anchor.diff:      libtiff
       libtiger
       libupnp
  -    libv4l
       libva
       libvdpau
       libvorbis
  
positive.code: , systemd_lib
  , taglib
  , unzip
  , xorg
  , xz
  , zlib
  
negative.code:     systemd_lib
      taglib
      unzip
      v4l_lib
      xorg.xcbutilkeysyms
      xorg.libXpm
      xorg.xlibsWrapper
  