If you want to use the memberof attribute, you need to install the overlay:
ldapadd -Y EXTERNAL -H ldapi:/// -f overlay.ldif
ldapadd -Y EXTERNAL -H ldapi:/// -f refint.ldif
Installing the marathon schema is required if you want to store permissions in openldap.
ldapadd -Y EXTERNAL -H ldapi:/// -f marathon.ldif