diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8f86cb4..b3ebf15 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -614,6 +614,7 @@ set(src_sys_dedicated	sys/linux/dedicated.cpp)
 
 if (APPLE)
 	set(src_sys_base
+		sys/threads.cpp
 		sys/sys_local.cpp
 		sys/posix/posix_net.cpp
 		sys/posix/posix_signal.cpp
@@ -635,6 +636,7 @@ if (APPLE)
 	)
 elseif (WIN32)
 	set(src_sys_base
+		sys/threads.cpp
 		sys/sys_local.cpp
 		sys/win32/win_cpu.cpp
 #		sys/win32/win_gamma.cpp
@@ -654,6 +656,7 @@ elseif (WIN32)
 	)
 else()
 	set(src_sys_base
+		sys/threads.cpp
 		sys/sys_local.cpp
 		sys/posix/posix_net.cpp
 		sys/posix/posix_signal.cpp
diff --git a/sys/sys_public.h b/sys/sys_public.h
index 6813bae..f583ca2 100644
--- a/sys/sys_public.h
+++ b/sys/sys_public.h
@@ -383,13 +383,17 @@ void				Sys_DestroyThread( xthreadInfo& info ); // sets threadHandle back to 0
 // if index != NULL, set the index in g_threads array (use -1 for "main" thread)
 const char *		Sys_GetThreadName( int *index = 0 );
 
-const int MAX_CRITICAL_SECTIONS		= 4;
+extern void Sys_InitThreads();
+extern void Sys_ShutdownThreads();
+
+const int MAX_CRITICAL_SECTIONS		= 5;
 
 enum {
 	CRITICAL_SECTION_ZERO = 0,
 	CRITICAL_SECTION_ONE,
 	CRITICAL_SECTION_TWO,
-	CRITICAL_SECTION_THREE
+	CRITICAL_SECTION_THREE,
+	CRITICAL_SECTION_SYS
 };
 
 void				Sys_EnterCriticalSection( int index = CRITICAL_SECTION_ZERO );