[syslog-ng] Syslog-ng uninstallation issue

Hi, I am using syslog-ng open source (3.0.3-1 rhel5 amd64). Syslog-ng install files in /opt/syslog-ng directory but in the uninstalling syslog-ng rpm does not remove this directory. Let me know how to solve this problem? Is there any release with this fix? I don't want to remove /opt/syslog-ng directory manually. Please help! Regards, Vaibhav