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How to Install Ruby in OSX
Step 5: How to Install Ruby in OSX
Installing Ruby
Even though OSX comes with Ruby preinstalled the version it ships with is out of date.
To update to the needed version of Ruby with RVM you simply need to type in the terminal:
rvm install 1.9.3
This will install Ruby version 1.9.3 and make it available for use. This step will take a little while to execute as it will download and compile the specified version of Ruby specifically for your system.