I am installing Koha from source. Generic unix directions indicate the following step after sudo make install
sudo ln -s /etc/koha/koha-httpd.conf /etc/apache
Run apachectl -S which is shorthand for apachectl -t -D DUMP_VHOSTS
apachectl -S
apachectl -t -D DUMP_VHOSTS
According to the apachectl man file, this will show parsed settings (currently only vhost settings). Incidentally, it also checks your config file for errors.