2.1. Loading libraries and $PERL5LIB

When you run a Perl program it looks for libraries (aka modules/packages/classes/dependencies) in the paths specified in $PERL5LIB before looking in the standard library.

$ echo $PERL5LIB
/usr/local/ddg/lib:/opt/perlbrew/libs/perl-5.26.1@mylib/lib/perl5

To load a library from a custom location modify your $PERL5LIB environment variable. For example, to always load dependencies from the lib directory in your current project:

$ export PERL5LIB=./lib:$PERL5LIB
$ echo $PERL5LIB
./lib:/usr/local/ddg/lib:/opt/perlbrew/libs/perl-5.26.1@mylib/lib/perl5

Note that order is important.