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-rw-r--r--pkgs/applications/science/astronomy/xplanet/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/science/astronomy/xplanet/default.nix b/pkgs/applications/science/astronomy/xplanet/default.nix
index aae9adfed67a..5f02dc27a224 100644
--- a/pkgs/applications/science/astronomy/xplanet/default.nix
+++ b/pkgs/applications/science/astronomy/xplanet/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
     ./gcc6.patch
   ];
 
-  NIX_CFLAGS_COMPILE = "-Wno-error=c++11-narrowing";
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.cc.isClang "-Wno-error=c++11-narrowing";
 
   meta = {
     description = "Renders an image of the earth or other planets into the X root window";