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   $ yaourt -S rbenv
   $ rbenv --version
   rbenv 1.1.1

   $ git clone https://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
   $ rbenv install --list
   ...

   $ rbenv install 2.5.1
   $ rbenv global 2.5.1

   $ echo "eval "(rbenv init -)" >> ~/.zshrc
#Archlinux