Poltergeistのインストール方法

ブラウザタイプのクローラーに必要だった為gemのPoltergeistをインストールしました。

[user@localhost crawler]$ gem install poltergeist 
Fetching: mime-types-data-3.2016.0521.gem (100%) 
Successfully installed mime-types-data-3.2016.0521 
Fetching: mime-types-3.1.gem (100%) 
Successfully installed mime-types-3.1 
Fetching: rack-2.0.1.gem (100%) 
Successfully installed rack-2.0.1 
Fetching: rack-test-0.6.3.gem (100%) 
Successfully installed rack-test-0.6.3 
Fetching: xpath-2.0.0.gem (100%) 
Successfully installed xpath-2.0.0 
Fetching: public_suffix-2.0.4.gem (100%) 
Successfully installed public_suffix-2.0.4 
Fetching: addressable-2.5.0.gem (100%) 
Successfully installed addressable-2.5.0 
Fetching: capybara-2.11.0.gem (100%) 
Successfully installed capybara-2.11.0 
Fetching: websocket-extensions-0.1.2.gem (100%) 
Successfully installed websocket-extensions-0.1.2 
Fetching: websocket-driver-0.6.4.gem (100%) 
Building native extensions. This could take a while... 
Successfully installed websocket-driver-0.6.4 
Fetching: cliver-0.3.2.gem (100%) 
Successfully installed cliver-0.3.2 
Fetching: poltergeist-1.12.0.gem (100%) 
Successfully installed poltergeist-1.12.0 
Parsing documentation for mime-types-data-3.2016.0521 
Installing ri documentation for mime-types-data-3.2016.0521 
Parsing documentation for mime-types-3.1 
Installing ri documentation for mime-types-3.1 
Parsing documentation for rack-2.0.1 
Installing ri documentation for rack-2.0.1 
Parsing documentation for rack-test-0.6.3 
Installing ri documentation for rack-test-0.6.3 
Parsing documentation for xpath-2.0.0 
Installing ri documentation for xpath-2.0.0 
Parsing documentation for public_suffix-2.0.4 
Installing ri documentation for public_suffix-2.0.4 
Parsing documentation for addressable-2.5.0 
Installing ri documentation for addressable-2.5.0 
Parsing documentation for capybara-2.11.0 
Installing ri documentation for capybara-2.11.0 
Parsing documentation for websocket-extensions-0.1.2 
Installing ri documentation for websocket-extensions-0.1.2 
Parsing documentation for websocket-driver-0.6.4 
Installing ri documentation for websocket-driver-0.6.4 
Parsing documentation for cliver-0.3.2 
Installing ri documentation for cliver-0.3.2 
Parsing documentation for poltergeist-1.12.0 
Installing ri documentation for poltergeist-1.12.0 
Done installing documentation for mime-types-data, mime-types, rack, rack-test, xpath, public_suffix, addressable, capybara, websocket-extensions, websocket-driver, cliver, poltergeist after 7 seconds 
12 gems installed

特に問題なくインストール出来ました。

以下作業時に使用しています。

http://normalblog.net/system/mydev/crawler/