+// C++0x features in GCC 4.5.0 and later
+//
+#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 5) || !defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_NO_CXX11_NUMERIC_LIMITS
+# define BOOST_NO_CXX11_HDR_FUTURE
+# define BOOST_NO_CXX11_HDR_RANDOM
+#endif
+
+// C++0x features in GCC 4.6.0 and later
+//
+#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) || !defined(__GXX_EXPERIMENTAL_CXX0X__)
+# define BOOST_NO_CXX11_HDR_TYPEINDEX
+#endif
+
+// C++0x features in GCC 4.7.0 and later
+//
+#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7) || !defined(__GXX_EXPERIMENTAL_CXX0X__)
+// Note that although <chrono> existed prior to 4.7, "stead_clock" is spelled "monotonic_clock"
+// so 4.7.0 is the first truely conforming one.
+# define BOOST_NO_CXX11_HDR_CHRONO
+# define BOOST_NO_CXX11_ALLOCATOR
+#endif
+// C++0x headers not yet (fully!) implemented