// Start background info.
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
// end background info.
rbenv does the dirty work for you if loaded correctly, but if you need to change the global setting, you can always update it:
rbenv global 2.3.0
Then you can check that's properly applied with:
* indicates the currently active
ruby. Test with:
That should be the version you're asking for.
rbenv is a lot better than the system ruby, so I hope it works out for you.