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-rw-r--r--pkgs/servers/mail/archiveopteryx/default.nix2
-rw-r--r--pkgs/servers/nosql/arangodb/default.nix2
-rw-r--r--pkgs/servers/sql/postgresql/default.nix2
3 files changed, 3 insertions, 3 deletions
diff --git a/pkgs/servers/mail/archiveopteryx/default.nix b/pkgs/servers/mail/archiveopteryx/default.nix
index 3443a508aea..55cc4c121f0 100644
--- a/pkgs/servers/mail/archiveopteryx/default.nix
+++ b/pkgs/servers/mail/archiveopteryx/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   '';
 
   # fix build on gcc7+
-  NIX_CFLAGS_COMPILE = [
+  NIX_CFLAGS_COMPILE = builtins.toString [
     "-Wno-error=builtin-declaration-mismatch"
     "-Wno-error=implicit-fallthrough"
     "-Wno-error=deprecated-copy"
diff --git a/pkgs/servers/nosql/arangodb/default.nix b/pkgs/servers/nosql/arangodb/default.nix
index ef75dad9151..e41930a2f48 100644
--- a/pkgs/servers/nosql/arangodb/default.nix
+++ b/pkgs/servers/nosql/arangodb/default.nix
@@ -17,7 +17,7 @@ let
 
     # prevent failing with "cmake-3.13.4/nix-support/setup-hook: line 10: ./3rdParty/rocksdb/RocksDBConfig.cmake.in: No such file or directory"
     dontFixCmake       =                     lib.versionAtLeast version "3.5";
-    NIX_CFLAGS_COMPILE = lib.optionals      (lib.versionAtLeast version "3.5") [ "-Wno-error" ];
+    NIX_CFLAGS_COMPILE = lib.optionalString (lib.versionAtLeast version "3.5") "-Wno-error";
     preConfigure       = lib.optionalString (lib.versionAtLeast version "3.5") "patchShebangs utils";
 
     postPatch = ''
diff --git a/pkgs/servers/sql/postgresql/default.nix b/pkgs/servers/sql/postgresql/default.nix
index 440375db841..3f05b3e36c1 100644
--- a/pkgs/servers/sql/postgresql/default.nix
+++ b/pkgs/servers/sql/postgresql/default.nix
@@ -44,7 +44,7 @@ let
 
     buildFlags = [ "world" ];
 
-    NIX_CFLAGS_COMPILE = [ "-I${libxml2.dev}/include/libxml2" ];
+    NIX_CFLAGS_COMPILE = "-I${libxml2.dev}/include/libxml2";
 
     # Otherwise it retains a reference to compiler and fails; see #44767.  TODO: better.
     preConfigure = "CC=${stdenv.cc.targetPrefix}cc";