thor:~/aircrack-ng/madwifi-ng # make
Makefile.inc:91: *** KERNELCONF: /lib/modules/2.6.22.13-0.3-default/build/.config does not exist..  Stop.
thor:~/aircrack-ng/madwifi-ng # ls /lib/modules/
2.6.22.13-0.2-default  2.6.22.13-0.3-default  2.6.22.9-0.4-default
thor:~/aircrack-ng/madwifi-ng # ls /lib/modules/2.6.22.13-0.3-default/build
Module.symvers  makedumpfile.config
thor:~/aircrack-ng/madwifi-ng # cp /lib/modules/2.6.22.13-0.3-default/build/makedumpfile.config /lib/modules/2.6.22.13-0.3-default/build/.config
thor:~/aircrack-ng/madwifi-ng # make
ath_hal/ah_target.inc:5: *** ARCH must be defined.  Stop.
thor:~/aircrack-ng/madwifi-ng #