Upgrading SAPI from 4.2.2 to 4.3.6 on RH9 with Apache 2

Hi. I'm trying to upgrade a server (up2date RedHat9) - which is running Apache 2 (default!) and PHP 4.2.2 - to PHP 4.3.6. It is the SAPI version (running as an Apache module). I have downloaded the tar.gz, exploded that and run ./configure --disable-cgi --with-apxs2=/var/share/Apache/apxs.pl However it errors with apxs:Error: /home/httpd-win32-msi/apache-1.3.20/httpd not found or not executable So it seems I have completely the wrong version! I don't seem to be able to find apxs.pl for Apache 2 on linux (RH9). Could anyone point me in the right direction and possibly warn of me of the upcoming problems I am bound to face? :) Thanks. Tom