anchor.diff:  { stdenvNoCC
   , fetchurl
  -, pkgconfig
   , rpmextract
   , undmg
   , darwin
  +, validatePkgConfig
   , enableStatic ? false
   }:
   
  
positive.code:     install_name_tool -change @rpath/libtbbmalloc.dylib $out/lib/libtbbmalloc.dylib $out/lib/libtbbmalloc_proxy.dylib
    '';
  
    # Validate pkgconfig files, since they break often on updates.
    installCheckPhase = ''
      pkg-config --validate $out/lib/pkgconfig/*.pc
    '';
  
    # Per license agreement, do not modify the binary
    dontStrip = true;
    dontPatchELF = true;
  
negative.code:         sha256 = "0v86hrqg15mbc78m9qk8dbkaaq3mlwashgbf9n79kxpl1gilnah8";
        });
  
    nativeBuildInputs = [ validatePkgConfig ] ++ (if stdenvNoCC.isDarwin
      then
        [ undmg darwin.cctools ]
      else
        [ rpmextract ]);
  
    buildPhase = if stdenvNoCC.isDarwin then ''
      for f in Contents/Resources/pkg/*.tgz; do
  