oracle runInstaller bash: xclock: command not found...

Error:
During installation of oracle getting below error on xclock or runInstaller

[oracle ~]$ xclock
bash: xclock: command not found...
Similar command is: 'clock'

Solution:
Look like rpm is missing or reinstall xorg-x11-apps

yum install xorg-x11-apps
yum reinstall xorg-x11-apps