cpan> install Crypt::OpenPGP
Running install for module Crypt::OpenPGP
Running make for B/BT/BTROTT/Crypt-OpenPGP-1.03.tar.gz
Fetching with LWP:
  ..
about 50 more dependencies later...

  CPAN.pm: Going to build B/BT/BTROTT/Convert-PEM-0.07.tar.gz

*** ExtUtils::AutoInstall version 0.56
*** Checking for dependencies...
[Core Features]
- Class::ErrorHandler ...missing.
- MIME::Base64        ...loaded. (3.05)
- Convert::ASN1       ...missing. (would need 0.10)
- Digest::MD5         ...loaded. (2.33)
- Crypt::DES_EDE3     ...missing.