From 53f66b23f4ed491baa3cfe2379063fd43e5b82c0 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <tridge@samba.org>
Date: Sun, 29 Sep 2013 14:24:55 +1000
Subject: [PATCH] AP_HAL_Linux: fixed APM2 build

---
 libraries/AP_HAL_Linux/Semaphores.cpp | 5 +++++
 libraries/AP_HAL_Linux/Semaphores.h   | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/libraries/AP_HAL_Linux/Semaphores.cpp b/libraries/AP_HAL_Linux/Semaphores.cpp
index e4edcc7a85..b9b816814d 100644
--- a/libraries/AP_HAL_Linux/Semaphores.cpp
+++ b/libraries/AP_HAL_Linux/Semaphores.cpp
@@ -1,3 +1,6 @@
+#include <AP_HAL.h>
+
+#if CONFIG_HAL_BOARD == HAL_BOARD_LINUX
 
 #include "Semaphores.h"
 
@@ -26,3 +29,5 @@ bool LinuxSemaphore::take_nonblocking()
 {
     return pthread_mutex_trylock(&_lock) == 0;
 }
+
+#endif // CONFIG_HAL_BOARD
diff --git a/libraries/AP_HAL_Linux/Semaphores.h b/libraries/AP_HAL_Linux/Semaphores.h
index 2a650df4c5..7828cbf0e1 100644
--- a/libraries/AP_HAL_Linux/Semaphores.h
+++ b/libraries/AP_HAL_Linux/Semaphores.h
@@ -2,6 +2,9 @@
 #ifndef __AP_HAL_LINUX_SEMAPHORE_H__
 #define __AP_HAL_LINUX_SEMAPHORE_H__
 
+#include <AP_HAL_Boards.h>
+
+#if CONFIG_HAL_BOARD == HAL_BOARD_LINUX
 #include <AP_HAL_Linux.h>
 #include <pthread.h>
 
@@ -16,5 +19,6 @@ public:
 private:
     pthread_mutex_t _lock;
 };
+#endif // CONFIG_HAL_BOARD
 
 #endif // __AP_HAL_LINUX_SEMAPHORE_H__