--- src/fcatomic.h.orig	2015-05-27 17:13:38.834400000 -0400
+++ src/fcatomic.h	2015-05-27 17:14:27.338800000 -0400
@@ -46,6 +46,7 @@
 
 #elif !defined(FC_NO_MT) && defined(_MSC_VER) || defined(__MINGW32__)
 
+#include "emmintrin.h"
 #include "fcwindows.h"
 
 /* mingw32 does not have MemoryBarrier.