It's failing at ``Writing Makefile for Crypt::PasswdMD5'', which sounds like a permissions problem. Check that everything under /root/.cpan/ is owned by the appropriate person, especially /root/.cpan/build and /root/.cpan/build/Crypt-PasswdMD5-1.2. Then try again. If all else fails, blow away the /root/.cpan directory altogether and retry.

BTW, your filesystem isn't full, is it?
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Bitt Faulk