stabilize build system: depends, installer, boost/bdb fixes, cross targets groundwork

depends/x86_64-pc-linux-gnu/include/boost/log/detail/asio_fwd.hpp

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+/*
+ *          Copyright Andrey Semashev 2007 - 2015.
+ * 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)
+ */
+/*!
+ * \file   asio_fwd.hpp
+ * \author Andrey Semashev
+ * \date   20.04.2008
+ *
+ * \brief  This header is the Boost.Log library implementation, see the library documentation
+ *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
+ *
+ * The header provides forward declarations of Boost.ASIO that are required for the user's
+ * code to compile with Boost.Log. The forward declarations allow to avoid including the major
+ * part of Boost.ASIO and system headers into user's code.
+ */
+
+#ifndef BOOST_LOG_DETAIL_ASIO_FWD_HPP_INCLUDED_
+#define BOOST_LOG_DETAIL_ASIO_FWD_HPP_INCLUDED_
+
+#include <boost/log/detail/config.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+
+namespace asio {
+
+namespace ip {
+
+class address;
+
+} // namespace ip
+
+} // namespace asio
+
+} // namespace boost
+
+#endif // BOOST_LOG_DETAIL_ASIO_FWD_HPP_INCLUDED_