From cb5552f0e3c0e98ed00d5149bb08df379b0ccda5 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Sun, 4 Jan 2015 12:29:22 +1100
Subject: [PATCH] Copter: fixed build with optflow disabled

---
 ArduCopter/system.pde | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ArduCopter/system.pde b/ArduCopter/system.pde
index dde3e35de2..46fe29c6a8 100644
--- a/ArduCopter/system.pde
+++ b/ArduCopter/system.pde
@@ -216,8 +216,10 @@ static void init_ardupilot()
     if(g.compass_enabled)
         init_compass();
 
+#if OPTFLOW == ENABLED
     // make optflow available to AHRS
     ahrs.set_optflow(&optflow);
+#endif
 
     // initialise attitude and position controllers
     attitude_control.set_dt(MAIN_LOOP_SECONDS);