diff --git INDEX:/boost/detail/container_fwd.hpp WORKDIR:/boost/detail/container_fwd.hpp
index 7211134..37080f5 100644
--- INDEX:/boost/detail/container_fwd.hpp
+++ WORKDIR:/boost/detail/container_fwd.hpp
@@ -117,7 +117,11 @@ namespace std
     template <class charT> struct char_traits;
 #endif
 
+#if defined(BOOST_CLANG)
+    template <class T> struct complex;
+#else
     template <class T> class complex;
+#endif
 
 #if !defined(BOOST_CONTAINER_FWD_BAD_DEQUE)
     template <class T, class Allocator> class deque;