apxs not found?

["Chip Burke" <cburke@xxxxxxxxxxxxxxxxxxx>]

I am trying to build PHP 5.2.5 on Fedora 8. The error I am getting is 

Sorry, I cannot run apxs.  Possible reasons follow:

1. Perl is not installed
2. apxs was not found. Try to pass the path using --with-apxs2=/path/to/apxs
3. Apache was not built using --enable-so (the apxs usage page is displayed)

The output of /usr/sbin/apxs follows:
cannot open /httpd/build/config_vars.mk: No such file or directory at
/usr/sbin/apxs line 201.
configure: error: Aborting

apxs is indeed installed at the location I specified in the configure
script. However, when I try to run apxs manually, I get that same error. 

cannot open /httpd/build/config_vars.mk: No such file or directory at
/usr/sbin/apxs line 201.

This is on Apache 2.2.8 and Perl 5.8.8.

Any ideas?