depends g++ &&
optional_depends expat      '' '' 'XML parser' &&
optional_depends firebird   '--with-firebird --with-firebird-includes=/usr/include --with-firebird-libs=/usr/lib'  \
                            '--without-firebird' \
                            'Firebird database' &&
optional_depends ODBC-MGR   '--with-unixodbc'  '--without-unixodbc' 'ODBC data access' &&
optional_depends mysql      '--with-mysql'     '--without-mysql'    'MySQL database'    &&
optional_depends postgresql '--with-pgsql'     '--without-pgsql'    'PostgreSQL database' 

