Errors

use_warnings

Math::BigRat

valid_signature

Old SIGNATURE detected. Please inform the module author to regenerate SIGNATURE using Module::Signature version 0.82 or newer.
gpg: Signature made Tue 14 Sep 2010 01:31:06 AM JST
gpg:                using DSA key 742F2A428E635A5E
gpg: Can't check signature: No public key
==> BAD/TAMPERED signature detected! <==