This repository contains a number of commandline utilities for use inside Flatpak sandboxes. They work by talking to portals.
Currently, there is flatpak-spawn for running commands in sandboxes as well as xdg-open and xdg-email, which are compatible with the well-known scripts of the same name.
See http://flatpak.org/ for more information.
This repository uses meson to build. Just do
meson [args] build
ninja -Cbuild
ninja -Cbuild install
The tools in flatpak-xdg-utils are only useful inside a Flatpak sandbox.