I don't understand why?

If you look inside Makefile.PL you will see it uses, ExtUtils::MakeMaker

ExtUtils::MakeMaker lists many options like INSTALL_BASE ... which can be specified in different ways

RTFM to the rescue again

In reply to Re: default install directory for modules ( ExtUtils::MakeMaker ) by Anonymous Monk
in thread default install directory for modules by niqola

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