I forgot to come back and let everyone off the hook.
Your .pro files didn’t build due to the missing -dev package. I downloaded my own separate Qt and got some old stuff ported to Qt 5 and deployed on the device, so I knew my environment worked fine. Your .pro files still failed with random missing includes though. I pulled my hair out for a long time. I’ve been a Qt guy for 13 years, and this is baby stuff, right? It should be!
So I obviously found and installed the missing headers getting my own environment up, but what I never did was try building with your environment after I had supplied the missing headers. You know, the environment that actually has the V-Play libraries? Yeah. That one. Moron.
I made it past all that a long time ago, and then the phone rang, and I’ve been on a wild ride for the past few days. I’ll get this looked at soon.