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First, use <code>rvm info</code> and make sure the values reported are sane and what you expect. As of this moment, RVM is at version 1.10.0. If <code>rvm -v</code> shows a lower version number, run <code>rvm get head;rvm reload</code> to update to the current version. That step alone can fix all sorts of issues. To switch from a RVM controlled Ruby back to the version installed in your Mac by Apple, use: <pre><code>rvm system </code></pre> That should allow you to do: <pre><code>which ruby </code></pre> and get: <pre><code>/usr/bin/ruby </code></pre> or: <pre><code>ruby -v </code></pre> and get something like: <pre><code>ruby 1.8.7 (2010-01-10 patchlevel 249) [universal-darwin10.0] </code></pre> To return to a RVM controlled Ruby, use: <code>rvm 1.9.2</code> or <code>rvm default</code> if you have set up a default Ruby. If you haven't set up a default Ruby, I recommend you do so, using: <code>rvm 1.9.2 --default</code>, substituting whatever version of Ruby you want as your default. You do NOT have to install a version of 1.8.7 under RVM's control if you don't want to, however, if you intend to modify the 1.8.7 owned by the system by adding or changing gems do so carefully. That version was installed for Apple's use and you are piggybacking on it and changes could affect the use of certain apps or future apps installed by Apple. If you need to add gems or tweak 1.8.7, I'd recommend using RVM's <code>rvm install 1.8.7</code> into your sandbox, and go from there. At that point you can eschew using the system version of Ruby 1.8.7, and leave it alone for Apple's apps. If all you want to do is install MacVIM, you can accomplish what you want, which is to tell the system that the RVM versions are NOT installed, by temporarily tweaking your PATH variable to NOT include the RVM controlled Rubies in your <code>~/.rvm</code> directory. You can do that by editing PATH, or by temporarily modifying your <code>~/.bash_profile</code> or <code>~/.bashrc</code>, whichever has the RVM initialization in it. Open a new shell, run your install steps, then revert the file. There are many ways to get where you want to go.
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1. POHow do I switch Ruby system back to 1.8.7 using RVM?
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