anchor.diff:  , systemd_lib
   , taglib
   , unzip
  +, v4l_lib
   , xorg
   , xz
   , zlib
  
positive.code:     systemd_lib
      taglib
      unzip
      xorg.xcbutilkeysyms
      xorg.libXpm
      xorg.xlibsWrapper
  
negative.code:     libtiff
      libtiger
      libupnp
      libva
      libvdpau
      libvorbis
  