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diff --git a/boost/geometry/algorithms/detail/is_valid/debug_validity_phase.hpp b/boost/geometry/algorithms/detail/is_valid/debug_validity_phase.hpp
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+++ b/boost/geometry/algorithms/detail/is_valid/debug_validity_phase.hpp
@@ -0,0 +1,68 @@
+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2014, Oracle and/or its affiliates.
+
+// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
+
+// Licensed under the Boost Software License version 1.0.
+// http://www.boost.org/users/license.html
+
+#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_DEBUG_VALIDITY_PHASE_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_DEBUG_VALIDITY_PHASE_HPP
+
+#ifdef GEOMETRY_TEST_DEBUG
+#include <iostream>
+
+#include <boost/geometry/core/tag.hpp>
+#include <boost/geometry/core/tags.hpp>
+#endif
+
+
+namespace boost { namespace geometry
+{
+
+namespace detail { namespace is_valid
+{
+
+template <typename Geometry, typename Tag = typename tag<Geometry>::type>
+struct debug_validity_phase
+{
+    static inline void apply(int)
+    {
+    }
+};
+
+#ifdef BOOST_GEOMETRY_TEST_DEBUG
+template <typename Polygon>
+struct debug_validity_phase<Polygon, polygon_tag>
+{
+    static inline void apply(int phase)
+    {
+        switch (phase)
+        {
+        case 1:
+            std::cout << "checking exterior ring..." << std::endl;
+            break;
+        case 2:
+            std::cout << "checking interior rings..." << std::endl;
+            break;
+        case 3:
+            std::cout << "computing and analyzing turns..." << std::endl;
+            break;
+        case 4:
+            std::cout << "checking if holes are inside the exterior ring..."
+                      << std::endl;
+            break;
+        case 5:
+            std::cout << "checking connectivity of interior..." << std::endl;
+            break;
+        }
+    }
+};
+#endif
+
+}} // namespace detail::is_valid
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_DEBUG_VALIDITY_PHASE_HPP