What's the deal with ExtUtils::MakeMaker [build_requires] suggests that the problem may be related to BSDPAN::ExtUtils::Packlist. Perhaps this is an avenue worth investigating.

In reply to Re: cpanm installs ExtUtils::MakeMaker again and again on FreeBSD by marto
in thread cpanm installs ExtUtils::MakeMaker again and again on FreeBSD by anazawa

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