Compilation problems for ATI linux driver package and Linux kernel 2.6.11.5

[Rainer Koschke <koschke at informatik dot uni-bremen dot de>]

I appreciate the help you provide for
ATI Linux driver packages for Debian.

Unfortunately, I am running into troubles in step 4 on page 
http://xoomer.virgilio.it/flavio.stanchina/debian/fglrx-installer.html

The compilation fails with 8.10.19-1 and Linux kernel sources
2.6.11.5.

/usr/src/modules/fglrx-kernel-src/firegl_public.c: In Function 
»__ke_agpgart_available«:
/usr/src/modules/fglrx-kernel-src/firegl_public.c:3018: error: 
`drm_agp_t' undeclared (first use in this function)
/usr/src/modules/fglrx-kernel-src/firegl_public.c:3018: error: (Each 
undeclared identifier is reported only once
/usr/src/modules/fglrx-kernel-src/firegl_public.c:3018: error: for each 
function it appears in.)
/usr/src/modules/fglrx-kernel-src/firegl_public.c:3018: error: parsing 
error before ')' token
/usr/src/modules/fglrx-kernel-src/firegl_public.c:3039: error: request 
for member `free_memory' in something not a structure or union
/usr/src/modules/fglrx-kernel-src/firegl_public.c:3041: error: request 
for member `free_memory' in something not a structure or union
/usr/src/modules/fglrx-kernel-src/firegl_public.c:3044: error: request 
for member `allocate_memory' in something not a structure or union
...

It seems as if the new kernel sources 2.6.11.5 have changed and some
data structure is no longer available. Or did I make a mistake?

What is wrong?

Cheers, Rainer