Maybe you are trying to dynamically resolve the path to the lib.. like $ENV{HOME}/mystuff/lib, if you're running as apache, it won't work, HOME won't be set. But DOCUMENT_ROOT will be...

If you have stuff in /home/username/lib you could do..

#!/usr/bin/perl
use lib '../lib';
use HereThingOnly;
[download]

Which would work in /home/username/cgi-bin/* scripts
Then there would be a symlink at
/home/username/public_html/cgi-bin

Here's another possible solution.. BEGIN { $|=1; use CGI::Carp qw(fatalsToBrowser); eval qq|use lib "$ENV{DOCUMENT_ROOT}/../lib";|; }

Hope that helps.