FAQ 8.49 How do I add a directory to my include path (@INC) at runtime?


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This is an excerpt from the latest version perlfaq8.pod, which
comes with the standard Perl distribution. These postings aim to
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to review and update the answers. The latest version of the complete
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8.49: 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 "lib" pragma:
use lib "$ENV{HOME}/myown_perllib";

the "local::lib" module:
use local::lib;

use local::lib "~/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.


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