Don't require your users to set PERL5LIB themselves in order to run your scripts.  Set it yourself (locally for the process), in a wrapper script, or some such.  If they then still insist on pointing their PERL5LIB to your private libs in their day-to-day environment, it's their problem...

You could also write the wrapper such that it copies the contents of some other env variable (e.g. XX_ROOT) into PERL5LIB.  This way, they could make their choice by setting XX_ROOT without affecting anthing else, while you can still take advantage of PERL5LIB, to avoid littering use lib all over the place.

#!/bin/sh
export PERL5LIB=$XX_ROOT
exec ...
[download]

P.S.: Perl's -I command line option could be used similarly:

#!/bin/sh
exec perl -I$XX_ROOT ...
[download]

(you can only specify one directory per -I option, though)

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