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:       (mkFlag shoutSupport "shout")
        (mkFlag sqliteSupport "sqlite")
        (mkFlag curlSupport "curl")
        (mkFlag soupSupport "soup")
        (mkFlag audiofileSupport "audiofile")
        (mkFlag bzip2Support "bzip2")
        (mkFlag (!stdenv.isDarwin && ffadoSupport) "ffado")
        (mkFlag ffmpegSupport "ffmpeg")
        (mkFlag fluidsynthSupport "fluidsynth")
        (mkFlag zipSupport "zzip")
  
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
  