[grid@rhel65 grid]$ ./runInstaller
Starting Oracle Universal Installer...
Checking Temp space: must be greater than 120 MB. Actual 34027 MB Passed
Checking swap space: must be greater than 150 MB. Actual 3999 MB Passed
Checking monitor: must be configured to display at least 256 colors
>>> Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set. Failed <<<<
Some requirement checks failed. You must fulfill these requirements before
continuing with the installation,
Continue? (y/n) [n]
解决方法：
yum install -y xorg-x11-apps
yum -y install xorg-x11-utils
原文：http://blog.51cto.com/linux10000/2055609