--- old/src/os/bsd/vm/semaphore_bsd.hpp	2015-06-25 18:20:28.857443857 +0200
+++ new/src/os/bsd/vm/semaphore_bsd.hpp	2015-06-25 18:20:28.705438681 +0200
@@ -25,14 +25,14 @@
 #ifndef OS_BSD_VM_SEMAPHORE_BSD_HPP
 #define OS_BSD_VM_SEMAPHORE_BSD_HPP
 
-#include "memory/allocation.hpp"
-
-#include <semaphore.h>
-
 #ifndef __APPLE__
+// Use POSIX semaphores.
 # include "semaphore_posix.hpp"
+
 #else
 // OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used.
+# include "memory/allocation.hpp"
+# include <mach/semaphore.h>
 
 class OSXSemaphore : public CHeapObj<mtInternal>{
   semaphore_t _semaphore;