Sorry to chime in late ...

All comments already given so far are valid. (Shared) libraries and objects on HP-UX of different architecture do not mix. That is not only the case for 32bit vs 64bit, but also for PA-RISC on Itanium. IA64 has native support for PA-RISC objects, but they do not load in Itanium code.

Maybe you can skip the build phase and fetch my prebuilt binary depots that include both a 32bit (/opt/perl) and a 64bit perl (/opt/perl64) build.