[syslog-ng] syslog-ng 3.2.4 : How to handle syslogs with multiple lines

Hello   I am using syslog-ng on RHEL 5   Some syslogs from devices are wrapped. i.e. some syslogs contain multiple lines.   In such cases, syslog-ng is treating each line as a separate syslog. I need all lines beloging to that syslog to be considered as single line. The \n\r (s) should be ignored.   Adding flags (no-multi-line) option didn't help.   Could someone help to address this issue, please ?   Thanks