diff -up nfs-utils-1.2.0/utils/mount/configfile.c.orig nfs-utils-1.2.0/utils/mount/configfile.c
--- nfs-utils-1.2.0/utils/mount/configfile.c.orig	2009-09-30 13:57:48.647286000 -0400
+++ nfs-utils-1.2.0/utils/mount/configfile.c	2009-09-30 14:50:05.365468000 -0400
@@ -198,6 +198,15 @@ int inline check_vers(char *mopt, char *
 	}
 	return 0;
 }
+int inline vers_is_set(char *mopt)
+{
+	int i;
+
+	for (i=0; versions[i]; i++)
+		if (strncasecmp(mopt, versions[i], strlen(versions[i])) == 0)
+			return 1;
+	return 0;
+}
 /*
  * Parse the given section of the configuration 
  * file to if there are any mount options set.
@@ -256,6 +265,8 @@ conf_parse_mntopts(char *section, char *
 	conf_free_list(list);
 }
 
+int do_version_negation;
+
 /*
  * Concatenate options from the configuration file with the 
  * given options by building a link list of options from the
@@ -326,6 +337,8 @@ char *conf_get_mntopts(char *spec, char 
 		strcat(config_opts, ",");
 	}
 	SLIST_FOREACH(entry, &head, entries) {
+		if (vers_is_set(entry->opt))
+			do_version_negation = 1;
 		strcat(config_opts, entry->opt);
 		strcat(config_opts, ",");
 	}
diff -up nfs-utils-1.2.0/utils/mount/stropts.c.orig nfs-utils-1.2.0/utils/mount/stropts.c
--- nfs-utils-1.2.0/utils/mount/stropts.c.orig	2009-09-30 13:57:48.613288000 -0400
+++ nfs-utils-1.2.0/utils/mount/stropts.c	2009-09-30 14:59:56.716461000 -0400
@@ -588,6 +588,7 @@ out_fail:
 	po_destroy(options);
 	return result;
 }
+extern int do_version_negation;
 
 /*
  * This is a single pass through the fg/bg loop.
@@ -607,12 +608,20 @@ static int nfs_try_mount(struct nfsmount
 			if (errno != EPROTONOSUPPORT)
 				break;
 		}
-	case 2:
 	case 3:
+		if (do_version_negation)
+			po_remove_all(mi->options, "nfsvers");
+	case 2:
 		result = nfs_try_mount_v3v2(mi);
 		break;
 	case 4:
 		result = nfs_try_mount_v4(mi);
+		if (do_version_negation && !result) {
+			if (errno == EPROTONOSUPPORT) {
+				po_remove_all(mi->options, "nfsvers");
+				result = nfs_try_mount_v3v2(mi);
+			}
+		}
 		break;
 	default:
 		errno = EIO;