anchor.diff:  , libexif
   , libgee
   , libgsf
  +, libgxps
   , libjpeg
  +, libmediaart
   , libnotify
  +, libosinfo
   , libpng
   , librsvg
   , libtiff
  
positive.code:     gdk-pixbuf
      giflib
      glib
      gsettings-desktop-schemas
      libgee
      totem-pl-parser
  
negative.code:     "--enable-cfg-man-pages"
      "--enable-unzip-ps-gz-files"
      (enFlag "poppler" (poppler != null) null)
      (enFlag "libgxps" (libgxps != null) null)
      (enFlag "libgsf" (libgsf != null) null)
      (enFlag "libosinfo" (libosinfo != null) null)
      (enFlag "libgif" (giflib != null) null)
      (enFlag "libjpeg" (libjpeg != null) null)
      (enFlag "libtiff" (libtiff != null) null)
  