optional_depends "ImageMagick" "--with-magick"  "--without-magick"  "for ImageMagick graphics support"
optional_depends "ming"        "--with-swf"     "--without-swf"     "for flash support"
optional_depends "plotutils"   "--with-libplot" "--without-libplot" "for addtional formats support"

optional_depends "libEMF"      "--with-emf --with-libemf-include=/usr/include/libEMF" \
                               "--without-emf"          "for vector graphics support"
