Disable std::vector as underlying sequence in old GCCs as we have compilation errors due to unsupported features.

test/flat_map_test.hpp

@@ -17,6 +17,7 @@
 #include <boost/move/iterator.hpp>
 #include <boost/move/utility_core.hpp>
 #include <boost/move/adl_move_swap.hpp>
+#include <cstdlib>
 
 #include <map>
 #include "map_test.hpp"

test/flat_tree_test.cpp

@@ -97,6 +97,10 @@ template class flat_tree
 }} //boost::container
 
 #if (BOOST_CXX_VERSION >= 201103L)
+//Old GCCs have problems (compiler bugs) with std::vector and flat_xxx
+#if !defined(BOOST_GCC) || (BOOST_GCC < 50000)
+// flat_map, std::vector
+
 #include <vector>
 
 namespace boost{
@@ -120,6 +124,7 @@ template class flat_tree
 }  //dtl {
 }} //boost::container
 
+#endif
 #endif
 
 int main ()