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Whenever you want to upgrade Rails, just enter that command again, and your system will be updated. In fact, if you’re running the above command on Mac OS X 10.5, that’s exactly what you’ll be doing: upgrading your existing Rails installation.
The last thing we need to do is install the storage container that’s going to house the data we (or our users) enter through our application’s web interface, the SQLite database engine.
It’s a fairly small library, so the installation shouldn’t take long: With Readline in place, we’re now able to install Ruby itself.
Don’t underestimate the importance of the work you’ve already done, though.
If your Mac is a relatively recent purchase, you may be running OS X version 10.5 (Leopard) or later.