luaPackages.nfd: fix build on darwin

pkgs/development/lua-modules/nfd/default.nix

···
-{ fetchFromGitHub, buildLuarocksPackage, lua, pkg-config, lib
-, substituteAll, zenity }:
+{ stdenv, fetchFromGitHub, buildLuarocksPackage, lua, pkg-config, lib
+, substituteAll, zenity, AppKit }:
 
 buildLuarocksPackage {
   pname = "nfd";
···
 
   extraVariables.LUA_LIBDIR = "${lua}/lib";
   nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = lib.optionals stdenv.isDarwin [ AppKit ];
 
   fixupPhase = ''
     find $out -name nfd_zenity.so -execdir mv {} nfd.so \;

pkgs/top-level/lua-packages.nix

···
 
   nfd = callPackage ../development/lua-modules/nfd {
     inherit (pkgs.gnome) zenity;
+    inherit (pkgs.darwin.apple_sdk.frameworks) AppKit;
   };
 
   vicious = (callPackage ({ fetchFromGitHub }: stdenv.mkDerivation rec {