in reply to Re: Re: Re: Re: Find file name
in thread Find file name

It just passes the PREFIX to the Makefile.PL when the module is being built automatically, as described in the manpage: 
makepl_arg         arguments passed to 'perl Makefile.PL

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Which allows you to install module via CPAN to a user-defined path.
HTH

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In Section Seekers of Perl Wisdom