If you worked with a system Ruby before switching to RVM, this system Ruby will be in your way when you switch between projects with/without RVM.

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It's hard to get rid of your system Ruby entirely, but you can tell RVM to just use a given Ruby by default, e.g.:

rvm --default use 1.8.7

You need to re-open existing terminals for the changes to take effect.

Note that this will not actually remove the ruby package from your system, it just isn't used anymore.