I noticed on the Gizmo forums that they have a new Linux release (including a new one for the 770), 1.1.0.35, available for pre-release testing.

I installed it and it seems to work OK. Give it a beating and report any faults to the Gizmo forums.
The announcement post is here:
http://forum.gizmoproject.com/viewtopic.php?t=3408

If you don't know where the previews are found, go here:
http://download.gizmoproject.com/jasmine/

Also. don't bother with the building of Bonjour from source. It seems to work fine with howl and avahi and whatever is in the 770 providing zeroconf/DNS-SD.