diff --git a/default.nix b/default.nix
index 0ec400c..a89015e 100644
--- a/default.nix
+++ b/default.nix
@@ -22,7 +22,14 @@ let
     '';
     pkgConfig = {
       node-sass = {
-        buildInputs = [ pkgs.python pkgs.libsass pkgs.pkgconfig ];
+        buildInputs = with pkgs; [
+          which
+          python2
+          libsass
+          pkgconfig
+        ] ++ pkgs.lib.optionals pkgs.stdenv.isDarwin [
+          xcodebuild
+        ];
         postInstall = ''
           LIBSASS_EXT=auto yarn --offline run build
           rm build/config.gypi