On a newly installed Lenny server with Ruby1.8.7 and Rubygems installed
from source (not package) and latest rails installed through rubygems
$ sudo gem1.8 install thin
Building native extensions. This could take a while...
ERROR: Error installing thin:
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
/usr/lib/ruby/gems/1.8/gems/eventmachine-0.12.8 for inspection.
Results logged to
What dependency did I miss?