autotrace: fix darwin build

pkgs/applications/graphics/autotrace/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchurl, callPackage, libpng12, imagemagick,
-  autoreconfHook, glib, pstoedit, pkgconfig, gettext, darwin }:
+  autoreconfHook, glib, pstoedit, pkgconfig, gettext, gd, darwin }:
 
 # TODO: Figure out why the resultant binary is somehow linked against
 # libpng16.so.16 rather than libpng12.
@@ -36,8 +36,8 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ autoreconfHook glib autofig pkgconfig gettext ];
   buildInputs = [ libpng12 imagemagick pstoedit ]
     ++ stdenv.lib.optionals stdenv.isDarwin
-       (with darwin.apple_sdk.frameworks; [ApplicationServices]);
-    
+       (with darwin.apple_sdk.frameworks; [ gd ApplicationServices ]);
+
   postUnpack = ''
     pushd $sourceRoot
     autofig autotrace-config.af