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Install Homebrew:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
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Install OpenSSL libraries:
brew install openssl
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Install RVM and Ruby:
curl -sSL https://get.rvm.io | bash -s stable # In a new session (restart your terminal or open new tab): rvm install 2.5.1 --default --with-openssl-dir=`brew --prefix openssl`
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Set up RVM gemset:
rvm gemset create cool_app rvm use 2.5.1@cool_app gem update --system gem update bundler gem install nokogiri -- --use-system-libraries=true --with-xml2-include=`xcrun --show-sdk-path`/usr/include/libxml2