I’ve had exactly the same problem. I’m not sure that my fix is optimal, but I was able to get the ztdummy driver to compile by going into ztdummy.c and commenting out the “#define USE_RTC” at line 49. This change basically forces the ztdummy driver to use different system calls to perform its functions than it would if RTC is available.
I’m not sure what implications this has for functioning of the ztdummy driver or what side effects it may have on operation of the MeetMe app.
There may be a better solution that allows use of the RTC functions under SuSE 10, but I’m new to asterisk and zaptel and haven’t found anyone else with a solution to this problem yet.