The contrib section does not have usable makefiles (nor the system to create them).

Putting this overlay in contrib, where it would be unmaintained and practically broken right away from the start (due to missing build integration) doesn't make any sense.

People interested in the overlay are able to download it from the maintained location at:

http://techpubs.spinlocksolutions.com/openldap/

Davor Ocelic Spinlock Solutions http://www.spinlocksolutions.com/