pangolin: fix OS X build

pkgs/development/libraries/pangolin/default.nix

···
-{ stdenv, fetchFromGitHub, cmake, pkgconfig, doxygen, mesa_noglu, glew, xorg
-, ffmpeg, python3 , libjpeg, libpng, libtiff, eigen }:
+{ stdenv, lib, fetchFromGitHub, cmake, pkgconfig, doxygen, mesa_noglu, glew
+, xorg , ffmpeg, python3 , libjpeg, libpng, libtiff, eigen
+, Carbon ? null, Cocoa ? null
+}:
 
 stdenv.mkDerivation rec {
   name = "pangolin-${version}";
···
     libpng 
     libtiff 
     eigen 
-  ];
+  ]
+  ++ lib.optionals stdenv.isDarwin [ Carbon Cocoa ];
 
   enableParallelBuilding = true;
 

pkgs/top-level/all-packages.nix

···
 
   pango = callPackage ../development/libraries/pango { };
 
-  pangolin = callPackage ../development/libraries/pangolin { };
+  pangolin = callPackage ../development/libraries/pangolin {
+    inherit (darwin.apple_sdk.frameworks) Carbon Cocoa;
+  };
 
   pangomm = callPackage ../development/libraries/pangomm {
     inherit (darwin.apple_sdk.frameworks) ApplicationServices;