spaceball openpbx.org-2000_rc1 # ./configure --help |grep mysql
  --enable-mysql          Enable support for MySQL. (default=no)
  --with-app_sql_mysql    Build and install app_sql_mysql (default=yes)
  --with-cdr_mysql        Build and install cdr_mysql (default=no) (requires
                          --enable-mysql
  --with-res_config_mysql Build and install res_config_mysql (default=no)
                          (requires --enable-mysql
spaceball openpbx.org-2000_rc1 # ./configure --help |grep post
  --enable-postgresql     Enable support for PostgreSQL. (default=no)
  --with-app_sql_postgres Build and install app_sql_postgres (default=yes)
                          --enable-postgresql
                          (requires --enable-postgresql