Can you help me about apache connect with php ?

Dear All, My System is Red Hat Linux 6.2... When I finished the installation ( Apache , MySQL , Php ) , then the Web Server ( Apache ) can't be good for working ( can't auto detect php format ) with php3 ( *.php3 ) and php4 ( *.php )... So, can you help me to solve the problem ? the installation packages : apache_1.3.20.tar.gz mysql-3.23.41.tar.gz php-4.0.6.tar.gz installation steps : Apache : ./configure --prefix=/usr/local/apache \ --enable-shared=max make make install /usr/local/apache/bin/apachectl start MySQL : groupadd mysql useradd -g mysql mysql ./configure --with-charset=big5 make make install scripts/mysql_install_db chown -R root /usr/local/share/mysql chown -R mysql /usr/local/var chgrp -R mysql /usr/local/share/mysql cp /usr/local/share/mysql/mysql.server /etc/rc.d/init.d/mysql /etc/rc.d/init.d/mysql start php ( php + apache ) : ./configure \ --with-mysql \ --with-apxs=/usr/local/apache/bin/apxs \ --with-imap \ --enable-versioning \ --enable-track-vars make make install cp php.ini-dist /usr/local/lib/php.ini Thank for your help ! Edward.