Use flags to make test suite on stackage easy to maintain
Created by: lwm
https://github.com/fpco/stackage/issues/3293#issuecomment-388232398
Tracking here since we'll be blocked on forth coming nightly builds.
Created by: lwm
https://github.com/fpco/stackage/issues/3293#issuecomment-388232398
Tracking here since we'll be blocked on forth coming nightly builds.