--- ./inc/preferencesdialog.hpp.orig 2012-01-30 01:27:51.000000000 +0100 +++ ./inc/preferencesdialog.hpp 2014-07-24 13:12:17.000000000 +0200 @@ -198,7 +198,7 @@ protected: struct LangCompare { - bool operator()(GtkSourceLanguage* first, GtkSourceLanguage* second) + bool operator()(const GtkSourceLanguage* first, const GtkSourceLanguage* second) const { return first < second; }