This document assumes that you are using a GNU/Linux enviroment. If you are running on Windows, WSL or a VM should work.
sudo dnf install texinfo binutils-devel curl cmake mpfr-devel libmpc-devel gmp-devel patch @"C Development Tools and Libraries" git
sudo zypper install curl cmake mpfr-devel mpc-devel gmp-devel patch gcc gcc-c++ patterns-devel-C-C++-devel_C_C++ git
sudo xbps-install -S base-devel cmake curl mpfr-devel libmpc-devel gmp-devel git
apt-get install curl cmake libmpc-devel gmp-devel libmpfr-devel patch git
git clone --depth 1 --recurse-submodules --shallow-submodules https://github.com/xslendix/yros.git
cd yros
Since this project uses buildroot as a submodule, --recurse-submodules is required. The repositories are also shallow cloned so it doesn't take too much time just to get everything downloaded.
make rpi3_64-gui
# OR
make rpi4_64-gui
make rpi3_64-nogui
# OR
make rpi4_64-nogui
A typical build on my machine takes ~2 hours. Of course, for you it may take longer or less, so be sure to have something to do while you're waiting.
The output image file can be found at buildroot/output/images.img.