anchor.diff:  { stdenv
   , fetchurl
  -, python
  +, pythonPackages
   
   , bzip2
   , curl
  
positive.code: 
    postPatch =
      /* tests are slower than upstream expects */ ''
      	sed -e 's:/\* tcase_set_timeout.*:tcase_set_timeout (tc_chain, 5 * 60);:' \
      		-i tests/check/elements/audiomixer.c
      '';
  
    configureFlags = [
  
negative.code: in
  
  stdenv.mkDerivation rec {
    name = "gst-plugins-bad-1.8.2";
  
    src = fetchurl rec {
      url = "https://gstreamer.freedesktop.org/src/gst-plugins-bad/${name}.tar.xz";
      sha256Url = "${url}.sha256sum";
      sha256 = "d7995317530c8773ec088f94d9320909d41da61996b801ebacce9a56af493f97";
    };
  
    nativeBuildInputs = [
      pythonPackages.python
    ];
  
    buildInputs = [
  