flatpak/shared-modules/SDL2/README.md

This SDL2 module is intended for use with flatpaks that rely on SDL2.

If your app or game wants to use a newer version of SDL2, or default to Wayland, you can use this. Set the following permissions for using Wayland:

socket=wayland
socket=fallback-x11
share=ipc

This SDL2 module contains two manifests; one containing SDL2 without libdecor, and the other with.

If your application utilizes SDL2 but doesn't work on Wayland, even with libdecor, you might opt for the -no-libdecor manifest, and disable Wayland support.

Otherwise, flatpak maintainers can use the -with-libdecor manifest.