in reply to Re^2: how could use inc::Module::Install ever work? and other M::I questions
in thread how could use inc::Module::Install ever work? and other M::I questions

I thought you meant from the installer's perspective, not the author's. The author needs to install Module-Install which includes inc::Module::Install.

When the author runs perl Makefile.PL, it will use the system's inc::Module::Install, and it will copy inc/Module/Install.pm locally. The local copy will be included in the distribution when the author runs make dist.

This differs from ExtUtils::MakeMaker where both the author and the installer need to have ExtUtils::MakeMaker installed.

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