2.5.1 (unstable): * Use (and require) C++11 (Kjell Ahlstedt) * Using C++11 lambda functions to create sigc::slots: Avoid the need for SIGC_FUNCTORS_DEDUCE_RESULT_TYPE_WITH_DECLTYPE. (Kjell Ahlstedt) * Remove the already-deprecated sigc::lambda (and sigc::group) API. This is an API change but should not be an ABI change, so it should only affect you when rebuilding applications, if you use this API. (Murray Cumming, Kjell Ahlstedt)