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 =head1 LICENSE and/or the proper text of the well-known license to the main module in your code.

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: Device::Gsm, Device::Gsm::Charset, Device::Gsm::Pdu, Device::Gsm::Sms, Device::Gsm::Sms::Structure, Device::Gsm::Sms::Token, Device::Gsm::Sms::Token::DA, Device::Gsm::Sms::Token::DCS, Device::Gsm::Sms::Token::DT, Device::Gsm::Sms::Token::MR, Device::Gsm::Sms::Token::OA, Device::Gsm::Sms::Token::PDUTYPE, Device::Gsm::Sms::Token::PID, Device::Gsm::Sms::Token::SCA, Device::Gsm::Sms::Token::SCTS, Device::Gsm::Sms::Token::ST, Device::Gsm::Sms::Token::UD, Device::Gsm::Sms::Token::UDH, Device::Gsm::Sms::Token::VP

Fix the version numbers so that version::is_lax($version) returns true.

Error:

• lib/Device/Gsm/Charset.pm: HASH(0x55a441623dd8)

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.