How do you connect MySQL to Ruby on Rails?

I followed this post, http://blog.teamtreehouse.com/installing-ruby-rails-and-mysql-on-os-x-lion.

I have been learning Ruby and Rails for a month, so I am quite familiar with Ruby. I also know some parts of Rails due to the understandings acquired by following several tutorials.

However, I continuously fail to 'gem install mysql' or 'gem install mysql2' prior to 'rails new photos -d mysql'.

I already successfully finished 'brew install mysql' and checked 'mysql -u root'.

seodongju@Seoui-MacBook-Pro ~/Desktop/Projects$ sudo gem install mysql2 Password: Building native extensions. This could take a while... ERROR: Error installing mysql2: ERROR: Failed to build gem native extension.

/usr/local/rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb

checking for rb_thread_blocking_region()... yes checking for rb_wait_for_single_fd()... yes checking for rb_hash_dup()... yes checking for rb_intern3()... yes checking for mysql.h... no

checking for mysql/mysql.h... no

mysql.h is missing. please check your installation of mysql and try again.

*** 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 --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=/usr/local/rvm/rubies/ruby-2.0.0-p247/bin/ruby --with-mysql-config --without-mysql-config

Gem files will remain installed in /usr/local/rvm/gems/ruby-2.0.0-p247/gems/mysql2-0.3.13 for inspection. Results logged to /usr/local/rvm/gems/ruby-2.0.0-p247/gems/mysql2-0.3.13/ext/mysql2/gem_make.out