The use statement searches a module in @INC. The lib pragma adds directories to @INC. So you will likely want to tell Perl (for this script) to also look elsewhere for your code: 

use lib '../foo';

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If you have a directory with modules that you always want to use, you can set $ENV{PERL5LIB} (or was it $ENV{PERL5INC} ?). If you only want to alter the module search path for one invocation of your program, you can invoke it as:

perl -I../foo my_script.pl

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In reply to Re: using a file in a different dir by Corion
in thread using a file in a different dir by Delusional

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