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diff --git a/contrib/python/matplotlib/py3/extern/agg24-svn/include/agg_conv_concat.h b/contrib/python/matplotlib/py3/extern/agg24-svn/include/agg_conv_concat.h
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+++ b/contrib/python/matplotlib/py3/extern/agg24-svn/include/agg_conv_concat.h
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+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.4
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software 
+// is granted provided this copyright notice appears in all copies. 
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+//          mcseemagg@yahoo.com
+//          http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_CONV_CONCAT_INCLUDED
+#define AGG_CONV_CONCAT_INCLUDED
+
+#include "agg_basics.h"
+
+namespace agg
+{
+    //=============================================================conv_concat
+    // Concatenation of two paths. Usually used to combine lines or curves 
+    // with markers such as arrowheads
+    template<class VS1, class VS2> class conv_concat
+    {
+    public:
+        conv_concat(VS1& source1, VS2& source2) :
+            m_source1(&source1), m_source2(&source2), m_status(2) {}
+        void attach1(VS1& source) { m_source1 = &source; }
+        void attach2(VS2& source) { m_source2 = &source; }
+
+
+        void rewind(unsigned path_id)
+        { 
+            m_source1->rewind(path_id);
+            m_source2->rewind(0);
+            m_status = 0;
+        }
+
+        unsigned vertex(double* x, double* y)
+        {
+            unsigned cmd;
+            if(m_status == 0)
+            {
+                cmd = m_source1->vertex(x, y);
+                if(!is_stop(cmd)) return cmd;
+                m_status = 1;
+            }
+            if(m_status == 1)
+            {
+                cmd = m_source2->vertex(x, y);
+                if(!is_stop(cmd)) return cmd;
+                m_status = 2;
+            }
+            return path_cmd_stop;
+        }
+
+    private:
+        conv_concat(const conv_concat<VS1, VS2>&);
+        const conv_concat<VS1, VS2>& 
+            operator = (const conv_concat<VS1, VS2>&);
+
+        VS1* m_source1;
+        VS2* m_source2;
+        int  m_status;
+
+    };
+}
+
+
+#endif