shared object "libc.so.6" not found after freebsd-update

[FT]

I was using freebsd-update to upgrade from 6.2 to 7.0-RELEASE. The upgrade
and install of the kernel went fine, then I reran freebsd-update after
rebooting to get the userland stuff. Midway through installing updates,
I got the error:

	Installing updates.../libexec/ld-elf.so.1: Shared object
	"libc.so.6" not found, required by "rm"

There's a libc.so.7 in /lib. I'd try linking to it, but ln of course 
requires libc.

Without libc, almost nothing works... can someone guide me through how
to recover a functional libc and finish updating (without breaking
everything)?

I was following the instructions at
http://www.freebsd.org/releases/7.0R/announce.html. Was there some step
missing that would have prevented this mess?

Thanks