anchor.diff:                || enableEmbyupdate
                 || enableAcousticbrainz)
                                      pythonPackages.requests2
  +    ++ optional enableConvert      ffmpeg
       ++ optional enableDiscogs      pythonPackages.discogs_client
       ++ optional enableEchonest     pythonPackages.pyechonest
       ++ optional enableLastfm       pythonPackages.pylast
  
positive.code:       s,"flac","${flac.bin}/bin/flac",
        s,"mp3val","${mp3val}/bin/mp3val",
      }' beetsplug/badfiles.py
    '' + optionalString enableReplaygain ''
      sed -i -re '
        s!^( *cmd *= *b?['\'''"])(bs1770gain['\'''"])!\1${bs1770gain}/bin/\2!
  
negative.code:   };
  
    pluginsWithoutDeps = [
      "bench" "bpd" "bpm" "bucket" "cue" "duplicates" "edit" "embedart"
      "filefilter" "freedesktop" "fromfilename" "ftintitle" "fuzzy" "ihate"
      "importadded" "importfeeds" "info" "inline" "ipfs" "keyfinder" "lyrics"
      "mbcollection" "mbsubmit" "mbsync" "metasync" "missing" "permissions" "play"
  