Merge pull request #312696 from eliandoran/darwin/tkimg

tkimg: fix build on darwin

pkgs/development/libraries/tkimg/default.nix

@@ -1,4 +1,4 @@
-{ lib, fetchsvn, tcl, tcllib, tk, xorg }:
+{ stdenv, lib, fetchsvn, tcl, tcllib, tk, xorg, darwin }:
 
 tcl.mkTclDerivation rec {
   pname = "tkimg";
@@ -16,7 +16,9 @@ tcl.mkTclDerivation rec {
     "--with-tkinclude=${tk.dev}/include"
   ];
 
-  buildInputs = [ xorg.libX11 tcllib ];
+  buildInputs = [ xorg.libX11 tcllib ] ++ lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
+    Cocoa
+  ]);
 
   meta = {
     homepage = "https://sourceforge.net/projects/tkimg/";