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 Sat 03 Feb 2007 09:04:45 PM JST
gpg:                using RSA key 770B3C4393B84C15
gpg: Can't check signature: No public key
==> BAD/TAMPERED signature detected! <==