anchor.diff:    meta = {
       homepage = http://xpra.org/;
       description = "Persistent remote applications for X";
  -    platforms = stdenv.lib.platforms.linux;
  -    maintainers = with stdenv.lib.maintainers; [ tstrobel ];
  +    platforms = platforms.linux;
  +    maintainers = with maintainers; [ tstrobel offline ];
     };
   }
  
positive.code: 
      ffmpeg libvpx x264 libwebp
  
      makeWrapper
    ];
  
    propagatedBuildInputs = with pythonPackages; [
      pillow pygtk pygobject2 rencode pycrypto cryptography pycups lz4 dbus-python
    ];
  
    preBuild = ''
  
negative.code: { stdenv, lib, fetchurl, pythonPackages, pkgconfig
  , xorg, gtk2, glib, pango, cairo, gdk_pixbuf, atk
  , makeWrapper, xkbcomp, xorgserver, getopt, xauth, utillinux, which, fontsConf, xkeyboard_config
  , ffmpeg, x264, libvpx, libwebp
  , libfakeXinerama
  , gst_all_1, pulseaudioLight, gobjectIntrospection }:
  
  with lib;
  
  let
    inherit (pythonPackages) python cython buildPythonApplication;
  