Thanks for correcting me. I saw the build action didn't regenerate META.yml, so assumed incorrectly that a way for Build.PL to indicate requirements to an external tool. I see now that the distmeta action does this (the "dist" prefix had made me think it was something that should only be done as part of preparing a distribution), or you can do what CPANPLUS does after running the build action: 
my $build = Module::Build->resume(
    properties => {
        config_dir      => File::Spec->catdir($args->{'dir'}, "_build"
+),
        build_script    => 'Build',
    }
);

my $failures = $build->prereq_failures;

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In reply to Re^5: Updating distributions with Module::Build, Module::Starter, and PPM::Make by ysth
in thread Updating distributions with Module::Build, Module::Starter, and PPM::Make by jacques

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