How do I add a directory to my include path at runtime?

            Here are the suggested ways of modifying your include path:

                the PERLLIB environment variable
                the PERL5LIB environment variable
                the perl -Idir command line flag
                the use lib pragma, as in
                    use lib "$ENV{HOME}/myown_perllib";

            The latter is particularly useful because it knows about machine
            dependent architectures. The lib.pm pragmatic module was first
            included with the 5.002 release of Perl.