Install libflatpak-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libflatpak-dev
Description:
Application deployment framework for desktop apps (development)
Flatpak installs, manages and runs sandboxed desktop application bundles. See the flatpak package for a more comprehensive description. . This package contains development headers and pkg-config metadata for libflatpak0.
Homepage: http://flatpak.org/
Version: 0.11.3-3
Section: universe/libdevel