Call Brew Install Ruby From Mathematica Wolfram Kernel Jun 13th, 2021 • Permalink RegisterExternalEvaluator["Ruby", "/usr/local/opt/ruby/bin/ruby"] ExternalEvaluate["Ruby", "RUBY_VERSION"] It’s works even exit in wolfram kernel, for Mathematica in Apple Silicon: gem install ffi-rzmq RegisterExternalEvaluator["Ruby", "/opt/homebrew/opt/ruby/bin/ruby"] ExternalEvaluate["Ruby", "RUBY_VERSION"]