Question about 4.0.6-7 Mysql 4.0.1 and Redhat 7.2

I know, the base install installs 4.0.6-7. but my problem comes when i try upgrading to mysql 4.0.1. When I try installing 4.0.1 of mysql it has to uninstall the 3.23.41-1 version and then install 4.0.1 I get a conflict that says that libmysqlclient.so.10 is needed by php.mysql and a few other things. Well, the problem is, is that I cannot get any of the built-in mysql functions (mysql_fetch_ro(), mysql_connect(), ... ) to work at all. Throught the browser it returns the error, "Fatal error: Call to undefined function: mysql_fetch_row() in /var/www/html/index.php on line 2" any help would be great. Jim Lucas