Update version in lib/syntax/version.rb.

Use Ruby ruby-1.9.3-p0 and RubyGems 1.8.30.

rvm install ruby-1.9.3-p0
rvm install rubygems 1.8.30 --force

Install dependencies.

gem install bundler
gem install RedCloth
gem install rake

Build the gem, use Ruby 1.9.3-p383, anything newer won’t work.

rake clean
rake package
gem push pkg/syntax-x.y.z.gem
git tag -v...
git push --tags