PHP upgrade difficulties -- no apxs file

[George <george holylandtrust org>]

Howdy

  I'm trying to upgrade my RH 8 server from PHP 4.2.2 to 4.3.2

  To configure the PHP code, I need to send it through Apache's apxs
  perl code.  It is used to build shared Apache 2.0 modules.  It does
  not appear on my machine, though it appears that it was run during
  the previous PHP install. 

  How should I add it to my machine?
  mod_so.c is running in httpd.

  I still rate myself as a Newbie -- all of my understanding is from
  self-study.

Peace,
George