Subject: | Makefile.PL should not _check_ for installed modules |
Makefile.PL should only declare dependent modules (through PREREQ_PM), but never check if these are really available. Doing so prevents an installer like CPAN.pm from automatic installation of dependencies.
This probably explains all the "unknown" reports at CPAN Testers, see http://matrix.cpantesters.org/?dist=DBIx-DBStag%200.12