src/ec/google/chromeec/Makefile.inc - chromiumos/third_party/coreboot - Git at Google

 driver-y += ec.c
 smm-y += ec.c
 romstage-y += ec.c

 CFLAGS += -I $(call strip_quotes,$(CONFIG_EC_GOOGLE_API_ROOT))
	driver-y += ec.c
	smm-y += ec.c
	romstage-y += ec.c

	CFLAGS += -I $(call strip_quotes,$(CONFIG_EC_GOOGLE_API_ROOT))