anchor.diff:  
     postPatch = ''
       patchShebangs .
  -  '';
  -
  -  postConfigure = ''
  -    # A stopgap for a non-deterministic build failure when using only one core
  -    # Upstream bug: https://bugs.webkit.org/show_bug.cgi?id=183788#c4
  -    ninja JavaScriptCoreForwardingHeaders WTFForwardingHeaders
     '';
   
     cmakeFlags = [
  
positive.code: 
    src = fetchurl {
      url = "https://webkitgtk.org/releases/${name}.tar.xz";
      sha256 = "1n0dy94bm7wvxln4jis1gp8plv8n4a01g41724zsf5psg1yk16sp";
    };
  
    patches = optionals stdenv.isDarwin [
  
negative.code: with stdenv.lib;
  stdenv.mkDerivation rec {
    name = "webkitgtk-${version}";
    version = "2.20.4";
  
    meta = {
      description = "Web content rendering engine, GTK+ port";
  