diff --git a/include/boost/fusion/sequence/adapted/variant/detail/category_of_impl.hpp b/include/boost/fusion/sequence/adapted/variant/detail/category_of_impl.hpp
new file mode 100644
index 00000000..44db65fd
--- /dev/null
+++ b/include/boost/fusion/sequence/adapted/variant/detail/category_of_impl.hpp
@@ -0,0 +1,34 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 Joel de Guzman
+    Copyright (c) 2005-2006 Dan Marsden
+
+    Use, modification and distribution is subject to the Boost Software
+    License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+    http://www.boost.org/LICENSE_1_0.txt)
+==============================================================================*/
+#if !defined(BOOST_FUSION_VARIANT_CATEGORY_OF_IMPL_13112006_0802)
+#define BOOST_FUSION_VARIANT_CATEGORY_OF_IMPL_13112006_0802
+
+namespace boost { namespace fusion { 
+
+    struct variant_tag;
+    struct forward_traversal_tag;
+
+    namespace extension
+    {
+        template<typename T>
+        struct category_of_impl;
+
+        template<>
+        struct category_of_impl<variant_tag>
+        {
+            template<typename T>
+            struct apply
+            {
+                typedef forward_traversal_tag type;
+            };
+        };
+    }
+}}
+
+#endif
diff --git a/include/boost/fusion/sequence/adapted/variant/detail/is_sequence_impl.hpp b/include/boost/fusion/sequence/adapted/variant/detail/is_sequence_impl.hpp
new file mode 100644
index 00000000..373ddd4a
--- /dev/null
+++ b/include/boost/fusion/sequence/adapted/variant/detail/is_sequence_impl.hpp
@@ -0,0 +1,32 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 Joel de Guzman
+    Copyright (c) 2005-2006 Dan Marsden
+
+    Use, modification and distribution is subject to the Boost Software
+    License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+    http://www.boost.org/LICENSE_1_0.txt)
+==============================================================================*/
+#if !defined(BOOST_FUSION_VARIANT_IS_SEQUENCE_IMPL_13112006_0748)
+#define BOOST_FUSION_VARIANT_IS_SEQUENCE_IMPL_13112006_0748
+
+#include <boost/mpl/bool.hpp>
+
+namespace boost { namespace fusion {
+
+    struct variant_tag;
+
+    namespace extension
+    {
+        template<typename Tag>
+        struct is_sequence_impl;
+
+        template<>
+        struct is_sequence_impl<variant_tag>
+        {
+            template<typename Sequence>
+            struct apply : mpl::true_ {};
+        };
+    }
+}}
+
+#endif
diff --git a/include/boost/fusion/sequence/adapted/variant/detail/is_view_impl.hpp b/include/boost/fusion/sequence/adapted/variant/detail/is_view_impl.hpp
new file mode 100644
index 00000000..f17666da
--- /dev/null
+++ b/include/boost/fusion/sequence/adapted/variant/detail/is_view_impl.hpp
@@ -0,0 +1,32 @@
+/*=============================================================================
+    Copyright (c) 2001-2006 Joel de Guzman
+    Copyright (c) 2005-2006 Dan Marsden
+
+    Use, modification and distribution is subject to the Boost Software
+    License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+    http://www.boost.org/LICENSE_1_0.txt)
+==============================================================================*/
+#if !defined(BOOST_FUSION_VARIANT_IS_VIEW_IMPL_13112006_0749)
+#define BOOST_FUSION_VARIANT_IS_VIEW_IMPL_13112006_0749
+
+#include <boost/mpl/bool.hpp>
+
+namespace boost { namespace fusion {
+
+    struct variant_tag;
+
+    namespace extension
+    {
+        template<typename Tag>
+        struct is_view_impl;
+
+        template<>
+        struct is_view_impl<variant_tag>
+        {
+            template<typename Sequence>
+            struct apply : mpl::false_ {};
+        };
+    }
+}}
+
+#endif