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-rw-r--r--pkgs/applications/version-management/cvs/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/version-management/cvs/default.nix b/pkgs/applications/version-management/cvs/default.nix
index 4ee553c6c4be..20a38f9f8e8c 100644
--- a/pkgs/applications/version-management/cvs/default.nix
+++ b/pkgs/applications/version-management/cvs/default.nix
@@ -40,7 +40,7 @@ stdenv.mkDerivation rec {
"AR=${stdenv.cc.targetPrefix}ar"
];
- env = lib.optionalAttrs stdenv.cc.isClang {
+ env = lib.optionalAttrs (stdenv.isDarwin && stdenv.cc.isClang) {
NIX_CFLAGS_COMPILE = "-Wno-implicit-function-declaration";
};