git clone https://github.com/fd/opts.git ~/Github/fd/opts
cd ~/Github/fd/opts
gem build opts.gemspec
rvm gemset use global
gem install opts-0.0.1.gem
git clone https://github.com/fd/git_workflow.git ~/Github/fd/git_workflow
cd ~/Github/fd/git_workflow
gem build git_workflow.gemspec
(Check your RVM gemset if necessary) and install this gem
gem install git_workflow-0.0.1.gem