Installing perl 5.6.1 on unstable

[Eric Smith <es@fruitcom.com>]

Hi

I am trying to run an accounting application XIWA which depends on perl 5.6.1.

Have maanged to install from a deb file the perl base and some modules but 
still getting symbol not found on some of the depent modules .so files.
I do not want to keep finding errors and then installing the 5.6.1 version
of each module.
How do I use the apt system to properly install all dependencies in ver. 5.6.1 on unstable
(parallel to my existing 5.8)?

thanks
-- 
Eric Smith