yes it should be. If Apache was installed from packages, you may need to ensure that the apache development package got installed (I know it's seperate under rpms, I'm betting it is under pkg as well, but who knows.)
What you need is a file called apxs that is a perl script that apache uses to configure external shared objects.
If you find it on your hard drive somewhere, then you use the --with-apxs switch like so
./configure --with-apxs=/www/bin/apxs
where /www/bin/apxs is the path my machine to the apxs file. your mileage may vary.
