Checking kernel compatibility in:
	/usr/src/redhat/BUILD/kernel-2.6.21/linux-2.6.21.i686/

mac80211 headers not found in:

	/usr/src/redhat/BUILD/kernel-2.6.21/linux-2.6.21.i686/

Please install the mac80211 subsystem.

Terminating.
make: *** [compatible/kversion] Error 2