in apache (both 1.3.9-8 and 1.3.9-4) in httpd.conf the line
is AFTER the apache module sections and in this case apache try to
find the modules in /usr/modules/ even if there is a link in
/etc/httpd/modules -> ../../usr/lib/apache/
I'm pretty sure you're looking at one of your old config files, and _not_ the
one that we currently ship with apache. As of at least 1.3.9-8, ServerRoot
directive is most definitely before the AddModule directives.