https://bugs.openldap.org/show_bug.cgi?id=9846
--- Comment #2 from David Coutadeur david.coutadeur@gmail.com --- Note that the new 2.2 release is also compatible with OpenLDAP 2.5 without any modification.
A new variable "SLAPD_VERSION" is available to choose the appropriate version at compilation. (2.6 being the default)