Questions per installing on linux (Php 4)

Hello, and thanks for your time. First time... I saw a great resource on installing php on raq 3 (What I have, linux) http://marc.theaimsgroup.com/?l=php-general&m=98039640119670&q=raw but the thing is I have mysql installed when I do am done downloading, it says to use: ./configure --with-apxs=/usr/sbin/apxs --with-mysql=/usr/local/mysql --enable-track-vars --enable-trans-sid --enable-ftp Ok, but I have mysql. Should I remove the --with mysql ... and to have GD support, do I need a 'with gd ...' if so, what would that be? (I thought it was included) Or if I install postgres. Should I do that first? Do I need *Specific* syntax for postgres, such as --with-mysql=/usr/... ? To me, this is something I don't want to assume, I don't want to futz up anything. I figure this is the best place to ask for a no bs straight forward fact based answer thanks a ton, sorry for this being asked 100000th time by me, another newbie :) Joel