Johan Lindquist enlightened us with:
> (I think that's 'mount -t proc none /mnt/gentoo/proc', btw, but I may
> be incorrect there.)

You can use that too, but as the manual page states:

The proc file system is not associated with a special device, and when
mounting it, an arbitrary keyword, such as proc can be used instead
of a device specification. (The customary choice none is less
fortunate: the error message `none busy' from umount can be
confusing.)

Sybren
--
The problem with the world is stupidity. Not saying there should be a
capital punishment for stupidity, but why don't we just take the
safety labels off of everything and let the problem solve itself?