cd llvm-project-15.0.7
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release \
      -DLLVM_ENABLE_RTTI=ON \
      -DLLVM_TARGETS_TO_BUILD="X86" \
      -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" \
      -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" \
      -DLLVM_ENABLE_ZLIB=OFF \
      -DLLVM_ENABLE_ZSTD=OFF \
      -DLLVM_ENABLE_TERMINFO=OFF \
      -DLLVM_BUILD_LLVM_DYLIB=ON \
      -DLLVM_LINK_LLVM_DYLIB=ON \
      -DCMAKE_INSTALL_PREFIX=<install_path> ../llvm
cmake --build .
cmake --build . --target install

git clone https://github.com/ampersand-projects/tilt.git --recursive
mkdir build
cd build
cmake -DLLVM_DIR=<install_path>/lib/cmake/llvm ..
cmake --build .