  pythonImportsCheck = [ "pygatt" ];
+
+  meta = with lib; {
+    description = "Python wrapper the BGAPI for accessing Bluetooth LE Devices";
+    homepage = "https://github.com/peplin/pygatt";
+    license = with licenses; [ asl20 mit ];
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/development/python-modules/pykdl/default.nix b/pkgs/development/python-modules/pykdl/default.nix
index 674a43f5f3e..9a0431b2b85 100644
--- a/pkgs/development/python-modules/pykdl/default.nix
+++ b/pkgs/development/python-modules/pykdl/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, toPythonModule, fetchpatch, cmake, orocos-kdl, python, sip }:
+{ lib, stdenv, toPythonModule, fetchpatch, cmake, orocos-kdl, python, sip_4 }:
 
 toPythonModule (stdenv.mkDerivation {
   pname = "pykdl";
@@ -18,7 +18,7 @@ toPythonModule (stdenv.mkDerivation {
 
   nativeBuildInputs = [ cmake ];
   buildInputs = [ orocos-kdl ];
-  propagatedBuildInputs = [ python sip ];
+  propagatedBuildInputs = [ python sip_4 ];
 
   meta = with lib; {
     description = "Kinematics and Dynamics Library (Python bindings)";
diff --git a/pkgs/development/python-modules/pynest2d/default.nix b/pkgs/development/python-modules/pynest2d/default.nix
index 7ca72293382..f3b5b9ba685 100644
--- a/pkgs/development/python-modules/pynest2d/default.nix
+++ b/pkgs/development/python-modules/pynest2d/default.nix
@@ -1,5 +1,5 @@
 { lib, buildPythonPackage, fetchFromGitHub, python3, cmake
-, pythonOlder, libnest2d, sip, clipper }:
+, pythonOlder, libnest2d, sip_4, clipper }:
 
 buildPythonPackage rec {
   version = "4.8.0";
@@ -13,7 +13,7 @@ buildPythonPackage rec {
     sha256 = "18dn92vgr4gvf9scfh93yg9bwrhdjvq62di08rpi7pqjrrvq2nvp";
   };
 
-  propagatedBuildInputs = [ libnest2d sip clipper ];
+  propagatedBuildInputs = [ libnest2d sip_4 clipper ];
   nativeBuildInputs = [ cmake ];
 
   CLIPPER_PATH = "${clipper.out}";
diff --git a/pkgs/development/python-modules/pyqt-builder/default.nix b/pkgs/development/python-modules/pyqt-builder/default.nix
index d7f15d966b3..d371fd7bcee 100644
--- a/pkgs/development/python-modules/pyqt-builder/default.nix
+++ b/pkgs/development/python-modules/pyqt-builder/default.nix
@@ -1,4 +1,4 @@
-{ lib, fetchPypi, buildPythonPackage, packaging, sip_5 }:
+{ lib, fetchPypi, buildPythonPackage, packaging, sip }:
 
 buildPythonPackage rec {
   pname = "pyqt-builder";
@@ -10,7 +10,7 @@ buildPythonPackage rec {
     sha256 = "0g51yak53zzjs4gpq65i01cmpz7w8cjny9wfyxlgr2vi0wag107v";
   };
 
-  propagatedBuildInputs = [ packaging sip_5 ];
+  propagatedBuildInputs = [ packaging sip ];
 
   pythonImportsCheck = [ "pyqtbuild" ];
 
diff --git a/pkgs/development/python-modules/pyqt/4.x.nix b/pkgs/development/python-modules/pyqt/4.x.nix
index 3427438b8a2..2652b5eb00b 100644
--- a/pkgs/development/python-modules/pyqt/4.x.nix
+++ b/pkgs/development/python-modules/pyqt/4.x.nix
@@ -1,13 +1,13 @@
-{ lib, stdenv, fetchurl, buildPythonPackage, python, dbus-python, sip, qt4, pkg-config, lndir, dbus, makeWrapper }:
+{ lib, stdenv, fetchurl, buildPythonPackage, python, dbus-python, sip_4, qt4, pkg-config, lndir, dbus, makeWrapper }:
 
 buildPythonPackage rec {
   pname = "PyQt-x11-gpl";
-  version = "4.12";
+  version = "4.12.3";
   format = "other";
 
   src = fetchurl {
     url = "mirror://sourceforge/pyqt/PyQt4_gpl_x11-${version}.tar.gz";
-    sha256 = "1nw8r88a5g2d550yvklawlvns8gd5slw53yy688kxnsa65aln79w";
+    sha256 = "0wnlasg62rm5d39nq1yw4namcx2ivxgzl93r5f2vb9s0yaz5l3x0";
   };
 
   postPatch = ''
@@ -45,7 +45,7 @@ buildPythonPackage rec {
   nativeBuildInputs = [ pkg-config lndir makeWrapper qt4 ];
   buildInputs = [ qt4 dbus ];
 
-  propagatedBuildInputs = [ sip ];
+  propagatedBuildInputs = [ sip_4 ];
 
   postInstall = ''
     for i in $out/bin/*; do
diff --git a/pkgs/development/python-modules/pyqt/5.x.nix b/pkgs/development/python-modules/pyqt/5.x.nix
index 6e4b4d37f28..2671b27a630 100644
--- a/pkgs/development/python-modules/pyqt/5.x.nix
+++ b/pkgs/development/python-modules/pyqt/5.x.nix
@@ -16,9 +16,9 @@ let
   inherit (pythonPackages) buildPythonPackage python isPy3k dbus-python enum34;
 
   sip = if isPy3k then
-    pythonPackages.sip_5
+    pythonPackages.sip
   else
-    (pythonPackages.sip.override { sip-module = "PyQt5.sip"; }).overridePythonAttrs(oldAttrs: {
+    (pythonPackages.sip_4.override { sip-module = "PyQt5.sip"; }).overridePythonAttrs(oldAttrs: {
       # If we install sip in another folder, then we need to create a __init__.py as well
       # if we want to be able to import it with Python 2.
       # Python 3 could rely on it being an implicit namespace package, however,
diff --git a/pkgs/development/python-modules/python-engineio/3.nix b/pkgs/development/python-modules/python-engineio/3.nix
index e4c71782f99..5deeec0bb57 100644
--- a/pkgs/development/python-modules/python-engineio/3.nix
+++ b/pkgs/development/python-modules/python-engineio/3.nix
@@ -13,6 +13,7 @@
 , websocket_client
 , websockets
 , pytestCheckHook
+, pythonAtLeast
 }:
 
