I'm following -stable until I read some more, and I'm unclear on some
aspects of syncing source.

What's a patch?
---------------

There was an earlier post about why there are no security patches for
4.3 listed at:

http://www.openbsd.org/pkg-stable.html

Is that different from:

http://www.openbsd.org/errata43.html

which lists some patches?

Since running -stable, there were changes to userland in /usr/src which
I built. Was that not considered a patch?

Building only changes?
----------------------

The FAQ describes building userland in which you first delete /usr/obj.
Do I need to do that, or can I just run make obj and maybe have it only
build what has changed? (There were no changes to try this with
recently)

Kendall