I recently encountered error while bundle install. The issue was with debugger gem. Following is the error I was getting
No source for ruby-1.9.3-p484 provided with debugger-ruby_core_source gem. extconf.rb failed
After searching Google for answer, I found that this gem depends upon another one named "debugger-ruby_core_source" as specified in error. So to successfully install debugger, you need to first install debugger-ruby_core_source by running following command
gem install debugger-ruby_core_source
Now install debugger using
gem install debugger
and hopefully every thing will work out smoothly now.