Re: Some Answers...
Any idea if modern Qt libraries work with it? With DB Browser for SQLite, the main the patch set needed for OS/2 compatibility was mostly to get things working with Qt 4.6.<something>. That was because Qt 4.6.<something> was the latest working version of the Qt libraries.
There were later releases of Qt (4.7/5.x), they just didn't work on OS/2 at the time (a few months ago).
I can dig up the specific's if that's useful... ;)