11GR2 Grid Install fail with NTP error

Error:

INFO: NTP daemon slewing option check failed on some nodes
INFO: Check failed on nodes:
INFO: racpre2,racpre1
INFO: PRVF-5436 : The NTP daemon running on one or more nodes lacks the slewing option "-x"
INFO: Clock synchronization check using Network Time Protocol(NTP) failed
INFO: PRVF-9652 : Cluster Time Synchronization Services check failed


Solution:

vi /etc/sysconfig/ntpd

OPTIONS="-x -u ntp:ntp -p /var/run/ntpd.pid"