Just for giggles, are you using the base perl in a FreeBSD ~4.6 server?

I had the same/similiar problem with p5-SpamAssassin and p5-File-Spec. Current p5-File-Spec was installed via ports, but it still wasn't seen.

The problem turned out to ge that the base perl's @INC was compiled so it would check the base patchs first, then the site_perl paths next. I other works, base perl modules were found first. site_perl modules were never found it they also existed in the base paths.

Shortly thereof, perl was patched and a recompile fixed the @IN path order.

http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/43557
http://www.freebsd.org/cgi/query-pr.cgi?pr=ports/39337