sudo apt-get install flatpak
flatpak remote-add --if-not-exists --user flathub \
https://dl.flathub.org/repo/flathub.flatpakrepo
flatpak install --user flathub org.flatpak.Builder
flatpak install --user flathub org.gnome.Sdk/x86_64/47
flatpak install --user flathub org.gnome.Platform/x86_64/47
flatpak install --user org.freedesktop.Sdk.Extension.rust-stable
flatpak install --user org.freedesktop.Sdk.Extension.llvm18
cd gtk
flatpak run org.flatpak.Builder \
--user --disable-rofiles-fuse --repo=repo \
flatpak_app build-aux/io.github.tsirysndr.Rockbox.json --force-clean
flatpak run org.flatpak.Builder \
--run flatpak_app build-aux/io.github.tsirysndr.Rockbox.json rockbox-gtk