Apache 2 configuration is not found on debian (lenny, earlier versions
are most likely affected, too) systems since it is named apache2.conf
there.
A possible solution would be to do
apxs2 -q SBINDIR
apxs2 -q TARGET
to find the executable and then do
$EXECUTABLE -V | grep SERVER_CONFIG_FILE
to find the configuration.
Thanx,
Joachim