Here's a few things you can try: 
PERL_MM_USE_DEFAULT=1; export PERL_MM_USE_DEFAULT
AUTOMATED_TESTING=1; export AUTOMATED_TESTING
perl Makefile.PL < /dev/null
make < /dev/null
make test < /dev/null
make install < /dev/null

[download]
or similar, 'man CPAN' for details. I don't recall where I got AUTOMATED_TESTING from.
(Later) See http://wiki.cpantesters.org/wiki/CPANAuthorNotes for AUTOMATED_TESTING.

In reply to Re: simpler way to silence modules that ask install-time questions by djp
in thread simpler way to silence modules that ask install-time questions by perrin

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