Newbie problem building mod_dav_svn

Help!

I'm trying to get Apache2 running with mod_dav_svn. I am stuck because
I simply can't seem to get mod_dav_svn.so built. Everything seems to
work correctly, so there's no error to report. Ideally, I'd prefer to
use the apache2 that is pre-installed, but any solution would be
appreciated.

First attempt:
port install subversion
...generates what seems to be a working version of svn with no errors,
but no Apache module either.

Second attempt:
port install subversion +mac-os-x-server-mod_dav_svn
...generates with no errors, but doesn't seem any different. The
output version is listed as @1.3.1_0+mod_dav_svn (active)

When I looked at the above variant, it seems to be looking for
/opt/apache2, which is not where the default (Apple) install of apache
is installed. It looks like there's a reference to
/opt/apache2/bin/apxs that doesn't work. A symlink to /usr/sbin/apxs
doesn't do the trick either.

Third attempt, trying to use the open darwin port of Apache2:
port install apache2
port install subversion+mod_dav_svn

again, no errors. Just no mod_dav_svn.so, anywhere.

At this point, I'm completely baffled. How does one generate the Apache module?

MacOS 10.4.7
Mac Mini Intel (duo)

Many, many thanks.
-- Brian Hanafee