From ee37bc3d274854fd79dfa9c683c6ba6cbe64b848 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Sun, 16 Feb 2014 17:57:09 +1100
Subject: [PATCH] AP_AHRS: ensure we have HAL_CPU_CLASS available

---
 libraries/AP_AHRS/AP_AHRS_NavEKF.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libraries/AP_AHRS/AP_AHRS_NavEKF.h b/libraries/AP_AHRS/AP_AHRS_NavEKF.h
index 1bc1bf6a92..1956f484c9 100644
--- a/libraries/AP_AHRS/AP_AHRS_NavEKF.h
+++ b/libraries/AP_AHRS/AP_AHRS_NavEKF.h
@@ -21,6 +21,7 @@
  *
  */
 
+#include <AP_HAL.h>
 #include <AP_AHRS.h>
 
 #if HAL_CPU_CLASS >= HAL_CPU_CLASS_150