slave:~# gem install god Bulk updating Gem source index for: http://gems.rubyforge.org/ Building native extensions. This could take a while… ERROR: Error installing god: ERROR: Failed to build gem native extension./usr/bin/ruby1.8 extconf.rb install god extconf.rb:1:in `require’: no such file to load – mkmf (LoadError) from extconf.rb:1

Gem files will remain installed in /var/lib/gems/1.8/gems/god-0.7.8 for inspection. Results logged to /var/lib/gems/1.8/gems/god-0.7.8/ext/god/gem_make.out

Solution: Install dev libraries.

slave:~# sudo apt-get install ruby1.8-dev linux-libc-dev libc6-dev