exim on an SGI

i'm about to install exim on an SGI running IRIX 6.4 (when the system
arrives in a couple of weeks).

in light of all the discussion about db code, what do people recommend
as the best approach on this platform? Berkely 1.86? something else?

i'm also going to be installing exim on a Linux PC in the near future,
and have the same question there...

thanks,
richard