Installing CocoaPods

The installation instructions for CocoaPods are unfortunately out of date for later versions of macOS. Essentially, Apple stopped shipping a complete version of Ruby, so the Gem install fails.

I got around this by installing Ruby etc. via Homebrew

brew install rbenv ruby-build ruby

After that, I had to set up the relevant symbolic links manually

cd /usr/local/bin
ln -s ../Cellar/ruby/3.2.2_1/bin/* .

Finally, I had to add an extra parameter to the Gem install command

sudo gem install -n /usr/local/bin cocoapods