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 a META.json to the distribution. Your buildtool should be able to autogenerate it.

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: OOP::Perlish::Class::Accessor::UnitTests::Code, OOP::Perlish::Class::Accessor::UnitTests::Constructor, OOP::Perlish::Class::Accessor::UnitTests::Object, OOP::Perlish::Class::Accessor::UnitTests::Ref, OOP::Perlish::Class::Accessor::UnitTests::Regex, OOP::Perlish::Class::Accessor::UnitTests::Scalar, OOP::Perlish::Class::Accessor::UnitTests::ScalarRef, OOP::Perlish::Class::Multiton::UnitTests::Multiton, OOP::Perlish::Class::Singleton::UnitTests::Singleton

Split the distribution, or fix the version numbers to make them consistent (use the highest version number to avoid version downgrade).

Error: 0.01,0.040000,1

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.

Add a 'repository' resource to the META.yml via 'meta_add' accessor (for Module::Build) or META_ADD parameter (for ExtUtils::MakeMaker).

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