Recently the Freedesktop SDK documentation has been completely reworked, and as part of it it received a new section targetting Flatpak application developers wanting to target the Freedesktop SDK runtimes. You can find it here: The Freedesktop Flatpak SDK. While most of Freedesktop SDK’s documentation before that explained how to use it as a base to create you own OS or Flatpak runtimes, none explained how to consume it as-is, which is a shame as it is used as is, there are some applications o...