Nope nope nope...

I just ran into that myself the other day. I had upgraded from 5.8.0 to 5.8.4 and installed in the same place. "which perl" didn't change.

The module in question had been installed under the 5.8.0 subdirectory, and I ended up manually nuking the files. Once I had done that, make install put the new version in the right place and didn't complain about the version of perl.

I had been getting exactly the same message (module version numbers) that the original poster had gotten.