compiling module nvidia

[mondrillo <mondrillo@terra.es>]

Hello amd64's list

I'm a newbie to the amd64 plataform, and I'm triying to compile a
nVidia [GeForce FX 5200].

I have trying the method  related
in /usr/share/doc/nvidia-kernel-source/README.Debian

I've the 2.6.8-11-amd64-k8 kernel and kernel-headers-2.6.8-11-amd64-k8 
I installed the nvidia-kernel-source.tar.gz
When I execute the command : 
 debian/rules binary_modules
...
IGNORE_CC_MISMATCH=1 CC="gcc-3.4"  /usr/bin/make
-C /usr/src/modules/nvidia-kernel/nv -f Makefile SYSSRC=/usr/s
rc/kernel-headers-2.6.8-11-amd64-k8
KBUILD_PARAMS="-C /usr/src/kernel-headers-2.6.8-11-amd64-k8
SUBDIRS=/usr/ src/modules/nvidia-kernel/nv" module;
make[1]: Entering directory `/usr/src/modules/nvidia-kernel/nv'
failed to determine PATCHLEVEL!
make[1]: *** [module] Error 1
make[1]: Leaving directory `/usr/src/modules/nvidia-kernel/nv'
make: *** [build-stamp] Error 2
...

what's PATCHLEVEL? why break if the packages are same version
2.6.8-11-amd64-k8

I have see that PACHLEVEL==6 and it's spects PACHLEVEL=4.

If anybody can helpme thank's you

Regard's