I am still stuck, anyone got any ideas ? Hi, Having no digium hardware in my box and two cpus and a ohci usb bus im forced to use zaprtc. I have recompiled the kernel and removed enhanced rtc support. When I attempt to compile zaprtc I get the following error. zaprtc.c:1077: warning: implicit declaration of function `barrier' zaprtc.c:1078: warning: implicit declaration of function `cpu_relax' zaprtc.c: At top level: zaprtc.c:109: storage size of `rtc_irq_timer' isn't known zaprtc.c:719: storage size of `rtc_fops' isn't known zaprtc.c:107: warning: `DECLARE_WAIT_QUEUE_HEAD' declared `static' but never defined make: *** [zaprtc.o] Error 1 Can anyone offer advice on where to start . Thanks David Counting the days to astricon.