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Since it took me quite some time to resolve this problem, I hope this post will be useful for someone else. I am using the CAPTCHA gem in my application and always got the following error: undefined method `stringFT'' for GD::Image:Class It turns out that I was missing the GD libs for ruby. I''m on ubuntu, so a quick sudo install libgd-ruby solved the problem for me. I also found resources for OS X and Red Hat Enterprise Linux 4: OS X: http://lukewarmtapioca.com/2007/02/06/gd-on-osx-and-ruby...