You'll need the following dependencies:
- libaccountsservice-dev
- libgirepository1.0-dev
- libgnome-desktop-3-dev
- libgranite-dev
- libhandy-1-dev >= 0.90.0
- libpolkit-gobject-1-dev
- libpwquality-dev
- libswitchboard-2.0-dev
- meson >= 0.46.1
- policykit-1
- valac
Run meson build to configure the build environment and then change to the build directory and run ninja to build
meson build --prefix=/usr
cd build
ninja
To install, use ninja install
sudo ninja install