No linux version yet. I don't think anyone downloaded it.
Just wait to 1.5 being released, and you'll have a couple downloads of the Linux version, guaranteed!
Seriously now, I think you're doing an excellent work, and I am really glad with your first PCL adventures. That's what PI is designed to be: a platform, not just an application!
When you feel this module is reasonably stable (which I think it is now) and feature-complete, we can talk about porting it to Mac OS X if you want. It would be very nice. And the Linux versions are important too, even if the (momentary) lack of downloads may seem discouraging (I could tell you something about discouraging attitudes toward one's software
).