buildroot/boot/grub2/Config.in

config BR2_TARGET_GRUB2
	bool "grub2"
	# Only supports PC, Mac (Power, x86 and x86-64), Pegasos
	depends on BR2_i386 || BR2_powerpc
	# Build process is broken (./configure doesn't work, Ruby
	# required, etc.)
	depends on BROKEN
	help
	  The GRand Unified Bootloader for x86 systems, take #2.