depends  libpng  &&

optional_depends  xaw3d                          \
                  --with-xaw3d                   \
                  --without-xaw3d                \
                  'use Xaw3d'                    &&

optional_depends  JPEG                           \
                  --enable-jpeg                  \
                  --disable-jpeg                 \
                  'for jpeg import support'      &&

optional_depends  libxi                          \
		  --enable-tablet                \
		  --disable-tablet               \
		  'for tablet device support'    &&

optional_depends  libxpm                         \
                  --enable-xpm                   \
                  --disable-xpm                  \
                  'for XPM support'              &&

suggest_depends   xpdf                           \
                  ""                             \
                  ""                             \
                  "for a PDF viewer"             &&

suggest_depends   firefox                        \
                  ""                             \
                  ""                             \
                  "for a HTML viewer"            &&

suggest_depends   transfig                       \
                  ""                             \
                  ""                             \
                  "to export to various formats"
