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-rw-r--r--pkgs/applications/version-management/rcs/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/version-management/rcs/default.nix b/pkgs/applications/version-management/rcs/default.nix
index a829af8aa23..3e66f85ff73 100644
--- a/pkgs/applications/version-management/rcs/default.nix
+++ b/pkgs/applications/version-management/rcs/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
 
   doCheck = true;
 
-  NIX_CFLAGS_COMPILE = if stdenv.isDarwin then "-std=gnu99" else null;
+  NIX_CFLAGS_COMPILE = "-std=gnu99";
 
   meta = {
     homepage = http://www.gnu.org/software/rcs/;