Hi

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Check against OpenLDAP 2.4.25.  I believe nearly all backends and overlays support slapd-config now.

I'm using 2.4.25, but short of trying every one of the official and
contrib overlays one by one, I don't know of any way to find out which
ones don't support slapd-config.  That's why I was asking: I was hoping
someone knew what the holdouts were, or knew where it was documented.

I think that here you can find your answer:
http://www.openldap.org/lists/openldap-devel/201102/msg00012.html

Regards
       Marco