Yep - then it looks to me that all you have to do is use a Language-Prolog-Yaswi-0.08 that has been built using a version of perl between 5.8.0 and 5.8.6 (inclusive) .... or update to perl 5.8.7 (in which case Randy's ppm should work fine).
As regards the first of those 2 options, my offer still stands.