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diff --git a/src/third_party/boost-1.69.0/boost/iostreams/constants.hpp b/src/third_party/boost-1.69.0/boost/iostreams/constants.hpp
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+++ b/src/third_party/boost-1.69.0/boost/iostreams/constants.hpp
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+// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
+// (C) Copyright 2003-2007 Jonathan Turkanis
+// Distributed under 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.)
+
+// See http://www.boost.org/libs/iostreams for documentation.
+
+// Contains constants used by library.
+
+#ifndef BOOST_IOSTREAMS_CONSTANTS_HPP_INCLUDED
+#define BOOST_IOSTREAMS_CONSTANTS_HPP_INCLUDED
+
+#if defined(_MSC_VER)
+# pragma once
+#endif              
+
+#ifndef BOOST_IOSTREAMS_DEFAULT_DEVICE_BUFFER_SIZE
+# define BOOST_IOSTREAMS_DEFAULT_DEVICE_BUFFER_SIZE 4096
+#endif
+
+#ifndef BOOST_IOSTREAMS_DEFAULT_FILTER_BUFFER_SIZE
+# define BOOST_IOSTREAMS_DEFAULT_FILTER_BUFFER_SIZE 128
+#endif
+
+#ifndef BOOST_IOSTREAMS_DEFAULT_PBACK_BUFFER_SIZE
+# define BOOST_IOSTREAMS_DEFAULT_PBACK_BUFFER_SIZE 4
+#endif
+
+#include <boost/iostreams/detail/ios.hpp>  // streamsize.
+
+namespace boost { namespace iostreams {
+
+const std::streamsize default_device_buffer_size = 
+    BOOST_IOSTREAMS_DEFAULT_DEVICE_BUFFER_SIZE; 
+const std::streamsize default_filter_buffer_size = 
+    BOOST_IOSTREAMS_DEFAULT_FILTER_BUFFER_SIZE;
+const std::streamsize default_pback_buffer_size = 
+    BOOST_IOSTREAMS_DEFAULT_PBACK_BUFFER_SIZE;
+
+} } // End namespaces iostreams, boost.
+
+#endif // #ifndef BOOST_IOSTREAMS_CONSTANTS_HPP_INCLUDED