Index: boost/config/compiler/clang.hpp
===================================================================
--- boost/config/compiler/clang.hpp	(revision 77253)
+++ boost/config/compiler/clang.hpp	(working copy)
@@ -44,7 +44,9 @@
 #  define BOOST_NO_DECLTYPE
 #endif
 
-#define BOOST_NO_DECLTYPE_N3276
+#if !__has_feature(__cxx_decltype__)
+#  define BOOST_NO_DECLTYPE_N3276
+#endif
 
 #if !__has_feature(cxx_defaulted_functions)
 #  define BOOST_NO_DEFAULTED_FUNCTIONS