If we don't have /usr/sbin/mtree, try to mount /usr. We're only likely

to hit this case when /usr is remote and thus hasn't been mounted (since
you're supposed to have /var before mounting remote file systems).
Normal machines that don't have a /var for some reason will have /usr
already available because it's local.

etc/rc.d/var

@@ -83,10 +83,19 @@ case "${populate_var}" in
 *)
 	if [ -d /var/run -a -d /var/db -a -d /var/empty ] ; then
 		true
-	elif [ ! -x /usr/sbin/mtree ] ; then
-		false
-	else
+	elif [ -x /usr/sbin/mtree ] ; then
 		_populate_var
+	else
+		# We need mtree to populate /var so try mounting /usr.
+		# If this does not work, we can not boot so it is OK to
+		# try to mount out of order.
+		mount /usr
+		if [ ! -x /usr/sbin/mtree ] ; then
+			exit 1
+		else
+			_populate_var
+		fi
+	else
 	fi
 	;;
 esac