ifneq ($(KERNELRELEASE),)
	obj-m := usb_wwan.o
else
	PWD=$(shell pwd)
	KDIR := /usr/src/linux-headers-$(shell uname -r)

all:
	make -C $(KDIR) M=$(PWD) modules
clean:
	rm -rf *.ko *.o *.mod.o *.mod.c *.symvers  modul* .*.ko.cmd .*.o.cmd .tmp_versions
endif