Make missing seperator

hi do any one have the solution to this prob

i m just into the kernel module prog so i make the hello program and make its make file as simple as
makefile


KERNELDIR = /usr/src/linux-2.4.20-6/include/

CFLAGS = -D__KERNEL__ -I$(KERNELDIR) -O -Wall

all: hello.o

clean:
rm -r hello.o

it is giving error

makefile:15: *** missing separator. Stop.

line 15th is last line
rm -r hello.o

i check all options what is this error for??
:?

You probably forgot to indent with a tab

I am a newbie too...
I am not really known your problem, but i tried to compile a helloworld successfully with an simplier makefile.
Makefile is like the following,

obj-m += modulename.o



and I use the following command to compile the module in the same directory the Makefile is,

make -C /lib/modules/`uname -r`/build SUBDIRS=$PWD modules

hope this can help you...