@@ -, +, @@ 
 Source/ZenLib/Thread.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
--- a/Source/ZenLib/Thread.h	
+++ a/Source/ZenLib/Thread.h	
@@ -28,6 +28,7 @@ 
 #ifndef ZenLib_ThreadH
 #define ZenLib_ThreadH
 //---------------------------------------------------------------------------
+#include <cstddef>
 #include "ZenLib/Conf.h"
 #include "ZenLib/CriticalSection.h"
 #ifdef _WINDOWS