the make deploy-dcos command calls on both Terraform and Ansible to deploy a stack of resources on AWS and then install DC/OS in strict mode.
Those are not included with this repository as they're forks of great work by two colleagues which can be found here:
If you need to build a DC/OS environment for testing, I recommend checking out the new DC/OS labs repository which combines both Terraform and Ansible in one and covers AWS, GCP and on-prem.