I found it on the Perl::Configure page http://search.cpan.org/~mschilli/Perl-Configure-0.08/lib/Perl/Configure.pm. However, I guess I lucked out because I am still at 5.10.1. But I should upgrade to 5.12 as you suggested.

For now, it may be better to use sudo or su with Expect as Alexander suggested.

Thank you once again.