I've seen this sort of thing happen before with ppm builds of PAR. ActiveState build their 5.8.x binaries using perl-5.8.0, and I think that's how the 5.8.0 dependency creeps in. The various 5.8.x dll's don't all export the same set of functions (for differing values of "x"), and
is apparently a case in point. (Looks like the 5.8.0 dll does export it, but not the 5.8.8 dll.)
It has been quite a while since I've seen this issue crop up - so I'm hazy on the details.