title: Convert WordPress to Jekyll has a error of Ruby MySQL
body: <pre class="lang-none prettyprint-override"><code>➜ henryyan@hy-hp  ~/work/blog/henryyan.github.com git:(master) ✗ ruby -rubygems -e 'require "jekyll/migrators/wordpress"; Jekyll::WordPress.process("wordpress", "root", "root")'
  &lt;internal:lib/rubygems/custom_require&gt;:29:in `require': LoadError: no such file to load -- mysql (Sequel::AdapterNotFound)
      from &lt;internal:lib/rubygems/custom_require&gt;:29:in `require'
      from /var/lib/gems/1.9.1/gems/sequel-3.33.0/lib/sequel/adapters/mysql.rb:4:in `rescue in &lt;top (required)&gt;'
      from /var/lib/gems/1.9.1/gems/sequel-3.33.0/lib/sequel/adapters/mysql.rb:1:in `&lt;top (required)&gt;'
      from &lt;internal:lib/rubygems/custom_require&gt;:29:in `require'
      from &lt;internal:lib/rubygems/custom_require&gt;:29:in `require'
      from /var/lib/gems/1.9.1/gems/sequel-3.33.0/lib/sequel/core.rb:312:in `block in tsk_require'
      from /var/lib/gems/1.9.1/gems/sequel-3.33.0/lib/sequel/core.rb:94:in `block in check_requiring_thread'
      from &lt;internal:prelude&gt;:10:in `synchronize'
      from /var/lib/gems/1.9.1/gems/sequel-3.33.0/lib/sequel/core.rb:91:in `check_requiring_thread'
      from /var/lib/gems/1.9.1/gems/sequel-3.33.0/lib/sequel/core.rb:312:in `tsk_require'
      from /var/lib/gems/1.9.1/gems/sequel-3.33.0/lib/sequel/database/connecting.rb:25:in `adapter_class'
      from /var/lib/gems/1.9.1/gems/sequel-3.33.0/lib/sequel/database/connecting.rb:63:in `connect'
      from /var/lib/gems/1.9.1/gems/sequel-3.33.0/lib/sequel/core.rb:141:in `connect'
      from /var/lib/gems/1.9.1/gems/sequel-3.33.0/lib/sequel/core.rb:345:in `adapter_method'
      from /var/lib/gems/1.9.1/gems/sequel-3.33.0/lib/sequel/core.rb:352:in `mysql'
      from /var/lib/gems/1.9.1/gems/jekyll-0.11.2/lib/jekyll/migrators/wordpress.rb:15:in `process'
      from -e:1:in `&lt;main&gt;'
  </code></pre>