anchor.diff:      (fstat withDynamic        "DYNAMIC")
       (fstat withDevices        "DEVICES_SUPPORT")
       (fstat withHttpServer     "HTTP_SERVER")
  +    (fstat withLibVlc         "LIBVLC")
       (fstat withStreams        "STREAMS")
       (fstat withUdisks         "UDISKS2")
       "-DENABLE_HTTPS_SUPPORT=ON"
  
positive.code:   cmakeFlags = lib.flatten [
      (fstats withTaglib        [ "TAGLIB" "TAGLIB_EXTRAS" ])
      (fstats withReplaygain    [ "FFMPEG" "MPG123" "SPEEXDSP" ])
      (fstat withCdda           "CDPARANOIA")
      (fstat withCddb           "CDDB")
      (fstat withLame           "LAME")
  
negative.code: , withMusicbrainz ? false, libmusicbrainz5
  
  , withTaglib ? true, taglib, taglib_extras
  , withHttpStream ? true, qtmultimedia
  , withReplaygain ? true, ffmpeg, speex, mpg123
  , withMtp ? true, libmtp
  , withOnlineServices ? true
  , withDevices ? true, udisks2
  , withDynamic ? true
  , withHttpServer ? true
  , withLibVlc ? false, vlc
  , withStreams ? true
  }:
  
  