title: ERROR: Error installing mysql2: ERROR: Failed to build gem native extension
body: <p>I am having some problems when trying to install gem install mysql2 -v '0.3.17' for Rails. When I try to install it by running gem install mysql2 -v '0.3.17' or gem install mysql2 -v '0.3.17' it gives me the following error:</p>
  
  <pre><code>ERROR:  Error installing mysql2:
      ERROR: Failed to build gem native extension.
  
  
  Could not create Makefile due to some reason, probably lack of
  necessary libraries and/or headers.  Check the file for more
  details.  You may need configuration options.
  
  Provided configuration options:
      --with-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
      --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-mysql-config
      --without-mysql-config
  
  Gem files will remain installed in `..../gems/ruby-1.9.3-p392/gems/mysql2-0.3.17 for inspection`.
  Results logged to `.../gems/ruby-1.9.3-p392/extensions/x86_64-darwin-14/1.9.1/mysql2-0.3.17/gem_make.out`
  </code></pre>
  
  <p>How can I fix this and successfully install mysql2?</p>
  
  <p>Thanks all .</p>