You'll need the following dependencies:

• libgranite-dev >= 7.0
• libgtk-4-dev
• meson >= 0.56.0
• valac

Run meson build to configure the build environment. Change to the build directory and run ninja test to build and run automated tests

meson build --prefix=/usr
cd build
ninja test

To install, use ninja install, then execute with io.elementary.calculator

sudo ninja install
io.elementary.calculator