How do I add a directory to my include path (@INC) at runtime?

How do I add a directory to my include path (@INC) at runtime?

Here are the suggested ways of modifying your include path, including environment variables, run-time switches, and in-code statements:

• the PERLLIB environment variable

  	$ export PERLLIB=/path/to/my/dir
  	$ perl program.pl

• the PERL5LIB environment variable

  	$ export PERL5LIB=/path/to/my/dir
  	$ perl program.pl

• the perl -Idir command line flag

  	$ perl -I/path/to/my/dir program.pl

• the use lib pragma:

  	use lib "$ENV{HOME}/myown_perllib";

The last 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.