diff --git a/include/boost/functional/detail/container_fwd.hpp b/include/boost/functional/detail/container_fwd.hpp
index fff0d0f..8b6b2be 100644
--- a/include/boost/functional/detail/container_fwd.hpp
+++ b/include/boost/functional/detail/container_fwd.hpp
@@ -30,10 +30,17 @@
 #include <bitset>
 #endif
 
+#if BOOST_WORKAROUND(__GNUC__, < 3) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
+#define BOOST_HASH_CHAR_TRAITS string_char_traits
+#else
+#define BOOST_HASH_CHAR_TRAITS char_traits
+#endif
+
 namespace std
 {
     template <class T> class allocator;
     template <class charT, class traits, class Allocator> class basic_string;
+    template <class charT> struct BOOST_HASH_CHAR_TRAITS;
 
 #if BOOST_WORKAROUND(__GNUC__, < 3) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
     template <class charT> class string_char_traits;
@@ -65,6 +72,7 @@ namespace std
 #if !defined(BOOST_CONTAINER_FWD_BAD_BITSET)
     template <size_t N> class bitset;
 #endif
+    template <class T1, class T2> struct pair;
 }
 
 #endif