I installed it on my system the following way:

sudo zypper ar -r http://download.opensuse.org/repositories/devel:/languages:/ruby:/extensions/openSUSE_Factory/devel:languages:ruby:extensions.repo
sudo zypper in rubygem-actionmailer rubygem-actionpack rubygem-activerecord rubygem-activeresource rubygem-activesupport rubygem-rails
sudo zypper in rubygem-sqlite3 rubygem-gettext_rails rubygem-libxml-ruby rubygem-delayed_job

cat > config/database.yml <<EOF
development:
  adapter: sqlite3
  database: db/development.sqlite3
  pool: 5
  timeout: 5000
EOF

rake db:migrate

./script/server