Bad gemspec for rspec-core

I receive this message when bundling using this example project:

The included Gemfile references HEAD of rspec-core, and the gemspec
there has this issue:

Using rspec-core (2.0.0.beta.19) from
(at master)
rspec-core at /Users/francois/.rvm/gems/ruby-1.9.2-rc2/bundler/gems/
rspec-core-3eb4494 did not have a valid gemspec.
This prevents bundler from installing bins or native extensions, but
that may not affect its functionality.
The validation message from Rubygems was:
[“lib/rspec/core/kernel_extensions.rb”, “lib/rspec/core/
object_extensions.rb”] are not files

I only had to refresh the gemspec in the rspec-core repository to fix
this, which I’ve done here: