3 files changed, 4 insertions, 3 deletions
diff --git a/pkgs/tools/archivers/p7zip/default.nix b/pkgs/tools/archivers/p7zip/default.nix
index 3dac4245de4..3b212b186aa 100644
--- a/pkgs/tools/archivers/p7zip/default.nix
+++ b/pkgs/tools/archivers/p7zip/default.nix
@@ -37,7 +37,7 @@ stdenv.mkDerivation rec {
 
   setupHook = ./setup-hook.sh;
 
-  NIX_CFLAGS_COMPILE = "-Wno-error=c++11-narrowing";
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.cc.isClang "-Wno-error=c++11-narrowing";
 
   meta = {
     homepage = http://p7zip.sourceforge.net/;
diff --git a/pkgs/tools/compression/pbzip2/default.nix b/pkgs/tools/compression/pbzip2/default.nix
index c7c1b7efc94..1d5cd85a62e 100644
--- a/pkgs/tools/compression/pbzip2/default.nix
+++ b/pkgs/tools/compression/pbzip2/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
 
   installFlags = "PREFIX=$(out)";
 
-  NIX_CFLAGS_COMPILE = "-Wno-error=reserved-user-defined-literal";
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.cc.isClang "-Wno-error=reserved-user-defined-literal";
 
   meta = with stdenv.lib; {
     homepage = http://compression.ca/pbzip2/;
diff --git a/pkgs/tools/networking/ntopng/default.nix b/pkgs/tools/networking/ntopng/default.nix
index b1e1bfcdd65..06d28e844ff 100644
--- a/pkgs/tools/networking/ntopng/default.nix
+++ b/pkgs/tools/networking/ntopng/default.nix
@@ -53,7 +53,8 @@ stdenv.mkDerivation rec {
     sed 's|LIBS += -lstdc++.6||' -i Makefile
   '';
 
-  NIX_CFLAGS_COMPILE = [ "-fpermissive" "-Wno-error=reserved-user-defined-literal" ];
+  NIX_CFLAGS_COMPILE = [ "-fpermissive" ]
+    ++ stdenv.lib.optional stdenv.cc.isClang "-Wno-error=reserved-user-defined-literal";
 
   meta = with stdenv.lib; {
     description = "High-speed web-based traffic analysis and flow collection tool";