Changing @INC

Set the environment variable PERL5LIB or PERLLIB for all the scripts


export PERL5LIB=/path/to/lib

Adding a path to the beginning of @INC. Good for the specific script


BEGIN {
   unshift @INC, '/path/to/lib';
}

The same but with the standard tool:


use lib '/path/to/lib';           # good for the specific script

On the command line. Good for this invocation only.


perl -I /path/to/lib script.pl