anchor.diff:  { stdenv
   , fetchurl
  -, python
  +, pythonPackages
   
   , aalib
   , bzip2
  
positive.code:     (enFlag "wavpack" (wavpack != null) null)
      (enFlag "zlib" (zlib != null) null)
      (enFlag "bz2" (bzip2 != null) null)
      (wtFlag "--with-gudev" (libgudev != null) null)
      (wtFlag "--with-libv4l2" (v4l_lib != null) null)
    ];
  
    meta = with stdenv.lib; {
  
negative.code: in
  
  stdenv.mkDerivation rec {
    name = "gst-plugins-good-1.8.2";
  
    src = fetchurl rec {
      url = "https://gstreamer.freedesktop.org/src/gst-plugins-good/${name}.tar.xz";
      sha256Url = "${url}.sha256sum";
      sha256 = "8d7549118a3b7a009ece6bb38a05b66709c551d32d2adfd89eded4d1d7a23944";
    };
  
    nativeBuildInputs = [
      pythonPackages.python
    ];
  
    buildInputs = [
  