ruby@2.7 is keg-only, which means it was not symlinked into /usr/local, because this is an alternate version of another formula.
libpq is keg-only, which means it was not symlinked into /opt/homebrew, because conflicts with postgres formula.
gem
bundle
Keg-only
brew install [email protected]
apt install ruby
brew
pkgutil, /opt/homebrew/
installation
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