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-rw-r--r--pkgs/development/python2-modules/pygtk/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/python2-modules/pygtk/default.nix b/pkgs/development/python2-modules/pygtk/default.nix
index de0a0a282cf..95447127ad0 100644
--- a/pkgs/development/python2-modules/pygtk/default.nix
+++ b/pkgs/development/python2-modules/pygtk/default.nix
@@ -37,7 +37,7 @@ buildPythonPackage rec {
 
   buildPhase = "buildPhase";
 
-  NIX_CFLAGS_COMPILE = lib.optional stdenv.isDarwin "-ObjC"
+  env.NIX_CFLAGS_COMPILE = lib.optional stdenv.isDarwin "-ObjC"
     ++ lib.optional (stdenv.isDarwin && stdenv.isAarch64) "-lpython2.7";
 
   installPhase = "installPhase";