anchor.diff:  
     src = fetchurl {
       url = "https://webkitgtk.org/releases/${name}.tar.xz";
  -    sha256 = "1n0dy94bm7wvxln4jis1gp8plv8n4a01g41724zsf5psg1yk16sp";
  +    sha256 = "0cmfjbfxssgrwhgqmk7kqws91k6pha519bnyjrfsgy640max2zfc";
     };
   
     patches = optionals stdenv.isDarwin [
  
positive.code: with stdenv.lib;
  stdenv.mkDerivation rec {
    name = "webkitgtk-${version}";
    version = "2.20.3";
  
    meta = {
      description = "Web content rendering engine, GTK+ port";
  
negative.code: 
    postPatch = ''
      patchShebangs .
    '';
  
    cmakeFlags = [
  