ActivePerl is covered by a license agreement which states, in part,

You may make and give away verbatim copies of this Package for personal use, or for use within your organization, provided that you duplicate all of the original copyright notices and associated disclaimers. You may not distribute copies of this Package, or copies of packages derived from this Package, to others outside your organization without specific prior written permission from ActiveState (although you are encouraged to direct them to sources from which they may obtain it for themselves).

where

"Package" refers to those files, including, but not limited to, source code, binary executables, images, and scripts, which are distributed by the Copyright Holder.

So if your package requires ActivePerl specifically, it sounds simplest to provide a link to the ActivePerl distribution on ActiveState's site where users can obtain it.