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// Clone L4 repo
git clone -b develop git://github.com/laravel/laravel.git myapp
cd myapp

// Install Composer
curl -sS https://getcomposer.org/installer | php
php composer.phar install

// Rename origin
git remote rename origin upstream

// Add your own repo as Origin
git remote add origin git@github.com/niallobrien/myapp.git
git push -u origin develop

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// Update L4 app
git fetch upstream
git merge upstream/develop

// Update Composer packages
php composer.phar update

git push # would go to your fork