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Vine 3.2 に sqlite3-ruby を RubyGem からインストール

$ sudo apt-get install sqlite3
$ sudo gem install sqlite3-ruby
Attempting local installation of 'sqlite3-ruby'
Local gem file not found: sqlite3-ruby*.gem
Attempting remote installation of 'sqlite3-ruby'
Select which gem to install for your platform (i386-linux)
 1. sqlite3-ruby 1.1.0 (mswin32)
 2. sqlite3-ruby 1.1.0 (ruby)
 3. sqlite3-ruby 1.0.1 (ruby)
 4. sqlite3-ruby 1.0.1 (mswin32)
 5. sqlite3-ruby 1.0.0 (mswin32)
 6. sqlite3-ruby 1.0.0 (ruby)
 7. sqlite3-ruby 0.9.0 (ruby)
 8. sqlite3-ruby 0.9.0 (mswin32)
 9. sqlite3-ruby 0.6.0 (ruby)
 10. sqlite3-ruby 0.5.0 (ruby)
 11. Cancel installation
> 2
Building native extensions.  This could take a while...
can't find header files for ruby.
ERROR:  While executing gem ... (RuntimeError)
    ERROR: Failed to build gem native extension.
Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.1.0 for inspection.
  ruby extconf.rb install sqlite3-ruby\n

Results logged to /usr/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.1.0/ext/sqlite3_api/gem_make.out
$ cat /usr/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.1.0/ext/sqlite3_api/gem_make.out 
ruby extconf.rb install sqlite3-ruby

さて、どうしたもんだろう。 "can't find header files" っていっても具体的にどれよ?
→ 解決! どうやら、 ruby-devel が入っていなかったのが原因だったようだ。

$ sudo apt-get install ruby-devel
$ sudo gem install sqlite3-ruby

参考: の "Possible Gotchas", "Q: I get errors when trying to install the gem ..." の項。 ruby.h が必要らしい、ということは、ここを見て初めて分かった。