bundle install: Failed to build gem native extension
===

i have git clone git://github.com/jalagrange/excel_test_app.git
I got the below error while the bundle install, This does not happen with other my applications.

following error

    Installing mysql2 (0.3.6) with native extensions
    Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    C:/RailsInstaller/Ruby1.9.3/bin/ruby.exe extconf.rb
    checking for rb_thread_blocking_region()... yes
    checking for main() in -llibmysql... no
    *** extconf.rb failed ***
    Could not create Makefile due to some reason, probably lack of
    necessary libraries and/or headers. Check the mkmf.log file for more
    details. You may need configuration options.

gemfile

        source 'http://rubygems.org'
    
    gem 'rails', '3.1.0'
    
    # Bundle edge Rails instead:
    # gem 'rails',     :git => 'git://github.com/rails/rails.git'
    
    gem 'sqlite3'
    gem "spreadsheet"
    gem "carrierwave"
    gem "mini_magick"
    gem 'flash_cookie_session'
    gem "pry"
    gem "haml"
    gem 'fog'
    
    # To use Delayed_job
    gem 'daemons'
    gem 'delayed_job_active_record'
    
    # Gems used only for assets and not required
    # in production environments by default.
    group :assets do
      gem 'sass-rails', "  ~> 3.1.0"
      gem 'coffee-rails', "~> 3.1.0"
      gem 'uglifier'
    end
    
    gem 'jquery-rails'
    
    # Use unicorn as the web server
    # gem 'unicorn'
    
    # Deploy with Capistrano
    # gem 'capistrano'
    
    # To use debugger
    # gem 'ruby-debug19', :require => 'ruby-debug'
    
    group :test do
      # Pretty printed test output
      gem 'turn', :require => false
    end
    
    
    group :development, :test do
      gem "mysql2", "0.3.6"
      gem "letter_opener"
      gem "pry"
    end


this question and answer not working for my problem..
http://stackoverflow.com/questions/4304438/mysql-failed-to-build-gem-native-extension