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

depends/x86_64-pc-linux-gnu/include/boost/archive/tmpdir.hpp

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+#ifndef BOOST_ARCHIVE_TMPDIR_HPP
+#define BOOST_ARCHIVE_TMPDIR_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// tmpdir.hpp:
+
+// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 
+// Use, modification and distribution is subject to 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 for updates, documentation, and revision history.
+
+#include <cstdlib> // getenv
+#include <cstddef> // NULL
+//#include <boost/assert.hpp>
+
+#include <boost/config.hpp>
+#ifdef BOOST_NO_STDC_NAMESPACE
+namespace std {
+    using ::getenv;
+}
+#endif
+
+namespace boost {
+namespace archive {
+
+inline const char * tmpdir(){
+    const char *dirname;
+    dirname = std::getenv("TMP");
+    if(NULL == dirname)
+        dirname = std::getenv("TMPDIR");
+    if(NULL == dirname)
+        dirname = std::getenv("TEMP");
+    if(NULL == dirname){
+        //BOOST_ASSERT(false); // no temp directory found
+        dirname = ".";
+    }
+    return dirname;
+}
+
+} // archive
+} // boost
+
+#endif // BOOST_ARCHIVE_TMPDIR_HPP