Use v2.0.4 of the dmg cookbook.

https://github.com/opscode-cookbooks/dmg/commit/19fb6d54919cde71eae37658493526c87d8ac5f0#diff-2e28e2e462a229f132a115f3fe23a415R21
causes a SyntaxError exception to be thrown in Chef 10.14.2.
Install ØMQ version 3.2.4.