Problems compiling kernel modules

[Lei Yang <leiyang@nec-labs.com>]

Hi all,

I was trying to compile a kernel module with kbuild. The module 'test.c' 
include a header file 'fred.h' and there is a "#include <stdio.h>" in 
'fred.h'.

Makefile looks like:

------------------------------------------------------------------------
ifneq ($(KERNELRELEASE),)
obj-m       := test.o

else
KDIR        := /usr/src/linux
PWD         := $(shell pwd)

default:
	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules
	

clean:
	rm -f *.o *.ko *.mod.c *.mod.o \
	.test.o.cmd .test.ko.cmd .test.mod.o.cmd
	rm -rf .tmp_versions
endif

-------------------------------------------------------------------------
But upon compiling, there would be errors like this:
In file included from /home/lei/test.c:49:
/home/lei/fred.h:4:19: stdio.h: No such file or directory

and a lot of undeclared names follow which I assume is from stdio.h.

Could anyone point out what's wrong here?

TIA!

Lei