Starting autovacuum in postgresql-8.1.9

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I am running Red Hat Enterprise Linux 5 and postgresql-8.1.9-1.el5 (&c.).

It seems autovacuum would be a good idea, but I cannot see how to start it,
mainly because I cannot find it. There are autovacuum settings in
postgresql.conf, but they are all commented out.

Does it suffice to turn them on and restart the postmaster? Or are they off
because autovacuum is not supported? I have looked around in the PostgreSQL
book by Douglas & Douglas and they say it is in a contrib directory, but the
one that makes sense does not seem to contain it. Is it built into the
server now, or is it to be found somewhere else? In particular, pgavd does
not exist anywhere on my system.

- --
.~. Jean-David Beyer Registered Linux User 85642.
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