[Ruby] gems: nokogiri をインストールする

memo.

[markdown]
こちらを参考にさせて頂きました。

> * [OSX – Mac OS X Mavericksで”gem i nokogiri”失敗の解決方法 – Qiita](http://qiita.com/t_732_twit/items/a7956a170b1694f7ffc2)

必須ライブラリを brew でインストールします。

“`prettyprinted
% brew doctor
% brew update
% brew upgrade
% brew tap homebrew/dupes
% brew install libxml2 libxslt libiconv
“`

nokogiri をインストールします。

“`prettyprinted
% gem install nokogiri — –use-system-libraries –with-iconv-dir=”$(brew –prefix libiconv)” –with-xml2-config=”$(brew –prefix libxml2)/bin/xml2-config” –with-xslt-config=”$(brew –prefix libxslt)/bin/xslt-config”
Building native extensions with: ‘–use-system-libraries –with-iconv-dir=/usr/local/opt/libiconv –with-xml2-config=/usr/local/opt/libxml2/bin/xml2-config –with-xslt-config=/usr/local/opt/libxslt/bin/xslt-config’
This could take a while…
Successfully installed nokogiri-1.6.6.2
1 gem installed
“`

バージョンを確認。

“`prettyprinted
% nokogiri -v
# Nokogiri (1.6.6.2)
—
warnings: []
nokogiri: 1.6.6.2
ruby:
version: 2.2.3
platform: x86_64-darwin14
description: ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin14]
engine: ruby
libxml:
binding: extension
source: system
compiled: 2.9.0
loaded: 2.9.0
“`
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