depends  JPEG    &&
depends  libpng  &&
depends  libxi   &&
depends  rman    &&
depends  xaw3d   &&
depends  zlib    &&

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

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

optional_depends  "transfig"                     \
                  ""                             \
                  ""                             \
                  "to export to various formats" 
