Build script (at least 'fedoraproject.org' one) do use a local copy of 'httpd.conf' file to launch a test instance.

Under Fedora 18, with modules changes on Apache httpd 2.4 (see http://httpd.apache.org/docs/2.4/upgrading.html), that config file is no longer usable; and new one could not be used with httpd 2.2.

A solution could be to use system side apache configuration (/etc/httpd/conf/httpd.conf), if default config is OK.
Another option would be to include another httpd.conf file for apache 2.4 and the make directive (or argument) to use 2.4 instead of 2.2.