anchor.diff:        (mkFlag aacSupport "aac")
         (mkFlag pulseaudioSupport "pulse")
         (mkFlag stdenv.isDarwin "osx")
  -      "--enable-debugging" ]
  +      "--enable-debug"
  +    ]
       ++ opt stdenv.isLinux
         "--with-systemdsystemunitdir=$(out)/etc/systemd/system";
   
  
positive.code: , shoutSupport ? true, libshout
  , sqliteSupport ? true, sqlite
  , curlSupport ? true, curl
  , soupSupport ? true, libsoup
  , audiofileSupport ? true, audiofile
  , bzip2Support ? true, bzip2
  , ffadoSupport ? true, ffado
  , ffmpegSupport ? true, ffmpeg
  , fluidsynthSupport ? true, fluidsynth
  , zipSupport ? true, zziplib
  
negative.code:     ++ opt shoutSupport libshout
      ++ opt sqliteSupport sqlite
      ++ opt curlSupport curl
      ++ opt bzip2Support bzip2
      ++ opt audiofileSupport audiofile
      ++ opt ffmpegSupport ffmpeg
      ++ opt fluidsynthSupport fluidsynth
      ++ opt samplerateSupport libsamplerate
  