anchor.diff:  
   in buildPythonApplication rec {
     name = "beets-${version}";
  -  version = "1.3.17";
  +  version = "1.3.19";
     namePrefix = "";
   
     src = fetchFromGitHub {
       owner = "sampsyo";
       repo = "beets";
       rev = "v${version}";
  -    sha256 = "1fskxx5xxjqf4xmfjrinh7idjiq6qncb24hiyccv09l47fr1yipc";
  +    sha256 = "0f2v1924ryx5xijpv1jycanl4471vcd7c5lld58lm0viyvh5k28x";
     };
   
     propagatedBuildInputs = [
  
positive.code:     chroma = enableAcoustid;
      convert = enableConvert;
      discogs = enableDiscogs;
      echonest = enableEchonest;
      embyupdate = enableEmbyupdate;
      fetchart = enableFetchart;
      lastgenre = enableLastfm;
  
negative.code: , enableBadfiles       ? true, flac ? null, mp3val ? null
  , enableConvert        ? true, ffmpeg ? null
  , enableDiscogs        ? true
  , enableEmbyupdate     ? true
  , enableFetchart       ? true
  , enableLastfm         ? true
  