For reference, the officially supported operating systems for Qt4.8 (the last version of Qt4) are Ubuntu 10 32-bit, Ubuntu 11 64-bit, Windows XP SP3, Windows 7 32-bit, and Mac OS X 10.6 and 10.7.psi29a wrote:we should probably abandon Qt4 in our code anyway to move on to Qt5 unless someone has a good reason not too.
Qt5 seems to be working on a large number of developer systems, and the Mac setup instructions say to use Qt5.5.1 or higher anyway because Qt4 can't run on macOS 10.11+ (10.13 is the latest).
As best I can tell, the only reason we're still on Qt4 is because of this line in OpenMW-CS. Basically, we wanted to use multithreading at one point, but had to revert to single-threading instead. But I'm not aware of anybody complaining that single-threading has actually been a problem. I think the intention was that scrawl would eventually fix this, but now that he's left, I don't think that's going to happen.
Given that Qt4 is not supported on recent versions of macOS and will be removed from the next version of Debian, and the only issue doesn't appear to be bothering anybody running Qt5, are we prepared to drop Qt4 support?