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in reply to How to add a file to @INC path in perl

Files aren't added to @INC, directories are. For example, if Porter.pm was located in /home/ikegami/perl5/lib, I could do 

use lib "/home/ikegami/perl5/lib";
use Porter;

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Keep in mind that if the package is My::Porter you, should place the file in /home/ikegami/perl5/lib/My and use 

use lib "/home/ikegami/perl5/lib";
use My::Porter;

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