hostapd is missing 802.11ac mode support

When I try to create an AP using 802.11ac hostapd complains about unknown configuration items.

I have a Compex acWave WLE900VX mini-pcie card that's fully supported by the ath10k_pci module.

I took the example hostapd.conf settings from kernel.org ath10k page:
http://wireless.kernel.org/en/users/Drivers/ath10k/configuration

-- start hostapd.conf ---
interface=wlan0
driver=nl80211
ssid=ath10k-test
hw_mode=a
channel=36
ht_capab=[HT40+]
ieee80211n=1
ieee80211ac=1
vht_oper_chwidth=1
vht_oper_centr_freq_seg0_idx=42
--- end hostapd.conf ---

sudo hostapd -dd hostapd.conf
random: Trying to read entropy from /dev/random
Configuration file: hostapd.conf
Line 10: unknown configuration item 'ieee80211ac'
Line 11: unknown configuration item 'vht_oper_chwidth'
Line 12: unknown configuration item 'vht_oper_centr_freq_seg0_idx'
3 errors found in configuration file 'hostapd.conf'

The solution is to add the following to the ./configure file at compile time:

"CONFIG_IEEE80211AC=y"

As 802.11ac picks up in popularity everyone is going to want this support.

Thank you!