rustup target add aarch64-unknown-linux-gnu

Set up the environment and build:

. /path/to/yocto/sdk/environment-setup-cortexa53-crypto-poky-linux
cd <PROJECT_ROOT>
mkdir build
cd build
cmake -DRust_CARGO_TARGET=aarch64-unknown-linux-gnu -DCMAKE_INSTALL_PREFIX=/slint/install/path ..
cmake --build .
cmake --install .