After installation of
RedHatEL30 let's install Oracle Client for a 8.1.7.4 database...
Pre-requisite :
InstallJava
http://didier.deleglise.free.fr/orak_et_linux/install_oracle_php.htm [fr] 3 tier installation of Apache / PHP + Oracle
http://www.tldp.org/HOWTO/Oracle-8-HOWTO-2.html