For https://home-assistant.io/developers/website/ I need to install ruby 2.3.1. Have tried https://github.com/postmodern/ruby-install with ruby-install --system ruby 2.3.1
on Mac and it fails with the unhelpful !!! Installation of ruby 2.3.1 failed!
How to install??
Tried at least 3 different ways to install but this finally worked:
brew install ruby-build
brew install rbenv
rbenv install 2.3.1