clnt_rpcbind_create
client = clnt_rpcbind_create(host, RPCBVERS4, NULL);
static CLIENT *clnt_rpcbind_create(char *, int, struct netbuf **);
client = clnt_rpcbind_create(host, RPCBVERS, NULL);
client = clnt_rpcbind_create(host, RPCBVERS4, &targaddr);