optional_depends  "gdbm"                                \
                  "--with-gdbm"                         \
                  "--without-gdbm"                      \
                  "for GNU database manager support"    &&
optional_depends  "gmp"                                 \
                  "--with-gmp"                          \
                  "--without-gmp"                       \
                  "for GNU mp bignum support"           &&
optional_depends  "MYSQL"                               \
                  "--with-mysql"                        \
                  "--without-mysql"                     \
                  "to support mysql database access"    &&
optional_depends  "nasm"                                \
                  ""                                    \
                  ""                                    \
                  "for x86 MMX support in Image module" &&
optional_depends  "zlib"                                \
                  "--with-zlib"                         \
                  "--without-zlib"                      \
                  "to support gz compression"           &&
optional_depends  "nettle"                              \
                  "--with-nettle"                       \
                  "--without-nettle"                    \
                  "to support crypto functions"
