subsys/usb/class/Makefile - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 ccflags-y += -I${srctree}/include/drivers/usb -I${srctree}/include/usb/ -I${srctree}/usb/include/

 obj-$(CONFIG_USB_CDC_ACM) += cdc_acm.o
 obj-$(CONFIG_USB_MASS_STORAGE) += mass_storage.o
 obj-y += netusb/
	ccflags-y += -I${srctree}/include/drivers/usb -I${srctree}/include/usb/ -I${srctree}/usb/include/

	obj-$(CONFIG_USB_CDC_ACM) += cdc_acm.o
	obj-$(CONFIG_USB_MASS_STORAGE) += mass_storage.o
	obj-y += netusb/