This is the official Dylan tap for homebrew.
Mac users can use these formulae to easily install and update Open Dylan and other tools.
If you don't have homebrew, install it from their homepage.
Then, add this tap:
brew tap dylan-lang/dylan
To install Open Dylan:
brew install opendylan
Simply run:
brew upgrade opendylan
Thanks for the Dart folks whose README, I largely copied and for motivating me to get this going for Dylan.