Installing on RPi (3 or 4):

curl https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
echo deb https://apt.llvm.org/bullseye llvm-toolchain-bullseye-14 main >/etc/apt/sources.list.d/llvm14.list
apt install llvm-14-tools llvm-14-dev clang build-essential cmake