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: PostScript::File::Metrics::cp1252::Courier, PostScript::File::Metrics::cp1252::Courier::Bold, PostScript::File::Metrics::cp1252::Courier::BoldOblique, PostScript::File::Metrics::cp1252::Courier::Oblique, PostScript::File::Metrics::cp1252::Helvetica, PostScript::File::Metrics::cp1252::Helvetica::Bold, PostScript::File::Metrics::cp1252::Helvetica::BoldOblique, PostScript::File::Metrics::cp1252::Helvetica::Oblique, PostScript::File::Metrics::cp1252::Times::Bold, PostScript::File::Metrics::cp1252::Times::BoldItalic, PostScript::File::Metrics::cp1252::Times::Italic, PostScript::File::Metrics::cp1252::Times::Roman, PostScript::File::Metrics::iso_8859_1::Courier, PostScript::File::Metrics::iso_8859_1::Courier::Bold, PostScript::File::Metrics::iso_8859_1::Courier::BoldOblique, PostScript::File::Metrics::iso_8859_1::Courier::Oblique, PostScript::File::Metrics::iso_8859_1::Helvetica, PostScript::File::Metrics::iso_8859_1::Helvetica::Bold, PostScript::File::Metrics::iso_8859_1::Helvetica::BoldOblique, PostScript::File::Metrics::iso_8859_1::Helvetica::Oblique, PostScript::File::Metrics::iso_8859_1::Times::Bold, PostScript::File::Metrics::iso_8859_1::Times::BoldItalic, PostScript::File::Metrics::iso_8859_1::Times::Italic, PostScript::File::Metrics::iso_8859_1::Times::Roman, PostScript::File::Metrics::std::Courier, PostScript::File::Metrics::std::Courier::Bold, PostScript::File::Metrics::std::Courier::BoldOblique, PostScript::File::Metrics::std::Courier::Oblique, PostScript::File::Metrics::std::Helvetica, PostScript::File::Metrics::std::Helvetica::Bold, PostScript::File::Metrics::std::Helvetica::BoldOblique, PostScript::File::Metrics::std::Helvetica::Oblique, PostScript::File::Metrics::std::Times::Bold, PostScript::File::Metrics::std::Times::BoldItalic, PostScript::File::Metrics::std::Times::Italic, PostScript::File::Metrics::std::Times::Roman, PostScript::File::Metrics::sym::Symbol

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

Error: 2.01,2.11,2.20,2.23

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.