syslog-ng 2.0 seems te be near to a final release. I have been playing around with it for a bit, and with some minor changes the 1.6.11 ebuild works fine. Attached to this bug you will shortly find an ebuild diff.
Created attachment 98236 [details, diff] syslog-ng-1.6.11-2.0_rc3.ebuild.diff
*** This bug has been marked as a duplicate of 79116 ***