In 2023 the answer is similar but different: Xcode > Preferences Platforms Tab Click the lower left hand + button Select the versions you want to download.

This article https://wojciechkulik.pl/xcode/xcode-cloud-overview-and-setup suggests putting these lines at the beginning of your script echo 'export GEM_HOME=$HOME/gems' >>~/.bash_profile echo 'export PATH=$HOME/gems/bin:$PATH' >>~/.bash_profile export GEM_HOME=$HOME/gems export PATH="$GEM_HOME/bin:$PATH"