In case someone gets errors trying to install ruby 2.7.3, apparently something changed after Xcode 12 which breaks the install process with rbenv:
I kept getting this, even though I have the latest versions of psych and libyaml installed:
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
I tried the workaround they suggest in the guide, but I kept getting the same error and ended up having to use rvm:
rvm install 2.7.3
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