anchor.diff:      soxr
       sqlite
       systemd_lib
  -    #wavpack
  +    wavpack
       yajl
       zlib
       zziplib
  
positive.code: , sqlite
  , systemd_lib
  #, twolame
  #, wavpack
  , yajl
  , zlib
  , zziplib
  
negative.code:     (enFlag "vorbis-encoder" (libvorbis != null) null)
      (enFlag "wave-encoder" true null)
      # FIXME: wavpack support
      (enFlag "wavpack" (wavpack != null) null)
      (wtFlag "zeroconf" (avahi != null && dbus != null) "avahi")
      (enFlag "zlib" (zlib != null) null)
      (enFlag "zzip" (zziplib != null) null)
  