I know this opinion may be unpopular, but: people have been successfully writing xlib apps for literally decades. There's no reason to use xcb for that type of

I know this opinion may be unpopular, but: people have been successfully writing xlib apps for literally decades. There's no reason to use xcb for that type of app, especially if you're just trying to get a GL window on the screen and you don't expect to be doing lots of tricky X calls.