anchor.diff:      babl
       bzip2
       cairo
  -    fixesproto
       freetype
       fontconfig
       gdk-pixbuf
  
positive.code: , poppler
  , shared-mime-info
  , xorg
  , xproto
  , xz
  , zlib
  }:
  
negative.code:     shared-mime-info
      xorg.libXmu
      xorg.libXpm
      xorgproto
      xz
      zlib
    ];
  