Can't compile with kernel 2.6.7

Hello,

I got the at76c503a driver sources from cvs as described in 
http://at76c503a.berlios.de/cvs.html, but I can't compile it. I get 
loads of error messages, most of the type

include/linux/skbuff.h:571: error: dereferencing pointer to incomplete type

or

include/linux/uio.h:46: Warnung: return type defaults to `int'

These are only examples, I would guess there are several hundred errors.

My setup:
Debian Sarge, kernel-image 2.6.7-1-k7
kernel-source 2.6.7 installed, no patches
/lib/modules/2.6.7-1-k7/build points to /usr/src/kernel-source-2.6.7

What am I doing wrong?

Thank you,

Johannes