 buildPythonPackage rec {
@@ -63,5 +64,6 @@ buildPythonPackage rec {
     homepage = "https://github.com/miguelgrinberg/python-engineio/";
     license = with licenses; [ mit ];
     maintainers = with maintainers; [ graham33 ];
+    broken = stdenv.isDarwin && (pythonAtLeast "3.9");  # See https://github.com/miguelgrinberg/python-socketio/issues/567
   };
 }
diff --git a/pkgs/development/python-modules/qscintilla-qt5/default.nix b/pkgs/development/python-modules/qscintilla-qt5/default.nix
index dcbe213966f..05c12c1c62a 100644
--- a/pkgs/development/python-modules/qscintilla-qt5/default.nix
+++ b/pkgs/development/python-modules/qscintilla-qt5/default.nix
@@ -10,7 +10,7 @@ buildPythonPackage {
   src = qscintilla.src;
   format = "other";
 
-  nativeBuildInputs = [ sip qtbase ];
+  nativeBuildInputs = [ sip_4 qtbase ];
   buildInputs = [ qscintilla ];
   propagatedBuildInputs = [ pyqt5 ];
 
@@ -40,7 +40,7 @@ buildPythonPackage {
       --qsci-libdir=${qscintilla}/lib \
       --pyqt-sipdir=${pyqt5}/share/sip/PyQt5 \
       --qsci-sipdir=$out/share/sip/PyQt5 \
-      --sip-incdir=${sip}/include
+      --sip-incdir=${sip_4}/include
   '';
 
   meta = with lib; {
diff --git a/pkgs/development/python-modules/random2/default.nix b/pkgs/development/python-modules/random2/default.nix
index 6845a5707da..cb84d32ef41 100644
--- a/pkgs/development/python-modules/random2/default.nix
+++ b/pkgs/development/python-modules/random2/default.nix
@@ -2,6 +2,7 @@
 , buildPythonPackage
 , fetchPypi
 , isPyPy
+, fetchpatch
 }:
 
 buildPythonPackage rec {
@@ -15,6 +16,14 @@ buildPythonPackage rec {
     sha256 = "34ad30aac341039872401595df9ab2c9dc36d0b7c077db1cea9ade430ed1c007";
   };
 
+  patches = [
+    # Patch test suite for python >= 3.9
+    (fetchpatch {
+      url = "https://github.com/strichter/random2/pull/3/commits/1bac6355d9c65de847cc445d782c466778b94fbd.patch";
+      sha256 = "064137pg1ilv3f9r10123lqbqz45070jca8pjjyp6gpfd0yk74pi";
+    })
+  ];
+
   meta = with lib; {
     homepage = "http://pypi.python.org/pypi/random2";
     description = "Python 3 compatible Python 2 `random` Module";
diff --git a/pkgs/development/python-modules/sip/4.x.nix b/pkgs/development/python-modules/sip/4.x.nix
new file mode 100644
index 00000000000..5334d119634
--- /dev/null
+++ b/pkgs/development/python-modules/sip/4.x.nix
@@ -0,0 +1,44 @@
+{ lib, fetchurl, buildPythonPackage, python, isPyPy, sip-module ? "sip" }:
+
+buildPythonPackage rec {
+  pname = sip-module;
+  version = "4.19.25";
+  format = "other";
+
+  disabled = isPyPy;
+
+  src = fetchurl {
+    url = "https://www.riverbankcomputing.com/static/Downloads/sip/${version}/sip-${version}.tar.gz";
+    sha256 = "04a23cgsnx150xq86w1z44b6vr2zyazysy9mqax0fy346zlr77dk";
+  };
+
+  configurePhase = ''
+    ${python.executable} ./configure.py \
+      --sip-module ${sip-module} \
+      -d $out/${python.sitePackages} \
+      -b $out/bin -e $out/include
+  '';
+
+  enableParallelBuilding = true;
+
+  installCheckPhase = let
+    modules = [
+      sip-module
+      "sipconfig"
+    ];
+    imports = lib.concatMapStrings (module: "import ${module};") modules;
+  in ''
+    echo "Checking whether modules can be imported..."
+    PYTHONPATH=$out/${python.sitePackages}:$PYTHONPATH ${python.interpreter} -c "${imports}"
+  '';
+
+  doCheck = true;
+
+  meta = with lib; {
+    description = "Creates C++ bindings for Python modules";
+    homepage    = "http://www.riverbankcomputing.co.uk/";
+    license     = licenses.gpl2Plus;
+    maintainers = with maintainers; [ lovek323 sander ];
+    platforms   = platforms.all;
+  };
+}
diff --git a/pkgs/development/python-modules/sip/5.x.nix b/pkgs/development/python-modules/sip/5.x.nix
deleted file mode 100644
index c15589b77bc..00000000000
--- a/pkgs/development/python-modules/sip/5.x.nix
+++ /dev/null
@@ -1,40 +0,0 @@
-{ lib, stdenv, fetchPypi, buildPythonPackage, packaging, toml }:
-
-buildPythonPackage rec {
-  pname = "sip";
-  version = "5.5.0";
-
-  src = fetchPypi {
-    pname = "sip";
-    inherit version;
-    sha256 = "1idaivamp1jvbbai9yzv471c62xbqxhaawccvskaizihkd0lq0jx";
-  };
-
-  propagatedBuildInputs = [ packaging toml ];
-
-  # There aren't tests
-  doCheck = false;
-
-  pythonImportsCheck = [ "sipbuild" ];
-
-  # FIXME: Why isn't this detected automatically?
-  # Needs to be specified in pyproject.toml, e.g.:
-  # [tool.sip.bindings.MODULE]
-  # tags = [PLATFORM_TAG]
-  platform_tag =
-    if stdenv.targetPlatform.isLinux then
-      "WS_X11"
-    else if stdenv.targetPlatform.isDarwin then
-      "WS_MACX"
-    else if stdenv.targetPlatform.isWindows then
-      "WS_WIN"
-    else
-      throw "unsupported platform";
-
-  meta = with lib; {
-    description = "Creates C++ bindings for Python modules";
-    homepage    = "http://www.riverbankcomputing.co.uk/";
-    license     = licenses.gpl3Only;
-    maintainers = with maintainers; [ eduardosm ];
-  };
-}
diff --git a/pkgs/development/python-modules/sip/default.nix b/pkgs/development/python-modules/sip/default.nix
index 0027c1c0ba5..c15589b77bc 100644
--- a/pkgs/development/python-modules/sip/default.nix
+++ b/pkgs/development/python-modules/sip/default.nix
@@ -1,44 +1,40 @@
-{ lib, fetchurl, buildPythonPackage, python, isPyPy, sip-module ? "sip" }:
+{ lib, stdenv, fetchPypi, buildPythonPackage, packaging, toml }:
 
 buildPythonPackage rec {
-  pname = sip-module;
-  version = "4.19.24";
-  format = "other";
+  pname = "sip";
+  version = "5.5.0";
 
-  disabled = isPyPy;
-
-  src = fetchurl {
-    url = "https://www.riverbankcomputing.com/static/Downloads/sip/${version}/sip-${version}.tar.gz";
-    sha256 = "1ra15vb5i9gkg2vdvh16cq9x2mmzw1yi3xphxs8q34q1pf83gkgd";
+  src = fetchPypi {
+    pname = "sip";
+    inherit version;
+    sha256 = "1idaivamp1jvbbai9yzv471c62xbqxhaawccvskaizihkd0lq0jx";
   };
 
-  configurePhase = ''
-    ${python.executable} ./configure.py \
-      --sip-module ${sip-module} \
-      -d $out/${python.sitePackages} \
-      -b $out/bin -e $out/include
-  '';
+  propagatedBuildInputs = [ packaging toml ];
 
-  enableParallelBuilding = true;
+  # There aren't tests
+  doCheck = false;
 
-  installCheckPhase = let
-    modules = [
-      sip-module
-      "sipconfig"
-    ];
-    imports = lib.concatMapStrings (module: "import ${module};") modules;
-  in ''
-    echo "Checking whether modules can be imported..."
-    PYTHONPATH=$out/${python.sitePackages}:$PYTHONPATH ${python.interpreter} -c "${imports}"
-  '';
+  pythonImportsCheck = [ "sipbuild" ];
 
-  doCheck = true;
+  # FIXME: Why isn't this detected automatically?
+  # Needs to be specified in pyproject.toml, e.g.:
+  # [tool.sip.bindings.MODULE]
+  # tags = [PLATFORM_TAG]
+  platform_tag =
+    if stdenv.targetPlatform.isLinux then
+      "WS_X11"
+    else if stdenv.targetPlatform.isDarwin then
+      "WS_MACX"
+    else if stdenv.targetPlatform.isWindows then
+      "WS_WIN"
+    else
+      throw "unsupported platform";
 
   meta = with lib; {
     description = "Creates C++ bindings for Python modules";
     homepage    = "http://www.riverbankcomputing.co.uk/";
-    license     = licenses.gpl2Plus;
-    maintainers = with maintainers; [ lovek323 sander ];
-    platforms   = platforms.all;
+    license     = licenses.gpl3Only;
+    maintainers = with maintainers; [ eduardosm ];
   };
 }
diff --git a/pkgs/development/python-modules/sphinx/default.nix b/pkgs/development/python-modules/sphinx/default.nix
index 1c5cc29f414..8d6567b3e91 100644
--- a/pkgs/development/python-modules/sphinx/default.nix
+++ b/pkgs/development/python-modules/sphinx/default.nix
@@ -1,24 +1,18 @@
 { lib
 , buildPythonPackage
-, fetchPypi
-, pytest
-, simplejson
-, mock
-, glibcLocales
-, html5lib
 , pythonOlder
-, enum34
-, python
+, fetchFromGitHub
+# propagatedBuildInputs
+, Babel
+, alabaster
 , docutils
+, imagesize
 , jinja2
+, packaging
 , pygments
-, alabaster
-, Babel
-, snowballstemmer
-, six
-, whoosh
-, imagesize
 , requests
+, setuptools
+, snowballstemmer
 , sphinxcontrib-applehelp
 , sphinxcontrib-devhelp
 , sphinxcontrib-htmlhelp
@@ -26,56 +20,70 @@
 , sphinxcontrib-qthelp
 , sphinxcontrib-serializinghtml
 , sphinxcontrib-websupport
-, typing ? null
-, setuptools
-, packaging
+# check phase
+, html5lib
+, imagemagick
+, pytestCheckHook
+, typed-ast
 }:
 
 buildPythonPackage rec {
   pname = "sphinx";
-  version = "3.3.1";
-  src = fetchPypi {
-    pname = "Sphinx";
-    inherit version;
-    sha256 = "1e8d592225447104d1172be415bc2972bd1357e3e12fdc76edf2261105db4300";
+  version = "3.5.4";
+  disabled = pythonOlder "3.5";
+
+  src = fetchFromGitHub {
+    owner = "sphinx-doc";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1xjii3dl01rq8x2bsxc6zywiy1s7arfgxrg5l8ml54w1748shadd";
   };
-  LC_ALL = "en_US.UTF-8";
 
-  checkInputs = [ pytest ];
-  buildInputs = [ simplejson mock glibcLocales html5lib ] ++ lib.optional (pythonOlder "3.4") enum34;
-  # Disable two tests that require network access.
-  checkPhase = ''
-    cd tests; ${python.interpreter} run.py --ignore py35 -k 'not test_defaults and not test_anchors_ignored'
-  '';
   propagatedBuildInputs = [
+    Babel
+    alabaster
     docutils
+    imagesize
     jinja2
-    pygments
-    alabaster
-    Babel
     packaging
+    pygments
+    requests
     setuptools
     snowballstemmer
-    six
-    whoosh
-    imagesize
-    requests
     sphinxcontrib-applehelp
     sphinxcontrib-devhelp
     sphinxcontrib-htmlhelp
     sphinxcontrib-jsmath
     sphinxcontrib-qthelp
     sphinxcontrib-serializinghtml
+    # extra[docs]
     sphinxcontrib-websupport
-  ] ++ lib.optional (pythonOlder "3.5") typing;
+  ];
+
+  checkInputs = [
+    imagemagick
+    html5lib
+    pytestCheckHook
+  ] ++ lib.optionals (pythonOlder "3.8") [
+    typed-ast
+  ];
 
