Are you sure that this 'use lib' pragma is what is causing your 500 error? You may want to examine the server's error logs for details about 500 Server Errors. You may also be interested in CGI::Carp, which will send your script's fatal errors to the browser instead of someplace like the server logs, which can be cumbersome for some ill-configured web installations: 
use CGI::Carp 'fatalsToBrowser';
...

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In reply to Re: Problem with use lib? by Fastolfe
in thread Problem with use lib? by Anonymous Monk

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