If you are using Build.PL define the {requires}{perl} = VERSION field. If you are using MakeMaker (Makefile.PL) you should upgrade ExtUtils::MakeMaker to 6.48 and use MIN_PERL_VERSION parameter. Perl::MinimumVersion can help you determine which version of Perl your module needs.

Add 'use warnings' (or its equivalents) to all modules, or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.

Error: PDL::CCS, PDL::CCS::Compat, PDL::CCS::Config, PDL::CCS::Functions, PDL::CCS::IO::Common, PDL::CCS::IO::FITS, PDL::CCS::IO::FastRaw, PDL::CCS::IO::LDAC, PDL::CCS::IO::MatrixMarket, PDL::CCS::IO::PETSc, PDL::CCS::MatrixOps, PDL::CCS::Nd, PDL::CCS::Ops, PDL::CCS::Ufunc, PDL::CCS::Utils, PDL::CCS::Version

Add all modules contained in this distribution to the META.yml field 'provides'. Module::Build or Dist::Zilla::Plugin::MetaProvides do this automatically for you.

This is not a critical issue. Currently mainly informative for the CPANTS authors. It might be removed later.

Add SECURITY(.pod|md). See Software::Security::Policy.

Add SECURITY(.pod|md) and add a contact address. See Software::Security::Policy.

Add CONTRIBUTING(.pod|md). See https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/setting-guidelines-for-repository-contributors.