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