optional_depends "%SSL"                                 \
                 "--enable-ssl"                         \
                 "--disable-ssl"                        \
                 "for SSL/TLS support"

optional_depends "zlib"                                 \
                 "--disable-localzlib"                  \
                 "--enable-localzlib"                   \
                 "use system ZLIB instead of htmldoc's"

optional_depends "%JPEG"                                \
                 "--disable-localjpeg"                  \
                 "--enable-localjpeg"                   \
                 "use system JPEG instead of htmldoc's"

optional_depends "libpng"                               \
                 "--disable-localpng"                   \
                 "--enable-localpng"                    \
                 "use system PNG instead of htmldoc's"

optional_depends "fltk"                                 \
                 "--with-gui"                           \
                 "--without-gui"                        \
                 "for the GUI"
