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:   };
    python27 = callPackage ../development/interpreters/python/2.7 {
      self = python27;
      inherit (darwin) CF configd;
    };
    python32 = callPackage ../development/interpreters/python/3.2 {
      self = python32;
  
negative.code:     self = python33;
    };
    python34 = hiPrio (callPackage ../development/interpreters/python/3.4 {
      self = python34;
    });
    python35 = hiPrio (callPackage ../development/interpreters/python/3.5 {
      self = python35;
    });
    pypy = callPackage ../development/interpreters/pypy {
  