I have heard that this is some sort of RedHat bug?

Can anyone give me some more information on this one?

What is the safe fix here?

Thanks

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DB_File needs compatible versions of libdb & db.h
you have db.h version 3.1.14 and libdb version 3.1.17

The easiest solution is probably to install a new bdb, from http://www.sleepycat.com. Make sure that it's v 3.x, not 4.x as the latter has a new API and things will Postfix will break with it.