anchor.diff:      inherit (perlPackages) XMLSimple;
     };
   
  -  include-what-you-use = callPackage ../development/tools/analysis/include-what-you-use {
  -    llvmPackages = llvmPackages_37;
  -  };
  +  include-what-you-use = callPackage ../development/tools/analysis/include-what-you-use { };
   
     indent = callPackage ../development/tools/misc/indent { };
   
  
positive.code:   mesa_drivers = mesaDarwinOr (
      let mo = mesa_noglu.override {
        grsecEnabled = config.grsecurity or false;
        llvmPackages = llvmPackages_36; # various problems with 3.7; see #11367, #11467
      };
      in mo.drivers
    );
  
negative.code: 
    isocodes = callPackage ../development/libraries/iso-codes { };
  
    ispc = callPackage ../development/compilers/ispc { };
  
    itk = callPackage ../development/libraries/itk { };
  
  