Something
public text v1 · immutableChecking 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