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net-dns2 includes a couple extra libraries, one of which (pcaprub) fails to compile on Heroku (see below). This fix switches back to net-dns and also switches from flexmock to rspec-mocks, because flexmock had issues with net-dns.
This pull requests builds on rack-middleware, but the last commit could be extracted minus the middleware spec.
net-dns2 heroku deploy pcaprub stacktrace: