In the Berkeley DB 3.1 release, the config argument to the DB_ENV->open() and DB_ENV->remove() methods has been removed, replaced by additional methods on the DB_ENV handle. If your application calls DB_ENV->open() or DB_ENV->remove() with a NULL config argument, find those functions and remove the config argument from the call. If your application has non-NULL config argument, the strings values in that argument are replaced with calls to DB_ENV methods as follows: