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gem list --local | grep cocoapods | awk '{print $1}' | xargs sudo gem uninstall
and then run:
brew remove rbenv
sudo rm -rf ~/.rbenv
sudo arch -x86_64 gem install ffi
sudo arch -x86_64 gem install cocoapods
brew install rbenv
rbenv install 3.0.1
rbenv global 3.0.1
pod install