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copied!<p>For anyone encountering this issue on Mac OSX 10.8 Mountain Lion when attempting to upgrade their <strong>Gemfile</strong> with <code>gem 'therubyracer', '0.11.0'</code>, just upgrading the system <code>libv8</code> gem worked for me (no uninstallation of any other gem necessary):</p> <pre><code>$ gem update libv8 $ bundle install </code></pre> <h3>Edit</h3> <p>If you use <a href="https://travis-ci.org/" rel="nofollow noreferrer">Travis-CI</a> (or other CI tools located on other servers, I assume), you will need to explicitly add the <code>libv8</code> gem to your <strong>Gemfile</strong> as well:</p> <p><strong>Gemfile</strong></p> <pre><code>gem 'libv8', '3.11.8.3' </code></pre> <p>then <code>bundle install</code> as usual. Just note that <code>libv8</code> can take a significant amount of time to install and I've noticed that it may end up being the cause of going over <a href="http://about.travis-ci.org/docs/user/build-configuration/#Build-Timeouts" rel="nofollow noreferrer">Travis CI's timeout limits</a>, causing your build to fail. You can mitigate this slightly be not including development environment gems in your builds:</p> <p><strong>.travis.yml</strong></p> <pre><code># ... bundler_args: --binstubs=./bundler_stubs --without development </code></pre> <h3>Update</h3> <p>Yep, pretty much all my Travis builds timeout and fail because of this. If anyone knows a way to solve this problem (I would hope "downgrade <code>therubyracer</code>" is a last resort), please leave a comment!</p> <h3>Update 2</h3> <p>This may not work for all apps, but it seems that my Rails 3.2.9 apps didn't actually need <code>therubyracer</code> or <code>libv8</code> after all. After removing those gems from my <strong>Gemfile</strong>, I confirmed that my specs passed, pushed again to Travis and it built successfully. So, I guess getting rid of those gems (if you're not sure you actually need them) is at least worth a try.</p> <h3>Update 3</h3> <p>Thanks to <a href="https://stackoverflow.com/users/430695/paul-annesley">Paul Annesley</a> for confirming that if you're on Mac OS X 10.8 Mountain Lion, you don't need <code>therubyracer</code> gem at all since the OS already comes bundled with Apple JavaScriptCore, its own Javascript runner. At the time of the original answer, I was on Snow Leopard and hence needed it.</p>

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