anchor.diff:      libtheora
       libvisual
       libvorbis
  +    libx11
  +    libxext
  +    xorg.libXv
       opus
       orc
       pango
  -    xorg.libX11
  -    xorg.libXext
  -    xorg.libXv
  -    xorg.videoproto
  -    xorg.xextproto
  -    xorg.xproto
  +    videoproto
  +    xextproto
  +    xproto
       zlib
     ];
   
  
positive.code: , libtheora
  , libvisual
  , libvorbis
  , opus
  , orc
  , pango
  , xorg
  , zlib
  
  , channel
  
negative.code:     "--enable-volume"
      "--${boolEn (iso-codes != null)}-iso-codes"
      "--${boolEn (zlib != null)}-zlib"
      "--${boolEn (libx11 != null)}-x"
      "--${boolEn (xorg.libXv != null)}-xvideo"
      "--${boolEn (libxext != null)}-xshm"
      "--${boolEn (alsa-lib != null)}-alsa"
      "--${boolEn (cdparanoia != null)}-cdparanoia"
      "--disable-ivorbis"
  