syslog-ng doesnt have different versions for relaying, serving, or clienting, its all the same just a different config. You can view the documentation available at http://www.balabit.com/support/documentation and configure it to do whatever you want.
The only thing that is pre-determined on compile-time is features like sql logging. You can view what features were enabled on compile by doing `syslog-ng -V`

-Patrick

Sent: Wed Jan 19 2011 10:29:09 GMT-0700 (Mountain Standard Time)
From: julian <bentayeb1@llnl.gov>
To: syslog-ng@lists.balabit.hu
Subject: [syslog-ng] Open source version: syslog-ng-3.1.3-1.rhel5.i386.rpm

what install options are assumed for syslog-ng-3.1.3-1.rhel5.i386.rpm: server,
relay, client? It is acting as relay.

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