Hello Rails, I have a problem.
I would like to use captcha in one of my project. When I did try to
install, this is what I got
$ sudo gem install captcha
Building native extensions. This could take a while…
ERROR: Error installing captcha:
ERROR: Failed to build gem native extension.
extconf.rb:1:in `require’: no such file to load – mkmf (LoadError)
Gem files will remain installed in /var/lib/gems/1.8/gems/
rmagick-2.12.2 for inspection.
Results logged to /var/lib/gems/1.8/gems/rmagick-2.12.2/ext/RMagick/
Could any one help me out on this?