anchor.diff:  
       pango cairo gdk_pixbuf atk gtk glib
   
  -    ffmpeg_1 libvpx x264 libwebp
  +    ffmpeg libvpx x264 libwebp
     ];
   
  -  propagatedBuildInputs = [ 
  +  propagatedBuildInputs = [
       pil pygtk pygobject
     ];
   
  
positive.code: { stdenv, fetchurl, buildPythonPackage
  , python, cython, pkgconfig
  , xorg, gtk, glib, pango, cairo, gdk_pixbuf, pygtk, atk, pygobject, pycairo
  , ffmpeg_1, x264, libvpx, pil, libwebp }:
  
  buildPythonPackage rec {
    name = "xpra-0.9.5";
    
    src = fetchurl {
      url = "http://xpra.org/src/${name}.tar.bz2";
      sha256 = "1qr9gxmfnkays9hrw2qki1jdkyxhbbkjx71gy23x423cfsxsjmiw";
    };
  
    buildInputs = [ 
      python cython pkgconfig 
  
      xorg.libX11 xorg.renderproto xorg.libXrender xorg.libXi xorg.inputproto xorg.kbproto
      xorg.randrproto xorg.damageproto xorg.compositeproto xorg.xextproto xorg.recordproto
  
negative.code:     NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE $(pkg-config --cflags gtk+-2.0) $(pkg-config --cflags pygtk-2.0) $(pkg-config --cflags xtst)"
      python ./setup.py build --enable-Xdummy
    '';
  
    meta = {
      homepage = http://xpra.org/;
      description = "Persistent remote applications for X";
  