Hpricot をインストールしようとしてエラー - snbhsmt_log環境： CentOS 5.3 / Ruby 1.8.5 (RPM) # gem install hpricot Building native extensions. This could take a while... ERROR: Error installing hpricot: ERROR: Failed to build gem native extension. /usr/bin/ruby extconf.rb install hpricot can't find header files for ruby. Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/hpricot-0.8.1 for inspection. Results logged to /usr/lib/ruby/gems/1.8/ge
