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

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

@@ -0,0 +1,51 @@
+
+//  (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_POP_BACK_HPP)
+#define BOOST_VMD_SEQ_POP_BACK_HPP
+
+#include <boost/vmd/detail/setup.hpp>
+
+#if BOOST_PP_VARIADICS
+
+#include <boost/preprocessor/comparison/equal.hpp>
+#include <boost/preprocessor/control/iif.hpp>
+#include <boost/preprocessor/seq/pop_back.hpp>
+#include <boost/preprocessor/seq/size.hpp>
+#include <boost/vmd/empty.hpp>
+
+/*
+
+  The succeeding comments in this file are in doxygen format.
+
+*/
+
+/** \file
+*/
+
+/** \def BOOST_VMD_SEQ_POP_BACK(seq)
+
+    \brief pops an element from the end of a seq. 
+
+    seq = seq to pop an element from.
+
+    If the seq is an empty seq the result is undefined.
+    If the seq is a single element the result is an empty seq.
+    Otherwise the result is a seq after removing the last element.
+*/
+
+#define BOOST_VMD_SEQ_POP_BACK(seq) \
+    BOOST_PP_IIF \
+        ( \
+        BOOST_PP_EQUAL(BOOST_PP_SEQ_SIZE(seq),1), \
+        BOOST_VMD_EMPTY, \
+        BOOST_PP_SEQ_POP_BACK \
+        ) \
+    (seq) \
+/**/
+
+#endif /* BOOST_PP_VARIADICS */
+#endif /* BOOST_VMD_SEQ_POP_BACK_HPP */