anchor.diff:  { fetchurl, stdenv, dpkg, xlibs, qt4, alsaLib, makeWrapper, openssl, freetype
   , glib, pango, cairo, atk, gdk_pixbuf, gtk, cups, nspr, nss, libpng, GConf
  -, libgcrypt, chromium, sqlite, gst_plugins_base, gstreamer, udev, fontconfig
  +, libgcrypt, chromium, udev, fontconfig
   , dbus, expat }:
   
   assert stdenv.system == "i686-linux" || stdenv.system == "x86_64-linux";
  
positive.code:     GConf
      gdk_pixbuf
      glib
      gst_plugins_base
      gstreamer
      gtk
      libgcrypt
      libpng
      nss
      pango
      qt4
      sqlite
      stdenv.cc.gcc
      xlibs.libX11
      xlibs.libXcomposite
  
negative.code:     xlibs.libXrender
      xlibs.libXrender
      xlibs.libXScrnSaver
    ];
  
  in
  