samples/usb/webusb/src/Makefile - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 ccflags-y += -I${ZEPHYR_BASE}/include/usb/ -I${ZEPHYR_BASE}/subsys/usb/class

 obj-y += webusb_serial.o main.o
	ccflags-y += -I${ZEPHYR_BASE}/include/usb/ -I${ZEPHYR_BASE}/subsys/usb/class

	obj-y += webusb_serial.o main.o