anchor.diff:    xquartz = callPackage ../servers/x11/xquartz { };
     quartz-wm = callPackage ../servers/x11/quartz-wm {
       stdenv = clangStdenv;
  +    inherit (darwin.apple_sdk.frameworks) Foundation;
  +    inherit (darwin.apple_sdk.libs) Xplugin;
  +    inherit (darwin) libobjc cf-private;
     };
   
     xorg = recurseIntoAttrs (lib.callPackagesWith pkgs ../servers/x11/xorg/default.nix {
  
positive.code: 
    darwin = let
      cmdline = callPackage ../os-specific/darwin/command-line-tools {};
      apple-source-releases = import ../os-specific/darwin/apple-source-releases {
        inherit stdenv fetchurl pkgs;
      };
    in apple-source-releases // rec {
      cctools_cross = callPackage (forceNativeDrv (callPackage ../os-specific/darwin/cctools/port.nix {}).cross) {
        cross = assert crossSystem != null; crossSystem;
  
negative.code:     cmdline_sdk   = cmdline.sdk;
      cmdline_tools = cmdline.tools;
  
      apple_sdk = callPackage ../os-specific/darwin/apple-sdk {
        inherit (darwin) CF;
      };
  
  