Installing php4.0.3 with PostgreSQL NOT MySQL (Almost a "newby" alert:-)

Hello, I'm upgrading from php3 (which worked fine thanks,) to php4. I use Postgresql (I come from a Mainframe background and I believe in transaction journaling data bases.) I'm hoping that the Quick Install (DSO) will work for me even though I'm not installing with MySQL. I figured out that I would have to replace the "--with-mysql" with "--with-pgsql=/usr/lib/pgsql" (That where teh PostgreSQL install put it). However I have no idea what to do with "--with-apxs" I'm watching the "make" messages scroll by and I'm wondering if I'm really screwing up... Though since I can run with php3 right now or maybe even both concurrently, its not desperately urgent. What the Heck is "--with-apxs"? -Charles-A.