くだらねえ質問はここに書き込め！ Part 184

くだらねえ質問はここ ..

15:login:Penguin
10/05/26 21:38:42 fL14CTDo
$ sudo gem install eventmachine
Building native extensions. This could take a while...
ERROR: Error installing eventmachine:
ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb
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/eventmachine-0.12.10 for inspection.
Results logged to /var/lib/gems/1.8/gems/eventmachine-0.12.10/ext/gem_make.out

eventmachineをインストールしようとしたらこんなエラーが出たのですが、どうしたらよいでしょうか？

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