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: Bio::DB::GFF, Bio::DB::GFF::Adaptor::berkeleydb, Bio::DB::GFF::Adaptor::berkeleydb::iterator, Bio::DB::GFF::Adaptor::biofetch, Bio::DB::GFF::Adaptor::biofetch_oracle, Bio::DB::GFF::Adaptor::dbi, Bio::DB::GFF::Adaptor::dbi::caching_handle, Bio::DB::GFF::Adaptor::dbi::iterator, Bio::DB::GFF::Adaptor::dbi::mysql, Bio::DB::GFF::Adaptor::dbi::mysqlcmap, Bio::DB::GFF::Adaptor::dbi::mysqlopt, Bio::DB::GFF::Adaptor::dbi::oracle, Bio::DB::GFF::Adaptor::dbi::pg, Bio::DB::GFF::Adaptor::dbi::pg_fts, Bio::DB::GFF::Adaptor::memory, Bio::DB::GFF::Adaptor::memory::feature_serializer, Bio::DB::GFF::Adaptor::memory::iterator, Bio::DB::GFF::Aggregator, Bio::DB::GFF::Aggregator::alignment, Bio::DB::GFF::Aggregator::clone, Bio::DB::GFF::Aggregator::coding, Bio::DB::GFF::Aggregator::gene, Bio::DB::GFF::Aggregator::match, Bio::DB::GFF::Aggregator::none, Bio::DB::GFF::Aggregator::orf, Bio::DB::GFF::Aggregator::processed_transcript, Bio::DB::GFF::Aggregator::so_transcript, Bio::DB::GFF::Aggregator::transcript, Bio::DB::GFF::Aggregator::ucsc_acembly, Bio::DB::GFF::Aggregator::ucsc_ensgene, Bio::DB::GFF::Aggregator::ucsc_genscan, Bio::DB::GFF::Aggregator::ucsc_refgene, Bio::DB::GFF::Aggregator::ucsc_sanger22, Bio::DB::GFF::Aggregator::ucsc_sanger22pseudo, Bio::DB::GFF::Aggregator::ucsc_softberry, Bio::DB::GFF::Aggregator::ucsc_twinscan, Bio::DB::GFF::Aggregator::ucsc_unigene, Bio::DB::GFF::Featname, Bio::DB::GFF::Feature, Bio::DB::GFF::Homol, Bio::DB::GFF::RelSegment, Bio::DB::GFF::Segment, Bio::DB::GFF::Typename

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.