anchor.diff: -{ stdenv, fetchurl, pkgconfig, spice_protocol, intltool, celt_0_5_1
  +{ stdenv, fetchurl, pkgconfig, spice_protocol, gettext, celt_0_5_1
   , openssl, libpulseaudio, pixman, gobjectIntrospection, libjpeg_turbo, zlib
   , cyrus_sasl, python2Packages, autoreconfHook, usbredir, libsoup
   , gtk3, epoxy }:
  
positive.code:     libjpeg_turbo zlib cyrus_sasl python pygtk usbredir gtk3 epoxy
    ];
  
    nativeBuildInputs = [ pkgconfig intltool libsoup autoreconfHook ];
  
    NIX_CFLAGS_COMPILE = "-fno-stack-protector";
  
    preAutoreconf = ''
      substituteInPlace src/Makefile.am \
            --replace '=codegendir pygtk-2.0' '=codegendir pygobject-2.0'
    '';
  
    preConfigure = ''
      intltoolize -f
    '';
  
    configureFlags = [
  
negative.code: let
    inherit (python2Packages) python pygtk;
  in stdenv.mkDerivation rec {
    name = "spice-gtk-0.34";
  
    src = fetchurl {
      url = "http://www.spice-space.org/download/gtk/${name}.tar.bz2";
      sha256 = "1vknp72pl6v6nf3dphhwp29hk6gv787db2pmyg4m312z2q0hwwp9";
    };
  
    buildInputs = [
  