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ubuntuでのmongrelのインストールトラブル

Ubuntu 6.10 “Edgy Eft” でmongrelを入れる際、

Select which gem to install for your platform (i486-linux)
1. fastthread 1.0 (ruby)
2. fastthread 1.0 (mswin32)
3. fastthread 0.6.4.1 (mswin32)
4. fastthread 0.6.4.1 (ruby)
5. Skip this gem
6. Cancel installation
> 1
Building native extensions.  This could take a while...
ERROR:  While executing gem ... (Gem::Installer::ExtensionBuildError)
ERROR: Failed to build gem native extension.
ruby extconf.rb install mongrel
creating Makefile
make
gcc -fPIC -Wall -g -fno-strict-aliasing -O2  -fPIC  -I.
-I/usr/lib/ruby/1.8/i486-linux -I/usr/lib/ruby/1.8/i486-linux -I.   -c fastthread.c
In file included from fastthread.c:12:
/usr/lib/ruby/1.8/i486-linux/ruby.h:28:21: error: stdlib.h: No such file or directory
Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/fastthread-1.0
for inspection.
Results logged to /usr/lib/ruby/gems/1.8/gems/fastthread-1.0/
ext/fastthread/gem_make.out

こんなエラーにあいました。
理由は、build-essentialをインストールしてなかったからなのでした。
すっかり忘れてました。
http://www.urbanpuddle.com
英語をどうにか読みながら、ようやく思い出しました。

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