There are no build error, but at runtime, OpenLDAP cannot load its modules.
Looking at the files, only some are installed on the target (file matching this regexp: back_([a-z]*)\-.*\.so\..*$)

Also libraries consistently (compilation, package, install) go to /usr/lib/openldap/openldap/ (twice "openldap"). Note that the files are build, but not installed.

I am using Jethro branch.

https://github.com/openembedded/meta-openembedded/blob/jethro/meta-oe/recipes-support/openldap/openldap_2.4.42.bb