-  # Lots of tests. Needs network as well at some point.
-  doCheck = false;
+  disabledTests = [
+    # requires network access
+    "test_anchors_ignored"
+    "test_defaults"
+    "test_defaults_json"
+    "test_latex_images"
+  ];
 
-  meta = {
-    description = "A tool that makes it easy to create intelligent and beautiful documentation for Python projects";
-    homepage = "http://sphinx.pocoo.org/";
-    license = lib.licenses.bsd3;
-    maintainers = with lib.maintainers; [ nand0p ];
+  meta = with lib; {
+    description = "Python documentation generator";
+    longDescription = ''
+      A tool that makes it easy to create intelligent and beautiful
+      documentation for Python projects
+    '';
+    homepage = "https://www.sphinx-doc.org";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ nand0p ];
   };
 }
diff --git a/pkgs/development/python-modules/timeago/default.nix b/pkgs/development/python-modules/timeago/default.nix
new file mode 100644
index 00000000000..0c2a688f674
--- /dev/null
+++ b/pkgs/development/python-modules/timeago/default.nix
@@ -0,0 +1,32 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "timeago";
+  version = "1.0.15";
+
+  src = fetchFromGitHub {
+    owner = "hustcc";
+    repo = pname;
+    rev = version;
+    sha256 = "03vm7c02l4g2d1x33w382i1psk8i3an7xchk69yinha33fjj1cag";
+  };
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pytestFlagsArray = [ "test/testcase.py" ];
+
+  pythonImportsCheck = [ "timeago" ];
+
+  meta = with lib; {
+    description = "Python module to format past datetime output";
+    homepage = "https://github.com/hustcc/timeago";
+    license = with licenses; [ mit ];
+    maintainers = with maintainers; [ fab ];
+  };
+}
diff --git a/pkgs/development/python-modules/txaio/default.nix b/pkgs/development/python-modules/txaio/default.nix
index c2f2c9451bd..fa219a94513 100644
--- a/pkgs/development/python-modules/txaio/default.nix
+++ b/pkgs/development/python-modules/txaio/default.nix
@@ -1,30 +1,55 @@
-{ lib, buildPythonPackage, fetchPypi, pytest, mock, six, twisted, isPy37, isPy27 }:
+{ lib
+, buildPythonPackage
+, fetchPypi
+, mock
+, pytest-asyncio
+, pytestCheckHook
+, pythonOlder
+, six
+, twisted
+, zope_interface
+}:
 
 buildPythonPackage rec {
   pname = "txaio";
   version = "21.2.1";
-  disabled = isPy27;
+  disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "7d6f89745680233f1c4db9ddb748df5e88d2a7a37962be174c0fd04c8dba1dc8";
+    sha256 = "sha256-fW+JdFaAIz8cTbndt0jfXojSp6N5Yr4XTA/QTI26Hcg=";
   };
 
-  checkInputs = [ pytest mock ];
+  propagatedBuildInputs = [
+    six
+    twisted
+    zope_interface
+  ];
 
-  propagatedBuildInputs = [ six twisted ];
+  checkInputs = [
+    mock
+    pytest-asyncio
+    pytestCheckHook
+  ];
 
-  checkPhase = ''
-    py.test -k "not test_sdist"
-  '';
+  disabledTests = [
+    # No real value
+    "test_sdist"
+    # Some tests seems out-dated and require additional data
+    "test_as_future"
+    "test_errback"
+    "test_create_future"
+    "test_callback"
+    "test_immediate_result"
+    "test_cancel"
+  ];
 
-  # Needs some fixing
-  doCheck = false;
+  pythonImportsCheck = [ "txaio" ];
 
   meta = with lib; {
-    description = "Utilities to support code that runs unmodified on Twisted and asyncio.";
-    homepage    = "https://github.com/crossbario/txaio";
-    license     = licenses.mit;
+    description = "Utilities to support code that runs unmodified on Twisted and asyncio";
+    homepage = "https://github.com/crossbario/txaio";
+    license = licenses.mit;
     maintainers = with maintainers; [ nand0p ];
   };
 }
diff --git a/pkgs/development/r-modules/generic-builder.nix b/pkgs/development/r-modules/generic-builder.nix
index a10c3628ff8..7201bab40e1 100644
--- a/pkgs/development/r-modules/generic-builder.nix
+++ b/pkgs/development/r-modules/generic-builder.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation ({
                 lib.optionals stdenv.isDarwin [Cocoa Foundation gfortran];
 
   NIX_CFLAGS_COMPILE =
-    lib.optionalString stdenv.isDarwin "-I${libcxx}/include/c++/v1";
+    lib.optionalString stdenv.isDarwin "-I${lib.getDev libcxx}/include/c++/v1";
 
   configurePhase = ''
     runHook preConfigure
diff --git a/pkgs/development/tools/analysis/include-what-you-use/default.nix b/pkgs/development/tools/analysis/include-what-you-use/default.nix
index db1cf9c6ead..6cc9409e94a 100644
--- a/pkgs/development/tools/analysis/include-what-you-use/default.nix
+++ b/pkgs/development/tools/analysis/include-what-you-use/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, cmake, llvmPackages, python2 }:
+{ lib, stdenv, fetchurl, cmake, llvmPackages, python3 }:
 
 stdenv.mkDerivation rec {
   pname = "include-what-you-use";
@@ -10,8 +10,8 @@ stdenv.mkDerivation rec {
     url = "${meta.homepage}/downloads/${pname}-${version}.src.tar.gz";
   };
 
