--- ./boost_1_59_0/boost/geometry/core/exception.hpp	2015-08-03 14:51:49.000000000 +0200
+++ ./boost_1_59_0/boost/geometry/core/exception.hpp	2015-08-31 17:43:29.724002700 +0200
@@ -32,6 +32,7 @@
 */
 class exception : public std::exception
 {
+public:
     virtual char const* what() const throw()
     {
         return "Boost.Geometry exception";