anchor.diff:  , sqlite
   , systemd_lib
   #, twolame
  -#, wavpack
  +, wavpack
   , yajl
   , zlib
   , zziplib
  
positive.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)
  
negative.code:     soxr
      sqlite
      systemd_lib
      wavpack
      yajl
      zlib
      zziplib
  