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

depends/x86_64-pc-linux-gnu/include/boost/hana/value.hpp

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+/*!
+@file
+Defines `boost::hana::value`.
+
+@copyright Louis Dionne 2013-2017
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+ */
+
+#ifndef BOOST_HANA_VALUE_HPP
+#define BOOST_HANA_VALUE_HPP
+
+#include <boost/hana/fwd/value.hpp>
+
+#include <boost/hana/concept/constant.hpp>
+#include <boost/hana/concept/integral_constant.hpp>
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/dispatch.hpp>
+
+#include <type_traits>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    template <typename C, bool condition>
+    struct value_impl<C, when<condition>> : default_ {
+        template <typename ...Args>
+        static constexpr auto apply(Args&& ...args) = delete;
+    };
+
+    template <typename T>
+    constexpr decltype(auto) value() {
+        using RawT = typename std::remove_cv<
+            typename std::remove_reference<T>::type
+        >::type;
+        using C = typename hana::tag_of<RawT>::type;
+        using Value = BOOST_HANA_DISPATCH_IF(
+            value_impl<C>, hana::Constant<C>::value
+        );
+
+    #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
+        static_assert(hana::Constant<C>::value,
+        "hana::value<T>() requires 'T' to be a Constant");
+    #endif
+
+        return Value::template apply<RawT>();
+    }
+
+    template <typename I>
+    struct value_impl<I, when<hana::IntegralConstant<I>::value>> {
+        template <typename C>
+        static constexpr auto apply()
+        { return C::value; }
+    };
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_VALUE_HPP