Could not execute auto check for display colors using command /usr/bin/xdpyinfo

When try to install oracle database 11gR2 on RedHat Linux 5.2 (running on Oracle VM) via running runInstaller.sh in ssh

I hit the below error:

Could not execute auto check for display colors using command /usr/bin/xdpyinfo

This is the installation of Linux without installing x11 server.

1. So I run the below command to install x11 server

yum install xorg-x11-server-Xorg xorg-x11-server-common.

2. If you haven't configured yum before, please follow the below document to config yum
http://public-yum.oracle.com/

basiclly, you need to login as root, wget yum repository, enable repository update, then u can use yum install to update your linux env.

3. If it still doesn't work, double check if you use 'su - oracle' because Using 'su - oracle' will break X screen forwarding or proper display when using Oracle runInstaller.

So you need ssh the host with user oracle.