You also can find more information when verifying the perlfac: $panic: perldoc -q module . here is the information you would find:

How do I keep my own module/library directory?
When you build modules, use the PREFIX option when generating Makefiles:
perl Makefile.PL PREFIX=/u/mydir/perl
then either set the PERL5LIB environment variable before you run scripts that use the modules/libraries
(see the perlrun manpage) or say use lib '/u/mydir/perl'; This is almost the same as

BEGIN {
    unshift(@INC, '/u/mydir/perl');
}
[download]

except that the lib module checks for machine-dependent subdirectories.
See Perl's the lib man-page for more information.