3.24.3 (stable):

The tarball for 3.24.3 has been created with 'meson dist'.
If you build with Autotools from the tarball, please read the relevant
part of the README file.

Gtk:
* Actionable::get_action_target_value(): Fix ref count
  (Kjell Ahlstedt)

Documentation:
* Improve the documentation of Gtk::Application::add_window()
  and Gtk::Window::set_application()
  (Kjell Ahlstedt) Issue #56 (Daniel Boles)
* Gtk::Button::set_image(): Fix the documentation
  (Daniel Boles) Issue #58, merge request !22
* Gtk::TreeView::append_column(): Add code example
  (Pavlo Solntsev) Merge request !21
* README: Add instructions for building gtkmm
  (Kjell Ahlstedt)
* Explain key values
  (Kjell Ahlstedt) Issue #6 (Mark Vender)

Demos:
* Don't use C++14 auto deduction
  (Daniel Boles)
* Update the GLArea demo (similar to updates in gtk+)
  (Kjell Ahlstedt)
* GLArea demo: Fix a crash
  (Kjell Ahlstedt) Issue #63 (Gerlof Fokkema)

Tests:
* Builder test: Test derived props declared in C++
  (Daniel Boles) Merge request !23

Build:
* Improve NMake support
  (Chun-wei Fan)
* Fix Autotools build with X11 backend disabled (--enable-x11-backend=no)
  (Kjell Ahlstedt)
* Use __declspec(dllexport) when building with Visual Studio
  (Chun-wei Fan) Merge request !25
* Add support for building gtkmm with Meson
  (Chun-wei Fan, Kjell Ahlstedt) Merge request !24, !26
* docs/reference/: Update for Doxygen >= 1.8.16
  (Kjell Ahlstedt)