Plack

This distribution does not 'use warnings;' in all of its modules.

Add 'use warnings' to all modules. (This will require perl > 5.6)

This distribution uses a module or a dist that's not listed as a prerequisite.

List all used modules in META.yml requires

This distribution does not have a list of provided modules defined in META.yml.

Add all modules contained in this distribution to the META.yml field 'provides'. Module::Build does this automatically for you.

This distribution uses a module or a dist in it's test suite that's not listed as a build prerequisite.

List all modules used in the test suite in META.yml build_requires