When rake goes to parse lib/tasks/rspec.rake (in 1.3.2):
WARNING: Global access to Rake DSL methods is deprecated. Please Include Rake::DSL into classes and modules which use the Rake DSL methods.
WARNING: DSL method Spec::Rake::SpecTask#task called at lib/tasks/rspec.rake:28:in `initialize'
"include Rake::DSL" gets confused and looks in the Spec namespace's Rake, which doesn't have DSL, so you have to ::Rake...
This has been fixed :-)
Fixed by #11.