it's not libc6, it's just a syntax error in my post.

Try

# dpkg --force-depends -i perl-base_5.8.8-11_armel.deb

instead. The -i switch must come directly before what's to be installed.
My bad. See how it's trying to install something called .force-depends? It misses the hook and therefore bombs the whole thing.

And installing a new version of libc6 might be VERY hard. I remember getting into a horrible dependency hell trying to update c libs for some reason on another system.

You will also want to edit /var/lib/dpkg/status afterwards. Read more about it at my little 770 hax site (in my signature)