really sorry for the lack of details because I'm really outside my field.
I was just observing in openldap-2.5.4 the pbkdf2 module tries to install to /usr/local/libexec/openldap despite the
--prefix=/opt/openldap
in the configure on the src root.
I am pretty sure it worked fine on openldap-2.4.* (at the beginning it didn't but then it was fixed).
It's not a big deal, thank you for your great work,
franz