You do not need to rebuild or reconfigure the kernel to resolve this issue. A recommended fix (see https://bugs.launchpad.net/ubuntu/source/udev/bug/252924) is simply to add:
to /etc/udev/rules.d/60-symlinks.rules to cause the necessary /dev/rtc symlink to be created at boot time.
Well, I thought it worked. Installed the next BSD vm and the same error popped up. Since openSuse 11 is the host and I used "menuconfig" to make the appropiate changes wouldn't this be a fix across the board for all, new vm's?