I ca't manage to compile fglrx module, as I get tons of errors. Any guess?

[Message] Kernel Module : Trying to install a precompiled kernel module.
[Message] Kernel Module : Precompiled kernel module version mismatched.
[Message] Kernel Module : Found kernel module build environment, generating
kernel module now.
ATI module generator V 2.0
==========================
initializing...
cleaning...
patching 'highmem.h'...
assuming new VMA API since we do have kernel 2.6.x...
doing Makefile based build for kernel 2.6.x and higher
make -C /lib/modules/2.6.16-flap/build
SUBDIRS=/lib/modules/fglrx/build_mod/2.6.x modules
make[1]: Entering directory `/usr/src/linux-2.6.16.14'
CC [M] /lib/modules/fglrx/build_mod/2.6.x/agp3.o
CC [M] /lib/modules/fglrx/build_mod/2.6.x/nvidia-agp.o
CC [M] /lib/modules/fglrx/build_mod/2.6.x/agpgart_be.o
/lib/modules/fglrx/build_mod/2.6.x/agpgart_be.c: In function '__fgl_agp_init':
/lib/modules/fglrx/build_mod/2.6.x/agpgart_be.c:8175: warning: 'pm_register'
is deprecated (declared at include/linux/pm_legacy.h:16)
/lib/modules/fglrx/build_mod/2.6.x/agpgart_be.c: In function
'__fgl_agp_cleanup':
/lib/modules/fglrx/build_mod/2.6.x/agpgart_be.c:8185: warning:
'pm_unregister_all' is deprecated (declared at include/linux/pm_legacy.h:26)
/lib/modules/fglrx/build_mod/2.6.x/agpgart_be.c: At top level:
/lib/modules/fglrx/build_mod/2.6.x/agpgart_be.c:6079: warning:
'ati_gart_base' defined but not used
CC [M] /lib/modules/fglrx/build_mod/2.6.x/i7505-agp.o
CC [M] /lib/modules/fglrx/build_mod/2.6.x/firegl_public.o
In file included from
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:162:
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.h:274:5: warning:
"FIREGL_VMA_INFO" is not defined
In file included from /lib/modules/fglrx/build_mod/2.6.x/drm_proc.h:41,
from
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:333:
/lib/modules/fglrx/build_mod/2.6.x/drmP.h:561:5: warning: "__HAVE_VBL_IRQ"
is not defined
/lib/modules/fglrx/build_mod/2.6.x/drmP.h:664:5: warning: "__HAVE_VBL_IRQ"
is not defined
/lib/modules/fglrx/build_mod/2.6.x/drmP.h:936:5: warning: "__HAVE_SG" is not
defined
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:407:5: warning:
"FIREGL_VMA_INFO" is not defined
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:426:5: warning:
"FIREGL_VMA_INFO" is not defined
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c: In function
'firegl_stub_putminor':
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:581: warning:
'inter_module_put' is deprecated (declared at include/linux/module.h:575)
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:583: warning:
'inter_module_unregister' is deprecated (declared at
include/linux/module.h:572)
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c: In function
'firegl_stub_register':
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:603: warning:
'inter_module_register' is deprecated (declared at
include/linux/module.h:571)
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:634: warning:
'inter_module_put' is deprecated (declared at include/linux/module.h:575)
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c: In function
'firegl_put_user_ptr':
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:1317: warning: cast from
pointer to integer of different size
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:1317: warning: cast from
pointer to integer of different size
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:1317: warning: cast from
pointer to integer of different size
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:1317: warning: cast from
pointer to integer of different size
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c: In function
'__ke_no_iommu':
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:2356: error: 'no_iommu'
undeclared (first use in this function)
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:2356: error: (Each
undeclared identifier is reported only once
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:2356: error: for each
function it appears in.)
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c: In function
'__ke_unregister_ioctl32_conversion':
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:2533: warning: 'return'
with a value, in function returning void
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c: At top level:
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3592: warning:
initialization from incompatible pointer type
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3593: warning:
initialization from incompatible pointer type
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3594: warning:
initialization from incompatible pointer type
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3595: warning:
initialization from incompatible pointer type
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3596: warning:
initialization from incompatible pointer type
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3597: warning:
initialization from incompatible pointer type
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3598: warning:
initialization from incompatible pointer type
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3599: warning:
initialization from incompatible pointer type
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3601: warning:
initialization from incompatible pointer type
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3611: warning: function
declaration isn't a prototype
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c: In function
'test_inter_module_interface':
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3677: warning:
'inter_module_put' is deprecated (declared at include/linux/module.h:575)
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3683: warning:
'inter_module_put' is deprecated (declared at include/linux/module.h:575)
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c: In function
'__ke_agp_allocate_memory_phys_list':
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3941: warning: passing
argument 3 of 'im_fglrx_agp_stub->allocate_memory_phys_list' makes integer
from pointer without a cast
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c: In function
'__ke_agp_bind_memory':
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3980: warning: passing
argument 1 of 'im_fglrx_agp_stub->bind_memory' from incompatible pointer
type
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c: In function
'__ke_agp_unbind_memory':
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:3993: warning: passing
argument 1 of 'im_fglrx_agp_stub->unbind_memory' from incompatible pointer
type
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c: In function
'__ke_smp_call_function':
/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:4222: warning: statement
with no effect
make[2]: *** [/lib/modules/fglrx/build_mod/2.6.x/firegl_public.o] Error 1
make[1]: *** [_module_/lib/modules/fglrx/build_mod/2.6.x] Error 2
make[1]: Leaving directory `/usr/src/linux-2.6.16.14'
make: *** [kmod_build] Error 2
build failed with return value 2
[Error] Kernel Module : Failed to compile kernel module - please consult
readme.

/lib/modules/fglrx/build_mod/2.6.x/firegl_public.c:2356: error: 'no_iommu'
undeclared (first use in this function)

This is your only error - sounds like you are missing a library.

You have a huge swag of warnings: these are usually the result of sloppy or apathetic coding (some just warn of depreciated stuff - showing that the code hasn't been updated to newer standards, but it's OK because there is a legacy header to deal with it. Later on this will be removed. Perhaps you should be compiling with an older version of gcc?)

Did you consult the "readme"?

Well, I used gcc4.0.3 and IOMMU is built into the kernel, and the readme can't say anything useful except (type chmod + ati....run, sh ./ati.....run etc etc)