Rails - cannot run app: Unable to load the EventMachine C extension;

Question

When I run an app on Lion OS X, I get this error:

Unable to load the EventMachine C extension; To use the pure-ruby reactor, require \'em/pure_ruby\'
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Answer 1

The easiest fix as the message says is just to require 'em/pure_ruby'. I think you can put this in the config/inlitializers folder, you can call the file event_machine.rb

But it won't have the same performance as the C extension.