boost 1.53 (shipped with fedora 19) needs the patch (wich is included in boost 1.54) from https://svn.boost.org/trac/boost/ticket/8102

when used with clang++ for compiling code using boost::signals2::signal

Othewise, compiling code like this fails:

  #include <boost/signals2/signal.hpp>
  int main()
  {
    boost::signals2::signal<void()> s;
    s();
  }

Compiled using 
  clang++ -c --std=c++11 

The boost patch is not needed for compiling using g++ (4.8.1).

Note:
g++     --version = g++ (GCC) 4.8.1 20130603 (Red Hat 4.8.1-1)
clang++ --version = clang version 3.3 (tags/RELEASE_33/rc3)

Compiler error:
In file included from test.cpp:1:
In file included from /usr/include/boost/signals2/signal.hpp:38:
In file included from /usr/include/boost/signals2/variadic_signal.hpp:21:
/usr/include/boost/signals2/detail/variadic_slot_invoker.hpp:89:16: error: no matching function for call to 'get'
          func(std::get<indices>(args)...);
               ^~~~~~~~~~~~~~~~~