Getting an error when trying to install the gem devise, the installation is stopping on the gem bcrypt-ruby: 

$ gem install bcrypt-ruby
Error installing bcrypt-ruby:
ERROR: Failed to build gem native extension.

I'm running OSX 10.6.7 with Ruby under RVM. I reinstalled the lastest version of xcode & reinstalled Ruby 64bit, Rails and all the gems.

ruby-on-rails ruby rubygems devise bcrypt
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