How I can fix the error "you don't have write permissions for the /library/ruby/gems/2.3.0 directory."

Question

I got the "You don't have write permissions for the /Library/Ruby/Gems/2.3.0 directory. " error when I add gem install bundler in the Terminal. Below is the steps that I applied for my specs to install RSpec:

Run gem installer within the directory root of your application.
Run bundle install.
To run a single spec file, run a command like this: bundle exec rspec spec/00_hello_spec.rb.
To run all specifications at once, execute bundle execute RSP

thaley · Answer

You can install ruby that use homebrew

brew install ruby
export GEM_HOME="$HOME/.gem"
gem install rails

Include export GEM_HOME="$HOME/.gem" to the ~/.bash_profile or .zshrc if zsh is being used in your system.

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How I can fix the error “you don’t have write permissions for the /library/ruby/gems/2.3.0 directory.”