Installing from source - `range_requirement?': undefined method `match'

[snowch]

When installing from source (as per the documentation here: https://forge.puppetlabs.com/puppetlabs/openstack), I am running into the error below.

I'm not sure if this is a bug against this project, or the librarian-puppet project.

+ cd /etc/puppet/modules
+ git clone git://github.com/stackforge/puppet-openstack.git openstack
Initialized empty Git repository in /etc/puppet/modules/openstack/.git/
remote: Reusing existing pack: 3200, done.
remote: Total 3200 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (3200/3200), 845.74 KiB | 322 KiB/s, done.
Resolving deltas: 100% (1641/1641), done.
+ cd openstack
+ gem install librarian-puppet
Successfully installed thor-0.18.1
Successfully installed librarian-puppet-0.9.10
2 gems installed
Installing ri documentation for thor-0.18.1...
Installing ri documentation for librarian-puppet-0.9.10...
Installing RDoc documentation for thor-0.18.1...
Installing RDoc documentation for librarian-puppet-0.9.10...
+ librarian-puppet install --path ../
/usr/lib/ruby/gems/1.8/gems/librarian-puppet-0.9.10/lib/librarian/puppet/requirement.rb:23:in `range_requirement?': undefined method `match' for nil:NilClass (NoMethodError)
        from /usr/lib/ruby/gems/1.8/gems/librarian-puppet-0.9.10/lib/librarian/puppet/requirement.rb:11:in `gem_requirement'
        from /usr/lib/ruby/gems/1.8/gems/librarian-puppet-0.9.10/lib/librarian/puppet/source/git.rb:103:in `fetch_dependencies'
        from /usr/lib/ruby/site_ruby/1.8/puppet/module_tool/modulefile.rb:15:in `map'