CONFIG_PPC_PMAC is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Apple PowerMac based machines

modulename: pmac_smp.ko

and/or

macio_asic.ko

and/or

pmac_pic.ko

and/or

open_pic.ko

configname: CONFIG_PPC_PMAC

Linux/PowerPC Kernel Configuration
└─>Platform support
└─> Apple PowerMac based machines
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
drivers/macintosh/