2.51.1: This is the first release of the glibmm-2.52 API/ABI. It installs in parallel with the gtkmm-2.4 API/ABI, of which the most recent version is glibmm 2.50. We know that is a bit confusing. We are taking the opportunity to do this glibmm ABI break while GTK+ (and therefore gtkmm) is also doing an ABI break. But we cannot call this glibmm-3.0 because there is no glib 3.0. Build: * Require C++14. (Murray Cumming) * Use libsigc++-3.0 instead of libsigc++-2.0. https://www.murrayc.com/permalink/2016/03/07/libsigc-3-0-very-variadic/ (Murray Cumming) * Remove lots of deprecated API. (Kjell Ahlstedt) Gio: * BufferedInputStream, InputStream, OutputStream: Add vfuncs, allowing implementation in C++. (Krzysztof KosiƄski, Kjell Ahlstedt) Bug #572471 * SettingsSchemaSource::get_default(): Correct the reference count. (Marcin Kolny) Bug #774593 * Settings: Fix type of 'key' parameter of writable-change-event signal (Marcin Kolny) Bug #773977 Glib: * ustring: Add cbegin() and cend().