CONFIG_MACH_G4EVM is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

G4EVM board

modulename: board-g4evm.ko

configname: CONFIG_MACH_G4EVM

Linux Kernel Configuration
└─>G4EVM board
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
source code:
arch/arm/mach-shmobile/board-g4evm.c