-  buildInputs = with llvmPackages; [ clang-unwrapped llvm python2 ];
-  nativeBuildInputs = [ cmake ];
+  nativeBuildInputs = with llvmPackages; [ cmake llvm.dev llvm clang-unwrapped python3];
+  buildInputs = [ llvmPackages.libclang ];
 
   cmakeFlags = [ "-DIWYU_LLVM_ROOT_PATH=${llvmPackages.clang-unwrapped}" ];
 
diff --git a/pkgs/development/tools/boomerang/default.nix b/pkgs/development/tools/boomerang/default.nix
index 4ac9159520f..b37ab9a2d3f 100644
--- a/pkgs/development/tools/boomerang/default.nix
+++ b/pkgs/development/tools/boomerang/default.nix
@@ -1,8 +1,11 @@
-{ mkDerivation, lib, fetchFromGitHub, cmake, qtbase, capstone, bison, flex }:
+{ mkDerivation, lib, fetchFromGitHub, fetchpatch, cmake, qtbase, capstone, bison, flex }:
 
 mkDerivation rec {
   pname = "boomerang";
   version = "0.5.2";
+  # NOTE: When bumping version beyond 0.5.2, you likely need to remove
+  #       the cstdint.patch below. The patch does a fix that has already
+  #       been done upstream but is not yet part of a release
 
   src = fetchFromGitHub {
     owner = "BoomerangDecompiler";
@@ -13,6 +16,13 @@ mkDerivation rec {
 
   nativeBuildInputs = [ cmake bison flex ];
   buildInputs = [ qtbase capstone ];
+  patches = [
+    (fetchpatch {
+      name = "include-missing-cstdint.patch";
+      url = "https://github.com/BoomerangDecompiler/boomerang/commit/3342b0eac6b7617d9913226c06c1470820593e74.patch";
+      sha256 = "sha256-941IydcV3mqj7AWvXTM6GePW5VgawEcL0wrBCXqeWvc=";
+    })
+  ];
 
   meta = with lib; {
     homepage = "https://github.com/BoomerangDecompiler/boomerang";
diff --git a/pkgs/development/tools/build-managers/bazel/bazel_3/default.nix b/pkgs/development/tools/build-managers/bazel/bazel_3/default.nix
index 5b20ece7680..fd29102b7e5 100644
--- a/pkgs/development/tools/build-managers/bazel/bazel_3/default.nix
+++ b/pkgs/development/tools/build-managers/bazel/bazel_3/default.nix
@@ -371,7 +371,7 @@ stdenv.mkDerivation rec {
 
       # libcxx includes aren't added by libcxx hook
       # https://github.com/NixOS/nixpkgs/pull/41589
-      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem ${libcxx}/include/c++/v1"
+      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem ${lib.getDev libcxx}/include/c++/v1"
 
       # don't use system installed Xcode to run clang, use Nix clang instead
       sed -i -E "s;/usr/bin/xcrun (--sdk macosx )?clang;${stdenv.cc}/bin/clang $NIX_CFLAGS_COMPILE $(bazelLinkFlags) -framework CoreFoundation;g" \
diff --git a/pkgs/development/tools/build-managers/bazel/bazel_4/default.nix b/pkgs/development/tools/build-managers/bazel/bazel_4/default.nix
index 31dbc2779cd..7fc03422016 100644
--- a/pkgs/development/tools/build-managers/bazel/bazel_4/default.nix
+++ b/pkgs/development/tools/build-managers/bazel/bazel_4/default.nix
@@ -388,7 +388,7 @@ stdenv.mkDerivation rec {
 
       # libcxx includes aren't added by libcxx hook
       # https://github.com/NixOS/nixpkgs/pull/41589
-      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem ${libcxx}/include/c++/v1"
+      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -isystem ${lib.getDev libcxx}/include/c++/v1"
 
       # don't use system installed Xcode to run clang, use Nix clang instead
       sed -i -E "s;/usr/bin/xcrun (--sdk macosx )?clang;${stdenv.cc}/bin/clang $NIX_CFLAGS_COMPILE $(bazelLinkFlags) -framework CoreFoundation;g" \
diff --git a/pkgs/development/tools/castxml/default.nix b/pkgs/development/tools/castxml/default.nix
index f3d9b74181a..a233288a28e 100644
--- a/pkgs/development/tools/castxml/default.nix
+++ b/pkgs/development/tools/castxml/default.nix
@@ -1,7 +1,6 @@
 { lib
 , stdenv
 , fetchFromGitHub
-, clang-unwrapped
 , cmake
 , libclang
 , libffi
@@ -26,22 +25,22 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [
     cmake
-    llvm
+    llvm.dev
   ] ++ lib.optionals (withManual || withHTML) [
     sphinx
   ];
 
   cmakeFlags = [
-    "-DCLANG_RESOURCE_DIR=${clang-unwrapped}/lib/clang/${lib.getVersion clang-unwrapped}/"
+    "-DCLANG_RESOURCE_DIR=${libclang.dev}/"
     "-DSPHINX_HTML=${if withHTML then "ON" else "OFF"}"
     "-DSPHINX_MAN=${if withManual then "ON" else "OFF"}"
   ];
 
   buildInputs = [
-    clang-unwrapped
     libffi
     libxml2
     zlib
+    libclang
   ];
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/tools/documentation/gtk-doc/default.nix b/pkgs/development/tools/documentation/gtk-doc/default.nix
index a735bdb5fed..5951c8d71fd 100644
--- a/pkgs/development/tools/documentation/gtk-doc/default.nix
+++ b/pkgs/development/tools/documentation/gtk-doc/default.nix
@@ -32,6 +32,13 @@ python3.pkgs.buildPythonApplication rec {
     passthru.respect_xml_catalog_files_var_patch
   ];
 
+  strictDeps = true;
+
+  depsBuildBuild = [
+    python3
+    pkg-config
+  ];
+
   nativeBuildInputs = [
     pkg-config
     gettext
diff --git a/pkgs/development/tools/irony-server/default.nix b/pkgs/development/tools/irony-server/default.nix
index 2f8afb176e6..2a7a7b1a16a 100644
--- a/pkgs/development/tools/irony-server/default.nix
+++ b/pkgs/development/tools/irony-server/default.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation {
   pname = "irony-server";
   inherit (irony) src version;
 
-  nativeBuildInputs = [ cmake ];
+  nativeBuildInputs = [ cmake llvmPackages.llvm.dev ];
   buildInputs = [ llvmPackages.libclang llvmPackages.llvm ];
 
   dontUseCmakeBuildDir = true;
diff --git a/pkgs/development/tools/luaformatter/default.nix b/pkgs/development/tools/luaformatter/default.nix
index 991f1a37717..ee34886a063 100644
--- a/pkgs/development/tools/luaformatter/default.nix
+++ b/pkgs/development/tools/luaformatter/default.nix
@@ -2,13 +2,13 @@
 
 stdenv.mkDerivation rec {
   pname = "luaformatter";
-  version = "1.3.4";
+  version = "1.3.5";
 
   src = fetchFromGitHub {
     owner = "koihik";
     repo = "luaformatter";
     rev = version;
-    sha256 = "163190g37r6npg5k5mhdwckdhv9nwy2gnfp5jjk8p0s6cyvydqjw";
+    sha256 = "sha256-TMo6zRfhVAXVh0tIC0PecaJCKr0ev45jOKm2+reTtS4=";
     fetchSubmodules = true;
   };
 
diff --git a/pkgs/development/tools/misc/binutils/default.nix b/pkgs/development/tools/misc/binutils/default.nix
index 995f3f7430c..8042655a859 100644
--- a/pkgs/development/tools/misc/binutils/default.nix
+++ b/pkgs/development/tools/misc/binutils/default.nix
@@ -107,8 +107,7 @@ stdenv.mkDerivation {
 
   hardeningDisable = [ "format" "pie" ];
 
-  # TODO(@Ericson2314): Always pass "--target" and always targetPrefix.
-  configurePlatforms = [ "build" "host" ] ++ lib.optional (stdenv.targetPlatform != stdenv.hostPlatform) "target";
+  configurePlatforms = [ "build" "host" "target" ];
 
   configureFlags =
     (if enableShared then [ "--enable-shared" "--disable-static" ]
@@ -126,7 +125,19 @@ stdenv.mkDerivation {
     # RUNPATH instead of RPATH on binaries.  This is important because
     # RUNPATH can be overriden using LD_LIBRARY_PATH at runtime.
     "--enable-new-dtags"
-  ] ++ lib.optionals gold [ "--enable-gold" "--enable-plugins" ];
+
+    # force target prefix. Some versions of binutils will make it empty
+    # if `--host` and `--target` are too close, even if Nixpkgs thinks
+    # the platforms are different (e.g. because not all the info makes
+    # the `config`). Other versions of binutils will always prefix if
+    # `--target` is passed, even if `--host` and `--target` are the same.
+    # The easiest thing for us to do is not leave it to chance, and force
+    # the program prefix to be what we want it to be.
+    "--program-prefix=${targetPrefix}"
+  ] ++ lib.optionals gold [
+    "--enable-gold"
+    "--enable-plugins"
+  ];
 
   doCheck = false; # fails
 
diff --git a/pkgs/development/tools/misc/ccls/default.nix b/pkgs/development/tools/misc/ccls/default.nix
index 06f3723509f..986363b83ef 100644
--- a/pkgs/development/tools/misc/ccls/default.nix
+++ b/pkgs/development/tools/misc/ccls/default.nix
@@ -12,8 +12,8 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-jipSipgD0avd7XODlpxnqjHK3s6nacaxbIQIddix7X8=";
   };
 
-  nativeBuildInputs = [ cmake ];
-  buildInputs = with llvmPackages; [ clang-unwrapped llvm rapidjson ];
+  nativeBuildInputs = [ cmake llvmPackages.llvm.dev ];
+  buildInputs = with llvmPackages; [ libclang llvm rapidjson ];
 
   cmakeFlags = [ "-DCCLS_VERSION=${version}" ];
 
diff --git a/pkgs/development/tools/misc/creduce/default.nix b/pkgs/development/tools/misc/creduce/default.nix
index 75234fde6ca..0ae900060b9 100644
--- a/pkgs/development/tools/misc/creduce/default.nix
+++ b/pkgs/development/tools/misc/creduce/default.nix
@@ -1,5 +1,5 @@
 { lib, stdenv, fetchurl, cmake, makeWrapper
-, llvm, clang-unwrapped
+, llvm, libclang
 , flex
 , zlib
 , perlPackages
@@ -15,12 +15,12 @@ stdenv.mkDerivation rec {
     sha256 = "1b833z0g1hich68kzbkpfc26xb8w2phfl5savy8c6ir9ihwy1a8w";
   };
 
-  nativeBuildInputs = [ cmake makeWrapper ];
+  nativeBuildInputs = [ cmake makeWrapper llvm.dev ];
   buildInputs = [
     # Ensure stdenv's CC is on PATH before clang-unwrapped
     stdenv.cc
     # Actual deps:
-    llvm clang-unwrapped
+    llvm libclang
     flex zlib
   ] ++ (with perlPackages; [ perl ExporterLite FileWhich GetoptTabular RegexpCommon TermReadKey ]);
 
diff --git a/pkgs/development/tools/misc/cvise/default.nix b/pkgs/development/tools/misc/cvise/default.nix
index fe33df530cf..e24c133e8b9 100644
--- a/pkgs/development/tools/misc/cvise/default.nix
+++ b/pkgs/development/tools/misc/cvise/default.nix
@@ -1,5 +1,5 @@
 { lib, buildPythonApplication, fetchFromGitHub, cmake, flex
-, clang-unwrapped, llvm, unifdef
+, libclang, llvm, unifdef
 , pebble, psutil, pytestCheckHook, pytest-flake8
 }:
 
@@ -19,8 +19,8 @@ buildPythonApplication rec {
     ./unifdef.patch
   ];
 
-  nativeBuildInputs = [ cmake flex ];
-  buildInputs = [ clang-unwrapped llvm unifdef ];
+  nativeBuildInputs = [ cmake flex llvm.dev ];
+  buildInputs = [ libclang llvm llvm.dev unifdef ];
   propagatedBuildInputs = [ pebble psutil ];
   checkInputs = [ pytestCheckHook pytest-flake8 unifdef ];
 
diff --git a/pkgs/development/tools/misc/gdb/default.nix b/pkgs/development/tools/misc/gdb/default.nix
index 6f923778975..66d4e8bc057 100644
--- a/pkgs/development/tools/misc/gdb/default.nix
+++ b/pkgs/development/tools/misc/gdb/default.nix
@@ -61,8 +61,7 @@ stdenv.mkDerivation rec {
 
   NIX_CFLAGS_COMPILE = "-Wno-format-nonliteral";
 
-  # TODO(@Ericson2314): Always pass "--target" and always prefix.
-  configurePlatforms = [ "build" "host" ] ++ lib.optional (stdenv.targetPlatform != stdenv.hostPlatform) "target";
+  configurePlatforms = [ "build" "host" "target" ];
 
