Indeed. We disabled back-bdb in HEAD September 2008. commit 6dfa7b760e14a051ee15ea6fac5cc1784ef0883b Apparently that was not propagated to the RE24 configure.in.
Likely due to the fact that OpenLDAP 2.4 had been out nearly a year by then. ;)
--Quanah -- Quanah Gibson-Mount Architect - Server Zimbra, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration