/bin/sh: line 0: cd: /lib/modules/2.6.11-auditor-10/build: No such file or directory
Makefile.inc:66: *** /lib/modules/2.6.11-auditor-10/build is missing, please set KERNELPATH. Stop.

I am trying to compile a driver and seem to be missing a build file(installing madwifi for artheros card)
it appears to be locked or missing
Could some one please help me out with some ideas on what I should do?
I am not that good at linux sorry
thanks for the help in advance