   # GDB have to be built out of tree.
   preConfigure = ''
@@ -72,6 +71,13 @@ stdenv.mkDerivation rec {
   configureScript = "../configure";
 
   configureFlags = with lib; [
+    # Set the program prefix to the current targetPrefix.
+    # This ensures that the prefix always conforms to
+    # nixpkgs' expectations instead of relying on the build
+    # system which only receives `config` which is merely a
+    # subset of the platform description.
+    "--program-prefix=${targetPrefix}"
+
     "--enable-targets=all" "--enable-64-bit-bfd"
     "--disable-install-libbfd"
     "--disable-shared" "--enable-static"
diff --git a/pkgs/development/tools/parinfer-rust/default.nix b/pkgs/development/tools/parinfer-rust/default.nix
index ce733b8a213..2cd8ff4fdb6 100644
--- a/pkgs/development/tools/parinfer-rust/default.nix
+++ b/pkgs/development/tools/parinfer-rust/default.nix
@@ -15,7 +15,7 @@ rustPlatform.buildRustPackage rec {
 
   nativeBuildInputs = [ llvmPackages.clang ];
   buildInputs = [ llvmPackages.libclang ];
-  LIBCLANG_PATH = "${llvmPackages.libclang}/lib";
+  LIBCLANG_PATH = "${llvmPackages.libclang.lib}/lib";
 
   postInstall = ''
     mkdir -p $out/share/kak/autoload/plugins
diff --git a/pkgs/development/tools/parsing/re2c/default.nix b/pkgs/development/tools/parsing/re2c/default.nix
index ebba9903a47..a945f3bdde0 100644
--- a/pkgs/development/tools/parsing/re2c/default.nix
+++ b/pkgs/development/tools/parsing/re2c/default.nix
@@ -1,48 +1,16 @@
-{ lib, stdenv, fetchFromGitHub, fetchpatch, autoreconfHook }:
+{ lib, stdenv, fetchFromGitHub, autoreconfHook }:
 
 stdenv.mkDerivation rec {
   pname = "re2c";
-  version = "1.3";
+  version = "2.1.1";
 
   src = fetchFromGitHub {
     owner  = "skvadrik";
     repo   = "re2c";
     rev    = version;
-    sha256 = "0aqlf2h6i2m3dq11dkq89p4w4c9kp4x66s5rhp84gmpz5xqv1x5h";
+    sha256 = "06nvk5sf4vrc2bvpj4vi2xwy3ggv548sn530drz5fi67nhzgga26";
   };
 
-  patches = [
-    (fetchpatch {
-      name = "CVE-2018-21232-part1.patch";
-      url = "https://github.com/skvadrik/re2c/commit/fd634998f813340768c333cdad638498602856e5.patch";
-      sha256 = "1blyg5lyhqd4ymisih65xl0g36ig71ijia4skkkd59rdvj78aiw6";
-    })
-
-    (fetchpatch {
-      name = "CVE-2018-21232-part2.patch";
-      url = "https://github.com/skvadrik/re2c/commit/7b5643476bd99c994c4f51b8143f942982d85521.patch";
-      sha256 = "0rhmgqrinpk49r9x75ygrs14lz72aw5ad5kr6qp9bdyl8gs082qp";
-    })
-
-    (fetchpatch {
-      name = "CVE-2018-21232-part3.patch";
-      url = "https://github.com/skvadrik/re2c/commit/4d9c809355b574f2a58eac119f5e076c48e4d1e2.patch";
-      sha256 = "0k86wg9icw1gkqpf7rq2w6xsq4caxw3rc0zfxf39liwa35027rai";
-    })
-
-    (fetchpatch {
-      name = "CVE-2018-21232-part4.patch";
-      url = "https://github.com/skvadrik/re2c/commit/89be91f3df00657261870adbc590209fdb2bc405.patch";
-      sha256 = "1aygy9va7jwby93chlskwg7z90fn07x5hym0gziwlkx8k900p3a3";
-    })
-
-    (fetchpatch {
-      name = "CVE-2020-11958.patch";
-      url = "https://github.com/skvadrik/re2c/commit/c4603ba5ce229db83a2a4fb93e6d4b4e3ec3776a.patch";
-      sha256 = "1d95ahxk92g7k87sda9gxgmr3blyfzwd2y7h9jxj8zkd74knd9zh";
-    })
-  ];
-
   nativeBuildInputs = [ autoreconfHook ];
 
   doCheck = true;
@@ -54,7 +22,7 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "Tool for writing very fast and very flexible scanners";
-    homepage    = "http://re2c.org";
+    homepage    = "https://re2c.org";
     license     = licenses.publicDomain;
     platforms   = platforms.all;
     maintainers = with maintainers; [ thoughtpolice ];
diff --git a/pkgs/development/tools/poetry2nix/poetry2nix/overrides.nix b/pkgs/development/tools/poetry2nix/poetry2nix/overrides.nix
index aa58864fed7..f217aefc2d2 100644
--- a/pkgs/development/tools/poetry2nix/poetry2nix/overrides.nix
+++ b/pkgs/development/tools/poetry2nix/poetry2nix/overrides.nix
@@ -512,7 +512,7 @@ self: super:
 
       # Set directory containing llvm-config binary
       preConfigure = ''
-        export LLVM_CONFIG=${pkgs.llvm}/bin/llvm-config
+        export LLVM_CONFIG=${pkgs.llvm.dev}/bin/llvm-config
       '';
 
       __impureHostDeps = lib.optionals pkgs.stdenv.isDarwin [ "/usr/lib/libm.dylib" ];
diff --git a/pkgs/development/tools/qtcreator/default.nix b/pkgs/development/tools/qtcreator/default.nix
index dc5699ed373..2b0227407da 100644
--- a/pkgs/development/tools/qtcreator/default.nix
+++ b/pkgs/development/tools/qtcreator/default.nix
@@ -64,7 +64,7 @@ mkDerivation rec {
 
