Update: the gem seems to be up on RubyForge now, so just
packr and you’re all set.
At the request of Aman Gupta (again!) PackR is now available as a gem. I’ve not got myself all set up on RubyForge yet, but in the meantime you can download the gem from my subversion repository. Just save that to disk, then:
gem install packr-1.0.0.gem