--with-xml problems

I have installed php and apache and mysql on several systems using tutorials and the read me files several times. For some reason now, i am on day two of attempting to do so on a RH 6.2 system. Apache is up and running with php support, and MySQL is also running without anyproblems. The problem comes when trying to compile php 3.0.16 and install it. When I try to use the configuration line thats reccomended of "./configure --with-apxs --with-xml --with-mysql=/usr --with-imap" I get an error of "checking for XML support... ./configure: apxs: command not found configure: error: cannot find XML include files" now when I try again this time without the --with-xml option I get this error "WARNING: Your apxs script is most likely broken. Please go read http://www.php.net/FAQ.php3#4.11 and make the changes described there and try again." now having checked that reference which is actually #6.11 it tells me to check some lines of code in the apxs script, however i dont appear to have one, its not in the directories that the php faq references and when i do a "whereis" it doesnt show anywhere. I would love to use the mandrake distro i normally do, but in this case that isnt possible. Anyone have any ideas? thanks