I suggest you try the LDAP Tool Box: https://ltb-project.org/
It creates a full OpenLDAP in /usr/local. This is done because of the dependency problems. If you try to build or install just the openldpa-server it might make the current OpenLDAP clients fail and there are dependencies on them for the authentication used by PAM, SSSD, etc.
There is also Symas OpenLDAP, but I can't find a reference right now.
The OpenLDAP code is being phased out of RedHat and derivatives. They intend to replace it with 389 Directory Server (aka Fedora DS, aka RedHat DS). 389 has some features that OpenLDAP does not, but OpenLDAP has features that 389 does not (proxy, etc). It would be best if RH decided to make the server choice independent of the client choice. Then EPEL could distribute both.
I'm here because I need to Proxy.
Gary