Index: ntoskrnl/include/internal/ex.h
===================================================================
--- ntoskrnl/include/internal/ex.h	(revision 37688)
+++ ntoskrnl/include/internal/ex.h	(working copy)
@@ -92,9 +92,9 @@
 #define MAX_HIGH_INDEX      (MID_LEVEL_ENTRIES * MID_LEVEL_ENTRIES * LOW_LEVEL_ENTRIES)
 
 //
-// Detect GCC
+// Detect old GCC
 //
-#ifdef __GNUC__
+#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ < 40300)
 
 #define DEFINE_WAIT_BLOCK(x)                                \
     struct _AlignHack                                       \