--- nfsmount.c.orig	2005-12-21 15:56:02.000000000 -0800
+++ nfsmount.c	2005-12-22 13:51:33.000000000 -0800
@@ -803,6 +803,10 @@ nfsmnt_check_compat(const struct pmap *n
 			mnt_pmap->pm_vers);
 		goto out_bad;
 	}
+	if ((nfs_pmap->pm_vers == 3) && (mnt_pmap->pm_vers < 3)) {
+		fprintf(stderr, _("NFS version 3 not support with mount < 3\n"));
+		goto out_bad;
+	}
 	return 1;
  out_bad:
 	return 0;