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

depends/x86_64-pc-linux-gnu/include/boost/vmd/seq/push_back.hpp

@@ -0,0 +1,53 @@
+
+//  (C) Copyright Edward Diener 2015
+//  Use, modification and distribution are 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).
+
+#if !defined(BOOST_VMD_SEQ_PUSH_BACK_HPP)
+#define BOOST_VMD_SEQ_PUSH_BACK_HPP
+
+#include <boost/vmd/detail/setup.hpp>
+
+#if BOOST_PP_VARIADICS
+
+#include <boost/preprocessor/control/iif.hpp>
+#include <boost/preprocessor/seq/push_back.hpp>
+#include <boost/vmd/identity.hpp>
+#include <boost/vmd/is_empty.hpp>
+
+/*
+
+  The succeeding comments in this file are in doxygen format.
+
+*/
+
+/** \file
+*/
+
+/** \def BOOST_VMD_SEQ_PUSH_BACK(seq,elem)
+
+    \brief appends an element to the end of a seq. 
+
+    seq = seq to to append an element to.
+    elem  = element to append.
+
+    If the seq is an empty seq the result is a seq with the single element.
+    Otherwise the result is a seq after adding the element to the end.
+*/
+
+#define BOOST_VMD_SEQ_PUSH_BACK(seq,elem) \
+    BOOST_VMD_IDENTITY_RESULT \
+        ( \
+        BOOST_PP_IIF \
+            ( \
+            BOOST_VMD_IS_EMPTY(seq), \
+            BOOST_VMD_IDENTITY((elem)), \
+            BOOST_PP_SEQ_PUSH_BACK \
+            ) \
+        (seq,elem) \
+        ) \
+/**/
+
+#endif /* BOOST_PP_VARIADICS */
+#endif /* BOOST_VMD_SEQ_PUSH_BACK_HPP */