anchor.diff:      "--disable-maintainer-mode"
       "--${boolEn (gobject-introspection != null)}-introspection"
       "--disable-glibtest"
  -    "--${boolEn (vala != null)}-vala"
  +    "--${boolWt (vala != null)}-vala"
       "--without-mrg"
       "--${boolWt (gexiv2 != null)}-gexiv2"
       "--${boolWt (cairo != null)}-cairo"
  
positive.code:     babl
      cairo
      exiv2
      ffmpeg
      gdk-pixbuf
      gexiv2
      glib
  
negative.code: , libpng
  , libraw
  , librsvg
  , libspiro
  , libtiff
  , libwebp
  , openexr
  