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// install composer on Mavericks
curl -sS https://getcomposer.org/installer | php
sudo mv composer.phar /usr/bin/composer
composer

// upgrade php on mac os x
curl -s http://php-osx.liip.ch/install.sh | bash -s 7.0
sudo mv /usr/bin/php /usr/bin/php5424
sudo ln -s /usr/local/php5/bin/php /usr/bin/php