Ok next problem that I bumped into today while trying to install PHP5 on Apache2. In the php instructions it tells you to use the --with-apxs2 and point that to the apxs file. Now the standard install of Fedora 3 doesnt install this file for you, so you need to install the httpd-devel package. This can be done easily using up2date with this command.
up2date httpd-devel
and this will install the apxs file which for should now sit in /usr/sbin
then to configure the php5 issue the command
./configure --with-apxs2=/usr/sbin/apxs --with-mysql
hope that helps