git clone https://github.com/twitter-forks/rails.git
cd rails
git checkout patch_for_CVE-2013-6415_and_CVE-2013-6417
git format-patch origin/2-3-stable --stdout > patch_for_CVE-2013-6415_and_CVE-2013-6417.patch

git clone https://github.com/twitter-forks/rails.git
cd rails
git checkout patch_for_CVE-2013-6415_and_CVE-2013-6417
PKG_BUILD=1 rake gem
mkdir rails-2.3.18.1
find . -name *2.3.18.1.gem | xargs -J % mv % rails-2.3.18.1/
cd rails-2.3.18.1
gem install *.gem