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

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

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+/*!
+@file
+Forward declares `boost::hana::basic_tuple`.
+
+@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_FWD_BASIC_TUPLE_HPP
+#define BOOST_HANA_FWD_BASIC_TUPLE_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/fwd/core/make.hpp>
+
+
+BOOST_HANA_NAMESPACE_BEGIN
+    //! @ingroup group-datatypes
+    //! Stripped down version of `hana::tuple`.
+    //!
+    //! Whereas `hana::tuple` aims to provide an interface somewhat close to a
+    //! `std::tuple`, `basic_tuple` provides the strict minimum required to
+    //! implement a closure with maximum compile-time efficiency.
+    //!
+    //!
+    //! Modeled concepts
+    //! ----------------
+    //! `Sequence`, and all the concepts it refines
+    template <typename ...Xs>
+    struct basic_tuple;
+
+    //! Tag representing `hana::basic_tuple`.
+    //! @relates hana::basic_tuple
+    struct basic_tuple_tag { };
+
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    //! Function object for creating a `basic_tuple`.
+    //! @relates hana::basic_tuple
+    //!
+    //! Given zero or more objects `xs...`, `make<basic_tuple_tag>` returns a
+    //! new `basic_tuple` containing those objects. The elements are held by
+    //! value inside the resulting tuple, and they are hence copied or moved
+    //! in. This is analogous to `std::make_tuple` for creating `basic_tuple`s.
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/basic_tuple/make.cpp
+    template <>
+    constexpr auto make<basic_tuple_tag> = [](auto&& ...xs) {
+        return basic_tuple<std::decay_t<decltype(xs)>...>{forwarded(xs)...};
+    };
+#endif
+
+    //! Alias to `make<basic_tuple_tag>`; provided for convenience.
+    //! @relates hana::basic_tuple
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/basic_tuple/make.cpp
+    constexpr auto make_basic_tuple = make<basic_tuple_tag>;
+BOOST_HANA_NAMESPACE_END
+
+#endif // !BOOST_HANA_FWD_BASIC_TUPLE_HPP