Ensure X forwarding is enabled, and log in as oracle:
xhost + su oracle
Start the oracle installer:
cd /tmp/Disk1 ./runInstaller
If everything is working you should see everything pass, and a window will pop up. If not, go back and make sure you didn't miss anything.
ignore two rpm errors (in console)
ignore two compile errors (gui - click continue)
edit root.sh before running it. change all rc.d/rc#.d to rc#.d