Intalling dev-perl/Module-Build-Tiny-0.39.0 and dev-perl/namespace-autoclean-0.240.0 emerge prints the same message: The ebuild uses Module::Build but doesn't depend on it. Add virtual/perl-Module-Build to DEPEND! Reproducible: Always
That's a QA Notice. And its not correct because the correct Dep is for Module::Build::Tiny. But its a known issue that should hopefully be resolved by my proposed patch in bug #495044 *** This bug has been marked as a duplicate of bug 495044 ***