CONFIG_PPC_C2K is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

SBS/GEFanuc C2K board

modulename: c2k.ko

configname: CONFIG_PPC_C2K

Linux Kernel Configuration
└─>SBS/GEFanuc C2K board
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
This option enables support for the GE Fanuc C2K board (formerly
an SBS board).

source code: