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    <blockquote> <p>This answer was edited multiple times and now contains several <em>alternative</em> solutions. Try the simple “Edit 3” solution first.</p> </blockquote> <p><a href="http://www.ruby-lang.org/en/news/2012/02/16/ruby-1-9-3-p125-is-released/" rel="noreferrer">Ruby 1.9.3-p125 and later have official support for clang</a>, so if you are installing such a version you should not need GCC. If you’re installing an older version of Ruby, read on.</p> <p>To compile Ruby with GCC, you need a non-LLVM version of GCC, which is no longer included with XCode 4.2. Install it yourself (or downgrade to XCode 4.1 temporarily), then do <code>CC=/usr/local/bin/gcc-4.2 rvm install 1.9.3 --enable-shared</code> (substituting the path to your non-LLVM gcc).</p> <p>Edit: <a href="https://github.com/kennethreitz/osx-gcc-installer/downloads" rel="noreferrer">https://github.com/kennethreitz/osx-gcc-installer/downloads</a> may help for installing GCC. There is also some info available by running <code>rvm requirements</code>.</p> <p>Edit 2: For an easier solution, you can try adding <code>--with-gcc=clang</code> to the arguments to <code>configure</code> for Ruby to use clang instead of GCC.</p> <p><strong>Edit 3</strong>: <code>rvm install 1.9.3 --with-gcc=clang</code> does that for you.</p> <p>Note: With current versions of XCode you need to install the command-line tools separately from the XCode menu -> Preferences -> Downloads -> Components. This is a pre-requisite for doing any compiling with XCode on the command-line, not just Ruby.</p> <p>Note 2: If something doesn't work after following the steps, try doing a reboot or re-login to ensure that the environment gets set correctly.</p> <p>Note 3: Ruby versions prior to 1.9.3-p125 may not always be fully compatible with clang, so test your software thoroughly if using the “edit 3” solution in a production environment.</p>
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    1. COThe GCC-10.7.pkg didn't do it for me – I think it may only work on 10.7.0 (I'm running 10.7.2), but perhaps the v2 pkg works. Anyway, --with-gcc=clang did it for me! Thanks!
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    2. COThank you, this was a real time saver for me.
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    3. COThanks, Edit 3 fixed it for me too.
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