YPBINDVERS_2
if (!svc_reg(transp, YPBINDPROG, YPBINDVERS_2,
(void) rpcb_unset(YPBINDPROG, YPBINDVERS_2, nconf);
if (!svc_reg(xprt, YPBINDPROG, YPBINDVERS_2,
cache_transport(nconf, xprt, YPBINDVERS_2);
rpcb_unset(YPBINDPROG, YPBINDVERS_2, 0);