Are you "deaf" or something?

use lib '.';
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To be on the safe side, and if you plan on chdirring in your script, it's safer to do

use Cwd;
use lib cwd;
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cwd(), short for the "current working directory", is a function in Cwd that returns the absolute path for the current directory, thus ".".

More flexible still is something like

use File::Spec::Functions 'rel2abs';
use lib rel2abs('.');
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because this way it's easy to add an absolute path out of a specified relative path, say a subdirectory of the current directory:

use File::Spec::Functions 'rel2abs';
use lib rel2abs('lib');
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In general, I prefer to use the functions from File::Spec::Functions, but if you don't use it for anything else, I'd avoid the namespace pollution from importing the sub name, and use the more convoluted syntax using the methods:

use File::Spec;
use lib File::Spec->rel2abs('lib');
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