     # Fix paths to libclang library.
     substituteInPlace src/shared/clang/clang_installation.pri \
-      --replace 'LIBCLANG_LIBS = -L$${LLVM_LIBDIR}' 'LIBCLANG_LIBS = -L${llvmPackages_8.libclang}/lib' \
+      --replace 'LIBCLANG_LIBS = -L$${LLVM_LIBDIR}' 'LIBCLANG_LIBS = -L${llvmPackages_8.libclang.lib}/lib' \
       --replace 'LIBCLANG_LIBS += $${CLANG_LIB}' 'LIBCLANG_LIBS += -lclang' \
       --replace 'LIBTOOLING_LIBS = -L$${LLVM_LIBDIR}' 'LIBTOOLING_LIBS = -L${clang_qt_vendor}/lib' \
       --replace 'LLVM_CXXFLAGS ~= s,-gsplit-dwarf,' '${lib.concatStringsSep "\n" ["LLVM_CXXFLAGS ~= s,-gsplit-dwarf," "    LLVM_CXXFLAGS += -fno-rtti"]}'
diff --git a/pkgs/development/tools/rq/default.nix b/pkgs/development/tools/rq/default.nix
index 4dcc0b31563..c9e78650f60 100644
--- a/pkgs/development/tools/rq/default.nix
+++ b/pkgs/development/tools/rq/default.nix
@@ -20,11 +20,11 @@ rustPlatform.buildRustPackage rec {
 
   cargoSha256 = "0c5vwy3c5ji602dj64z6jqvcpi2xff03zvjbnwihb3ydqwnb3v67";
 
-  buildInputs = [ llvmPackages.clang-unwrapped v8 ]
+  buildInputs = [ llvmPackages.libclang v8 ]
   ++ lib.optionals stdenv.isDarwin [ libiconv ];
 
   configurePhase = ''
-    export LIBCLANG_PATH="${llvmPackages.clang-unwrapped}/lib"
+    export LIBCLANG_PATH="${llvmPackages.libclang.lib}/lib"
     export V8_SOURCE="${v8}"
   '';
 
diff --git a/pkgs/development/tools/rtags/default.nix b/pkgs/development/tools/rtags/default.nix
index e5da0ddf59a..6ecbe058328 100644
--- a/pkgs/development/tools/rtags/default.nix
+++ b/pkgs/development/tools/rtags/default.nix
@@ -3,8 +3,8 @@
 stdenv.mkDerivation rec {
   pname = "rtags";
   version = "2.38";
-  nativeBuildInputs = [ cmake pkg-config ];
-  buildInputs = [ llvmPackages.llvm openssl emacs ]
+  nativeBuildInputs = [ cmake pkg-config llvmPackages.llvm.dev ];
+  buildInputs = [ llvmPackages.llvm llvmPackages.libclang openssl emacs ]
     ++ lib.optionals stdenv.cc.isGNU [ llvmPackages.clang-unwrapped ]
     ++ lib.optionals stdenv.isDarwin [ apple_sdk.libs.xpc apple_sdk.frameworks.CoreServices ];
 
diff --git a/pkgs/development/tools/rust/bindgen/default.nix b/pkgs/development/tools/rust/bindgen/default.nix
index 962e8c562c7..9568d8efefc 100644
--- a/pkgs/development/tools/rust/bindgen/default.nix
+++ b/pkgs/development/tools/rust/bindgen/default.nix
@@ -27,7 +27,7 @@ rustPlatform.buildRustPackage rec {
   propagatedBuildInputs = [ clang ]; # to populate NIX_CXXSTDLIB_COMPILE
 
   configurePhase = ''
-    export LIBCLANG_PATH="${libclang}/lib"
+    export LIBCLANG_PATH="${libclang.lib}/lib"
   '';
 
   postInstall = ''
diff --git a/pkgs/development/tools/rust/cbindgen/default.nix b/pkgs/development/tools/rust/cbindgen/default.nix
index 5dad37d0816..2e3391de94e 100644
--- a/pkgs/development/tools/rust/cbindgen/default.nix
+++ b/pkgs/development/tools/rust/cbindgen/default.nix
@@ -11,7 +11,7 @@ rustPlatform.buildRustPackage rec {
     sha256 = "sha256-S3t1hv/mRn6vwyzT78DPIacqiJV3CnjGdOKsdSyYs8g=";
   };
 
-  cargoSha256 = "sha256-uaeJmGEQHVSuILlYlJOHmRWWdN6FPvrHu6CbJyb60MY=";
+  cargoSha256 = "1ycvbdgd50l1nahq63zi9yp3793smkswlwhsqjrmws5b1fqzv9w0";
 
   buildInputs = lib.optional stdenv.isDarwin Security;
 
diff --git a/pkgs/development/web/nodejs/v12.nix b/pkgs/development/web/nodejs/v12.nix
index 54f4352c53e..7fad6a020a8 100644
--- a/pkgs/development/web/nodejs/v12.nix
+++ b/pkgs/development/web/nodejs/v12.nix
@@ -1,8 +1,8 @@
-{ callPackage, openssl, icu, python2, lib, stdenv, enableNpm ? true }:
+{ callPackage, icu68, python2, lib, stdenv, enableNpm ? true }:
 
 let
   buildNodejs = callPackage ./nodejs.nix {
-    inherit openssl icu;
+    icu = icu68;
     python = python2;
   };
 in
diff --git a/pkgs/development/web/nodejs/v14.nix b/pkgs/development/web/nodejs/v14.nix
index 0d48003268c..535bfab7123 100644
--- a/pkgs/development/web/nodejs/v14.nix
+++ b/pkgs/development/web/nodejs/v14.nix
@@ -1,8 +1,8 @@
-{ callPackage, openssl, python3, lib, stdenv, enableNpm ? true }:
+{ callPackage, icu68, python3, lib, stdenv, enableNpm ? true }:
 
 let
   buildNodejs = callPackage ./nodejs.nix {
-    inherit openssl;
+    icu = icu68;
     python = python3;
   };
 in
diff --git a/pkgs/development/web/nodejs/v15.nix b/pkgs/development/web/nodejs/v15.nix
index d22c2f213b9..e6903098b30 100644
--- a/pkgs/development/web/nodejs/v15.nix
+++ b/pkgs/development/web/nodejs/v15.nix
@@ -1,8 +1,8 @@
-{ callPackage, openssl, python3, enableNpm ? true }:
+{ callPackage, icu68, python3, enableNpm ? true }:
 
 let
   buildNodejs = callPackage ./nodejs.nix {
-    inherit openssl;
+    icu = icu68;
     python = python3;
   };
 in