Can't get PHP 4 module to load

Hello, I'm trying to get php 4 to work with MySQL and Apache. I can't seem to get the module to load in Apache. In the httpd.conf file the path was shown as lib/apache/libphp4.so. This directory didn't exist so I changed the path to modules/libphp4.so. When I try to restart the server I get the following error message: Cannot load /etc/httpd/modules/libphp4.so into server: libmysqlclient.so.10: Cannot open shared object file: no such file or directory. I created a link to libmysqlclient.so.10, but I get the same error message. I've been struggling with this problem for a couple of nights. Any help is appreciated. I'm running MySQL 3.23.40, PHP 4.0 and Apache 1.3.9 on RedHat 6.1. Thanks for your time, Mark