anchor.diff:  
     src = fetchurl {
       url = "http://webkitgtk.org/releases/${name}.tar.xz";
  -    sha256 = "0r651ar3p0f8zwl7764kyimxk5hy88cwy116pv8cl5l8hbkjkpxg";
  +    sha256 = "1xsvnvyvlywwyf6m9ainpsg87jkxjmd37q6zgz9cxb7v3c2ym2jq";
     };
   
     CC = "cc";
  
positive.code: with stdenv.lib;
  stdenv.mkDerivation rec {
    name = "webkitgtk-${version}";
    version = "2.4.9";
  
    meta = with stdenv.lib; {
      description = "Web content rendering engine, GTK+ port";
  
negative.code: 
    configureFlags = with stdenv.lib; [
      "--disable-geolocation"
      "--disable-jit"
      (optionalString enableIntrospection "--enable-introspection")
    ] ++ optional withGtk2 [
      "--with-gtk=2.0"
  