Man pages matching name extutils::makemaker::cpanfile in section 3pm:

ExtUtils::MakeMaker::CPANfile.3pm.en	debian 10 / libextutils-makemaker-cpanfile-perl
ExtUtils::MakeMaker::CPANfile.3pm.en	debian 11 / libextutils-makemaker-cpanfile-perl
ExtUtils::MakeMaker::CPANfile.3pm.en	debian 12 / libextutils-makemaker-cpanfile-perl