Although I’m not a Ruby developer, I encounter Ruby in many places as a user. This page collects some notes on using Ruby on Mac OS X.

Upgrade Ruby

Mac OS X comes with Ruby installed. The stock setup … is annoying to say the least, so the steps below install the latest version in a user-based virtual environment.

Kudos to https://luther.io/macos/how-to-install-latest-ruby-on-a-mac/.

Install Homebrew

DUH ;-)

Install rbenv

$ brew install rbenv ruby-build rbenv-gemset rbenv-vars
...
$ rbenv init
...
$ curl -fsSL https://github.com/rbenv/rbenv-installer/raw/main/bin/rbenv-doctor | bash
...
$ rbenv install 3.0.2
...
$ rbenv global 3.0.2

Edit ~/.zshrc

export RUBY_CONFIGURE_OPTS="--with-openssl-dir=$(brew --prefix openssl@1.1)"
eval "$(rbenv init -)"