anchor.diff:    llvm_35 = llvmPackages_35.llvm;
     llvm_34 = llvmPackages_34.llvm;
   
  -  llvmPackages = recurseIntoAttrs llvmPackages_4;
  +  llvmPackages = recurseIntoAttrs llvmPackages_5;
   
     llvmPackagesSelf = llvmPackages_34.override {
       stdenv = libcxxStdenv;
  
positive.code:     # makes it slower, but during runtime we link against just mesa_drivers
      # through /run/opengl-driver*, which is overriden according to config.grsecurity
      # grsecEnabled = true; # no more support in nixpkgs ATM
  
      llvmPackages = llvmPackages_5;
    });
  
    mesa_glu =  mesaDarwinOr (callPackage ../development/libraries/mesa-glu { });
  
negative.code: 
    ycmd = callPackage ../development/tools/misc/ycmd {
      inherit (darwin.apple_sdk.frameworks) Cocoa;
      python = python2;
    };
  
  