ejholmes/vagrant-heroku — pull request #7 by ceaser (2012-08-25 10:13:00+00:00)
Title: Changing the OS Type to Ubuntu_64

Fixing a error that occurs with the original Mac Pro. After booting I would always receive the following error.

kernel requires an x86_64 cpu, but only detected an i686 cpu
unable to boot - please use a kernel appropriate for your cpu

Changing the OS Type ID fixed the issue.