PHP with MySQL support should have been installed by the Red Hat installer when I installed the OS, at least I selected those packages, but PHP pages are not being processed.

I checked the FAQ and it said to make sure all the PHP add and load module directives were there and uncommented. Well, they are, but they're all within <IfDefine HAVE_PHP> sections, and the modules they point to (i.e. mod_php.so, mod_php.c) are not in /etc/httpd/modules nor any place else on my system. That must be the source of the problem, but why wouldn't those modules have been copied to the system?

So, I've tried building from the source per the INSTALL document, but after I try to ./configure I get...

checking lex output file root... ./configure: lex: command not found
configure: error: cannot find output from lex; giving up

What's lex? What's going on? Thanks.