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: ExtUtils::CBuilder, ExtUtils::CBuilder::Base, ExtUtils::CBuilder::Platform::Unix, ExtUtils::CBuilder::Platform::VMS, ExtUtils::CBuilder::Platform::Windows::BCC, ExtUtils::CBuilder::Platform::Windows::GCC, ExtUtils::CBuilder::Platform::Windows::MSVC, ExtUtils::CBuilder::Platform::aix, ExtUtils::CBuilder::Platform::android, ExtUtils::CBuilder::Platform::cygwin, ExtUtils::CBuilder::Platform::darwin, ExtUtils::CBuilder::Platform::dec_osf, ExtUtils::CBuilder::Platform::os2

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

Error: 0.280216,0.280217

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.