Yes — in the sense that you won't get it to work with gcc without
an unreasonable amount of effort. However, that fact that you've got the
wrong one doesn't imply that there would also be another 'right' one to
download... It just doesn't seem to be available — at least I
couldn't find a 5.8.8/Solaris version built with gcc on
ActiveState.com's download page.
Anyhow, in case it's only that one module (Crypt::Blowfish) that
you're desperately in need of, I would offer to just build it for you
(and send you a tarball which you can unpack into your existing
ActivePerl installation). /msg me privately, if interested.