ifeq ($(KERNELRELEASE),)  
KERNELDIR ?= /lib/modules/$(shell uname -r)/build 
PWD := $(shell pwd)  
.PHONY: build clean  
build:
		$(MAKE) -C $(KERNELDIR) M=$(PWD) modules  
clean:
		rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c 
else  
$(info Building with KERNELRELEASE = ${KERNELRELEASE}) 
obj-m := pcnet.o  
endif