You'll need the following dependencies:
gobject-introspection
libglib2.0-dev
libgranite-7-dev >= 7.0.0
libwingpanel-9-dev
meson >= 0.58.0
valac
Run meson to configure the build environment and then ninja to build
meson build --prefix=/usr
cd build
ninja
To install, use ninja install
sudo ninja install