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PDF-WriterをRubyGemsでインストールしてみる。
参考：http://jp.rubyist.net/magazine/?0010-PackageManagement
パッケージの検索

$ gem search --remote pdf-writer


    
REMOTE GEMS ***
    Updating Gem source index for: http://gems.rubyforge.org

pdf-writer (1.1.3, 1.1.2, 1.1.1, 1.1.0, 1.0.1, 1.0.0)
    A pure Ruby PDF document creation library.

パッケージのインストール
$ sudo gem install pdf-writer
Password:
Attempting local installation of 'pdf-writer'
 -> Local installation can't proceed due to LoadError: Could not find RubyGem color-tools (~> 1.3)
Attempting remote installation of 'pdf-writer'
Updating Gem source index for: http://gems.rubyforge.org
Install required dependency color-tools? [Yn]  y
Install required dependency transaction-simple? [Yn]  y
Successfully installed pdf-writer-1.1.3
Successfully installed color-tools-1.3.0
Successfully installed transaction-simple-1.3.0
Installing RDoc documentation for pdf-writer-1.1.3...
Installing RDoc documentation for color-tools-1.3.0...
Installing RDoc documentation for transaction-simple-1.3.0...
RubyGemsでインストールしたモジュールを使うにはまず
require "rubygems"
する必要がある。（他にも方法があるようだが）



    
Creating Printable Documents with Ruby
    http://www.artima.com/rubycs/articles/pdf_writer.html