anchor.diff:      discogs = enableDiscogs;
       embyupdate = enableEmbyupdate;
       fetchart = enableFetchart;
  +    gmusic = enableGmusic;
       keyfinder = enableKeyfinder;
  +    kodiupdate = enableKodiupdate;
       lastgenre = enableLastfm;
       lastimport = enableLastfm;
       mpdstats = enableMpd;
  
positive.code: 
  in pythonPackages.buildPythonApplication rec {
    name = "beets-${version}";
    version = "1.4.3";
  
    src = fetchFromGitHub {
      owner = "beetbox";
      repo = "beets";
      rev = "v${version}";
      sha256 = "0sh2ap7jbqh7p8h63kgrx1ja9lyqlxjpfnh6axxw9p1mh78cgc1v";
    };
  
    propagatedBuildInputs = [
  
negative.code: , enableDiscogs        ? true
  , enableEmbyupdate     ? true
  , enableFetchart       ? true
  , enableGmusic         ? true
  , enableKeyfinder      ? true, keyfinder-cli ? null
  , enableKodiupdate     ? true
  , enableLastfm         ? true
  , enableMpd            ? true
  , enableReplaygain     ? true, bs1770gain ? null
  