libsigc++ 2.0.7 compile warning

[Rob Benton <rob benton conwaycorp net>]

Anybody seen this before:

In file included from /usr/include/sigc++-2.0/sigc++/signal_base.h:26,
                 from /usr/include/sigc++-2.0/sigc++/signal.h:8,
                 from /usr/include/sigc++-2.0/sigc++/sigc++.h:23,
                 from /usr/include/glibmm-2.4/glibmm/dispatcher.h:24,
                 from /usr/include/glibmm-2.4/glibmm.h:32,
                 from /usr/include/gtkmm-2.4/gtkmm/box.h:6,
                 from Instruction.h:4,
                 from EmptyChip.h:4,
                 from EmptyChip.C:1:
/usr/include/sigc++-2.0/sigc++/type_traits.h:96: warning: all member 
functions
   in class `sigc::is_base_and_derived<T_base, T_derived>' are private


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I upgraded to 2.0.7 today and this just started appearing.