[linux-dvb] How could I compile dvb-usb-cxusb module out of the kernel source.

[lwtbenben]

 I want to compile the dvb-usb-cxusb module outside the kernel tree, my makefile is like this,
 
 ifneq ($(KERNELRELEASE), )
 obj-m := dvb-usb-cxusb.ko
 dvb-usb-cxusb-y := .o cxusb.o
 else
 KERNELDIR := /lib/modules/2.6.20-16-generic/build
 all::
       $(MAKE) -C $(KERNELDIR) M='pwd' $@
 endif
 
 clean:
       rm -f *.o
       rm -f *.ko

   But there are many faults. How should I write my Makefile???
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