[Rails] captcha issue

hi all,
   i have captcha image on Registration popup but on local the captcha image and code is not coming.
   i have install RMagick and gd2 gem also.It gives following error,

  MissingSourceFile (no such file to load -- GD):
  lib/captcha_image.rb:22
  app/controllers/login_controller.rb:385:in `sign_up'
  -e:2:in `load'
  -e:2

is anyone who used captcha on local machine ?

thanks in advanced.

--
Regards
Sachin S. Kewale

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