Installing on RPi (3 or 4):

```shell
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 clang build-essential cmake git \ 
    llvm-14-dev libboost-log-dev spirv-headers spirv-tools
```

Clone the source, then in the source dir:

```shell
git submodule update --init vendor/shaderc
vendor/shaderc/utils/git-sync-deps
mkdir build
cd build
cmake -DCMAKE_BUILD_PROFILE=Release ..
# Note: just running `make` will fail with a link error in render_stub.c; ignore this. 
make bluebell
```