anchor.diff:        langGo
         langObjC
         langObjCpp
  +      langJit
         ;
     };
   
  
positive.code: 
    inherit patches;
  
    outputs = [ "out" "lib" "man" "info" ];
    setOutputFlags = false;
    NIX_NO_SELF_RPATH = true;
  
  
negative.code: , langObjCpp ? stdenv.targetPlatform.isDarwin
  , langGo ? false
  , profiledCompiler ? false
  , langJit ? false
  , staticCompiler ? false
  , enableShared ? true
  , enableLTO ? true
  