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-rw-r--r--pkgs/development/python2-modules/pygtk/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/python2-modules/pygtk/default.nix b/pkgs/development/python2-modules/pygtk/default.nix
index 95447127ad06..c3960dd5309d 100644
--- a/pkgs/development/python2-modules/pygtk/default.nix
+++ b/pkgs/development/python2-modules/pygtk/default.nix
@@ -37,8 +37,8 @@ buildPythonPackage rec {
 
   buildPhase = "buildPhase";
 
-  env.NIX_CFLAGS_COMPILE = lib.optional stdenv.isDarwin "-ObjC"
-    ++ lib.optional (stdenv.isDarwin && stdenv.isAarch64) "-lpython2.7";
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.isDarwin "-ObjC"
+    + lib.optionalString (stdenv.isDarwin && stdenv.isAarch64) " -lpython2.7";
 
   installPhase = "installPhase";