From Fedora Project Wiki
Setup Development environment
sudo dnf install module-build-service python2-virtualenv mkdir -p ~/.virtualenvs virtualenv-2 ~/.virtualenvs/modularity --system-site-packages --prompt='(modularity) ' . ~/.virtualenvs/modularity/bin/activate sudo dnf install golang go get -u github.com/openshift/imagebuilder/cmd/imagebuilder git clone https://pagure.io/forks/otaylor/fm-orchestrator.git ( cd fm-orchestrator && pip install -e . ) git clone https://pagure.io/flatpak-module-tools.git ( cd flatpak-module-tools && pip install -e . )
Check out runtime prototype and example application
git clone -b f26 https://github.com/owtaylor/module-flatpak-runtime.git modules/flatpak-runtime git clone -b f26 https://github.com/owtaylor/module-eog.git modules/eog git clone -b f26 https://github.com/owtaylor/rpm-flatpak-rpm-macros.git rpms/flatpak-rpm-macros git clone -b f26 https://github.com/owtaylor/rpm-flatpak-runtime-config.git rpms/flatpak-runtime-config
Building and install the runtime
cd modules/flatpak-runtime # Edit flatpak-runtime.yaml and change file:// URLs to point to rpm-flatpak-macros and rpm-flatpak-config # checkouts # Downloads gigs of packages into ~/modulebuild/cache/ and writes a build in ~/modulebuild/builds/ mbs-build local # Creates a flatpak bundle in ~/modulebuild/flatpaks/ flatpak-module create-flatpak --runtime -l flatpak-runtime:f26 --module flatpak-runtime --info flatpak.json flatpak-install --user <path_to_bundle>
Build and install the application
cd modules/eog mbs-build local flatpak-module create-flatpak -l flatpak-runtime:eog -l eog:f26 --module eog --info flatpak.json flatpak-install --user <path_to_bundle>
Try running the application
flatpak run org.gnome.eog