anchor.diff:      pango
       sqlite
       wayland
  +  ] ++ optionals (xorg != null) [
       xorg.libX11
       xorg.libXau
       xorg.libXcomposite
  
positive.code:     zlib
    ];
  
    meta = with stdenv.lib; {
      description = "Web content rendering engine, GTK+ port";
      homepage = "http://webkitgtk.org/";
  
negative.code:     gnutls
      gst-plugins-base
      gstreamer
      gtk3
      harfbuzz
      icu
  