OK, in summary, here's what I've found:
I'm working with an FC6 box (a new DEll 2950) with two kernels installed, 2.6.18-1.2798.fc6 and 2.6.20-1.2944.fc6. The 40002347_c.src.rpm builds and works fine with 2.6.18, but will not build with 2.6.20. The pre-release candidate dgap-1.3-11.src.rpm builds without errors on either kernel, but will not work with 2.6.20. It loads OK, but the console program conserver cannot connect to the console.
I started conserver in debug mode and it says that there is no /dev/ttya01 so it downs the console that I have configured for that tty (this is still not in production so I only have one host connected on this Xem). As near as I can tell, with 2.6.20 and the 1.3-11 module there are no /dev/ttya's created.
So unless there are any other suggestions I'll forward this info to Tech Support.
Thanks very much.