This may be intentional, I would not know, anyway I thought you guys may be interested in knowing that the aforementioned kernel sources for PPC64 (which is to say that the relevant directory in the kernel source is include/asm-ppc64) lack agp.h and rtc.h. This causes the kernel build to fail whenever CONFIG_AGP and CONFIG_RTC (or CONFIG_GEN_RTC) are set, respectively.
there isn't an AGP implementation in the ppc64 kernel as of yet. talked to benh about it today. likewise CONFIG_RTC isn't valid. (ppc is the same wrt the rtc)
closing