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I’m not sure if it had to do with having OS X Yosemite, but I kept running into an issue when trying to install gems on my machine.

While trying to run the regular $ gem install, I would receive this message:

ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.

Meaning I couldn’t install any gems unless I ran $ sudo gem install each time i tried to install a gem.

So, somewhere on stackoverflow I found someone’s advice to install RVM (Ruby Version Manager).  But I hated the installation instructions on that site.  So I came across this blog post with step-by-step RVM installation instructions which ended up being really helpful: http://foffer.dk/install-ruby-on-os-x-10-10-yosemite-using-rvm/

And voila! You can now install gems without having to do the $ sudo command 😀  BUT WAIT.  You should take a look at the next link.

This post is also really helpful and includes more tips for when you’re installing gems and especially Rails with RVM: http://railsapps.github.io/installrubyonrails-mac.html

And I think that’s it for now!  Good luck and have fun!

– C.