title: Unable to install MySQL2 gem on Windows 7
body: <p>I am getting the following error message while installing, let me know if I need to post more details. </p>
  
  <p>I followed instructions from the following location: 
  <a href="https://github.com/oneclick/rubyinstaller/wiki/Development-Kit" rel="nofollow noreferrer">https://github.com/oneclick/rubyinstaller/wiki/Development-Kit</a></p>
  
  <p>I am using ruby 1.9.2p136 (2010-12-25) [i386-mingw32].</p>
  
  <p>Here is what I get:</p>
  
  <pre><code>E:\work_desk\trunk&gt;gem install mysql2 -v 0.2.4
  Temporarily enhancing PATH to include DevKit...
  Building native extensions.  This could take a while...
  ERROR:  Error installing mysql2:
          ERROR: Failed to build gem native extension.
  
  C:/Ruby192/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.
  
  Provided configuration options:
          --with-opt-dir
          --without-opt-dir
          --with-opt-include
          --without-opt-include=${opt-dir}/include
          --with-opt-lib
          --without-opt-lib=${opt-dir}/lib
          --with-make-prog
          --without-make-prog
          --srcdir=.
          --curdir
          --ruby=C:/Ruby192/bin/ruby
          --with-mysql-dir
          --without-mysql-dir
          --with-mysql-include
          --without-mysql-include=${mysql-dir}/include
          --with-mysql-lib
          --without-mysql-lib=${mysql-dir}/lib
          --with-libmysqllib
          --without-libmysqllib
  
  
  Gem files will remain installed in C:/Ruby192/lib/ruby/gems/1.9.1/gems/mysql2-0.
  2.4 for inspection.
  Results logged to C:/Ruby192/lib/ruby/gems/1.9.1/gems/mysql2-0.2.4/ext/mysql2/ge
  m_make.out
  </code></pre>