man page is wanked: db_open prototype doesn't match include file
The same was in the RH6.0 release, not fixed. I'd suggested to include original SleepyCat documentation, and ... ;-( Did you heard about the history of a shy man, that came to the physycian. - doctor, everyone is ignoring me, - next please !
the man page documents the interface for the version 1.85 of the DB. For more recent documentation, use the info pages.