anchor.diff:        s,"flac","${flac.bin}/bin/flac",
         s,"mp3val","${mp3val}/bin/mp3val",
       }' beetsplug/badfiles.py
  +  '' + optionalString enableConvert ''
  +    sed -i -e 's,\(util\.command_output(\)\([^)]\+\)),\1[b"${ffmpeg.bin}/bin/ffmpeg" if args[0] == b"ffmpeg" else args[0]] + \2[1:]),' beetsplug/convert.py 
     '' + optionalString enableReplaygain ''
       sed -i -re '
         s!^( *cmd *= *b?['\'''"])(bs1770gain['\'''"])!\1${bs1770gain}/bin/\2!
  
positive.code:     acousticbrainz = enableAcousticbrainz;
      badfiles = enableBadfiles;
      chroma = enableAcoustid;
      discogs = enableDiscogs;
      echonest = enableEchonest;
      embyupdate = enableEmbyupdate;
  
negative.code:               || enableEmbyupdate
                || enableAcousticbrainz)
                                     pythonPackages.requests2
      ++ optional enableConvert      ffmpeg
      ++ optional enableDiscogs      pythonPackages.discogs_client
      ++ optional enableEchonest     pythonPackages.pyechonest
      ++ optional enableLastfm       pythonPackages.pylast
  