anchor.diff:  { stdenv, fetchurl }:
   
  +let
  +  SHLIB_EXT = if stdenv.isDarwin then "dylib" else "so";
  +in
   stdenv.mkDerivation {
     name = "tbb-4.4-u2";
   
  
positive.code: 
    installPhase = ''
      mkdir -p $out/{lib,share/doc}
      cp "build/"*release*"/"*so* $out/lib/
      mv include $out/
      rm $out/include/index.html
      mv doc/html $out/share/doc/tbb
  
negative.code:       represents a higher-level, task-based parallelism that abstracts platform
        details and threading mechanisms for scalability and performance.
      '';
      platforms = with stdenv.lib.platforms; linux ++ darwin;
      maintainers = with stdenv.lib.maintainers; [ simons thoughtpolice ];
    };
  }
  