As I recall, there is already an ITS filed on this that has been fixed in
HEAD. At this point, I suggest testing against HEAD or RE_23 rather than
using 2.3.4, as many changes have happened since 2.3.4.
I also note that BDB 4.2.52+patches remains the preferred BDB version to
use with OpenLDAP. You play with 4.3.28 at your own risk (which may or may
not be slight).