Hi! lukem imported openldap into NetBSD in 2008 and had big plans for working on it, but they didn't materialize; and as I understood him last weekend, he doesn't have these plans any longer. (Correct me if I'm wrong, Luke.)
I think there is no particular need to have openldap in the base system; I don't see any particular integration, and it puts more burden of maintenance on us. I think that installing openldap from pkgsrc should be good enough. So I suggest removing it from the base system. Comments welcome! Thomas