1 files changed, 2 insertions, 1 deletions
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";