Index: boost/thread/detail/config.hpp
===================================================================
--- boost/thread/detail/config.hpp	(revision 76283)
+++ boost/thread/detail/config.hpp	(working copy)
@@ -19,6 +19,29 @@
 #endif
 #endif
 
+#ifdef BOOST_NO_SCOPED_ENUMS
+#define BOOST_DECLARE_STRONG_ENUM_BEGIN(x) \
+  struct x { \
+    enum enum_type
+
+#define BOOST_DECLARE_STRONG_ENUM_END(x) \
+    enum_type v_; \
+    inline x()  {} \
+    inline x(enum_type v) : v_(v) {} \
+    inline operator int() const {return v_;} \
+    friend inline bool operator ==(x lhs, int rhs)  {return lhs.v_==rhs;} \
+    friend inline bool operator ==(int lhs, x rhs)  {return lhs==rhs.v_;} \
+    friend inline bool operator !=(x lhs, int rhs)  {return lhs.v_!=rhs;} \
+    friend inline bool operator !=(int lhs, x rhs)  {return lhs!=rhs.v_;} \
+  };
+
+#define BOOST_STRONG_ENUM_NATIVE(x) x::type
+#else  // BOOST_NO_SCOPED_ENUMS
+#define BOOST_DECLARE_STRONG_ENUM_BEGIN(x) enum class BOOST_SYMBOL_VISIBLE x
+#define BOOST_DECLARE_STRONG_ENUM_END(x)
+#define BOOST_STRONG_ENUM_NATIVE(x) x
+#endif  // BOOST_NO_SCOPED_ENUMS
+
 #if BOOST_WORKAROUND(__BORLANDC__, < 0x600)
 #  pragma warn -8008 // Condition always true/false
 #  pragma warn -8080 // Identifier declared but never used