Thanks for this information. Then, I'll try first to compile it on my Rasperry Pi.

Actually, I've one more question. The application which I want to compile is a flight navigation app which needs access to GPS data. In order to check if there is GPS access within flatpak, I've installed your Puremaps application, the one which is available on flathub. Unfortunately, geolocation is not working for this app on my Xperia 10 with the official Sailfish OS. Is it possible to enable geolocation for flatpak apps? Do I just need to set the proper finish-args like, e.g., "--allow=geolocation"?