You can check @INC using a one-liner:

perl -e 'print join "\n", @INC';
[download]

Or simply run:

perl -V
[download]

The "." stands for the current directory; hence, it will always come last in the list. Here's a little snippet that I used a couple of years ago. I was experimenting with chromatic's Modern::Perl. It'll enable strict, warnings, and features.

#!perl

use Modern::Perl;
use File::PathList;
use Data::Dumper::Concise;

my $inc = File::PathList->new( paths => \@INC );
say Dumper $inc;
[download]

That was just to satisfy my obsession with Dumper:). You should also check to make sure that perl's in your path.