ati driver installer 8.40.4

ATI module generator V 2.0
==========================
initializing...
Error:
kernel includes at /lib/modules/2.6.21.5/build/include do not match current kernel.
they are versioned as ""
instead of "2.6.21.5".
you might need to adjust your symlinks:
- /usr/include
- /usr/src/linux
[Error] Kernel Module : Failed to compile kernel module - please consult readme.