Can't find a copy of ieee80211_external.h file for compling hostapd
I'm trying to set up a ubuntu linux wireless access point at my house. I can get hostapd to serve up a "g" mode connection, but I cant get the access point to go into "n" mode. When I run hostapd tells me unknown hw_mode" 'n'. My hardware is using the ath9k driver. I've tried recompiling hostapd, however I can only successfully compile for the generic nl80211 drivers. I would like to try compiling for atheros or madwifi, however the complie fails because I don't have ieee80211_external.h installed on my system which both drivers require. I have searched the internet and can not find a source for the file. My experience with linux is limited. Should it be obvious where to find this header?