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

depends/x86_64-pc-linux-gnu/include/boost/log/expressions/attr_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   attr_fwd.hpp
+ * \author Andrey Semashev
+ * \date   21.07.2012
+ *
+ * The header contains forward declaration of a generic attribute placeholder in template expressions.
+ */
+
+#ifndef BOOST_LOG_EXPRESSIONS_ATTR_FWD_HPP_INCLUDED_
+#define BOOST_LOG_EXPRESSIONS_ATTR_FWD_HPP_INCLUDED_
+
+#include <boost/log/detail/config.hpp>
+#include <boost/log/attributes/fallback_policy_fwd.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+
+#ifndef BOOST_LOG_DOXYGEN_PASS
+
+namespace phoenix {
+
+template< typename >
+struct actor;
+
+} // namespace phoenix
+
+#endif
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace expressions {
+
+/*!
+ * An attribute value extraction terminal
+ */
+template<
+    typename T,
+    typename FallbackPolicyT = fallback_to_none,
+    typename TagT = void
+>
+class attribute_terminal;
+
+/*!
+ * An attribute value extraction terminal actor
+ */
+template<
+    typename T,
+    typename FallbackPolicyT = fallback_to_none,
+    typename TagT = void,
+    template< typename > class ActorT = phoenix::actor
+>
+class attribute_actor;
+
+} // namespace expressions
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#endif // BOOST_LOG_EXPRESSIONS_ATTR_FWD_HPP_INCLUDED_