OL_ARG_ENABLE(dnssrv,[ --enable-dnssrv enable dnssrv backend],
no, [no yes mod], ol_enable_backends)dnl
OL_ARG_ENABLE(hdb,[ --enable-hdb enable Hierarchical DB backend],
OL_ARG_ENABLE(dnssrv,[ --enable-dnssrv enable dnssrv backend],
no, [no yes mod], ol_enable_backends)dnl
OL_ARG_ENABLE(hdb,[ --enable-hdb enable Hierarchical DB backend],