https://bugs.openldap.org/show_bug.cgi?id=9898
--- Comment #6 from michael.osipov@siemens.com --- (In reply to Howard Chu from comment #5)
You could just build gcc or clang for your HPUX systems instead.
Anyway, thanks for the reports, fixes will probably be merged soon.
Good joke. There is no GCC (died at 4.2.1) or LLVM (never ported) on HP-UX. Only the HP aC/aC++. So I have to use either this one or don't use any OSS.