TruffleRuby needs LLVM to run and build C extensions - version 3.8, 3.9 or 4.0.
LLVM 5.0 should also work but is not actively tested.
For using C extensions:
apt-get install libc++-dev libc++abi1
Note that we install libc++-dev here, as installing libc++ seems to
introduce some system conflicts.
Additionally, for building C extensions:
apt-get install clang llvm libc++abi-dev
For using C extensions:
sudo dnf install libcxx libcxxabi
Additionally, for building C extensions:
sudo dnf install clang llvm libcxx-devel
We need the opt command, so you can't just use what is installed by Xcode if
you are on macOS. We would recommend that you install LLVM 4 via
Homebrew and then manually set your path.
brew install llvm@4
export PATH="/usr/local/opt/llvm@4/bin:$PATH"