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copied!<p>Your "old" gems would be relative to the Ruby that came bundled with the Mac because the <code>gem</code> command is included with Ruby 1.8.7, which is stock on Snow Leopard. If your <code>which ruby</code> shows <code>/usr/bin/ruby</code>, your gem environments should be similar to:</p> <pre><code>- GEM PATHS: - /Library/Ruby/Gems/1.8 - /Users/greg/.gem/ruby/1.8 - /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8 </code></pre> <p>If you are using RVM you <em>might</em> be able to tell it to <a href="http://rvm.beginrescueend.com/gemsets/copying/" rel="noreferrer">copy your gems</a> from the <code>system</code> gemset to one under RVM's control. I haven't tried doing that as I install RVM immediately and let it handle all my Ruby installation and then I ignore the system's installation.</p> <p>If your <code>which ruby</code> shows <code>/usr/local/bin/ruby</code> then the <code>gem env</code> command should reflect the changed path for the version you compiled from source.</p> <p>I'm curious <em>WHY</em> you would build it manually, when <a href="http://rvm.beginrescueend.com/" rel="noreferrer"><code>RVM</code></a> is available to handle all the <a href="http://rvm.beginrescueend.com/rvm/install/" rel="noreferrer">configuration and installation</a>, and largely remove any concerns about <em>where</em> things are and whether you've just stomped on the system's installed version.</p> <p>When RVM has installed a Ruby version, it will all be in <code>~/.rvm</code> and your Gems will be nicely located there too. You'll be able to <a href="http://rvm.beginrescueend.com/rubies/rubygems/" rel="noreferrer">manage the gems</a> as <a href="http://rvm.beginrescueend.com/gemsets/" rel="noreferrer">gemsets</a>, relative to each version of Ruby, and switch back and forth instantly. Or, even better, you can run a command/program in each version of Ruby you have installed to test them using <a href="http://rvm.beginrescueend.com/set/ruby/" rel="noreferrer"><code>rvm ruby 'some command'</code></a>.</p> <p>Notice in the above <code>gem env</code> output that gems are in three separate areas on the disk. Under RVM's control they're in RVM's sandbox:</p> <pre><code>- GEM PATHS: - /Users/greg/.rvm/gems/ruby-1.9.2-p0 - /Users/greg/.rvm/gems/ruby-1.9.2-p0@global </code></pre> <p>That makes it trivial for me to back them up, or blow them away if I want to.</p> <p>I used to compile my rubies from source on my Macs and Linux boxes. I use RVM for that now. It's so much better than doing it by hand.</p>

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