I have a headless Debian Buster server as well as my Windows box. Given your comment below, I thought I'd first try to build native Linux, but have already come to a hurdle! Not having used Qt either adds a bit more to the learning curve. But nothing is insurmountable, even for an old dog :)

~/src/subsurface/build$ ./subsurface
QOpenGLFunctions created with non-current context
ASSERT: "QOpenGLFunctions::isInitialized(d_ptr)" in file /usr/include/x86_64-linux-gnu/qt5/QtGui/qopenglfunctions.h, line 886
Aborted
~/src/subsurface/build$

So Subsurface can easily be BUILT on a headless Debian box - but then for running it, you need some way to display the screen, right? We do actually have a headless version that is intended to be used on Raspberry Pi or other small systems simply as a downloader, but that's likely not the direction you are looking for. So what you built above, is a native Linux app that will run on a Linux system that has an real (or virtual) display. Well, I don't know. The turnaround time is really painful. It might be more fun to build under Linux. Where / how are you running this headless Debian system? Is this a VM under HyperV? Or is there a way you could install a VM with a desktop Linux somewhere? That will really make the learning curve so much less steep...
I should have articulated more clearly .. it is a physical PC running Debian Buster that I use for a few services (mostly web based), and I usually just SSH into it for admin. I do have VcXsrv on my Windows box so when required can run X clients. I compiled subsurface, which appeared to complete with only a few type conversion warnings, but executing it from within an xterm gave me the OpenGL error. It may very well be an issue with VcXsrv not playing nice with OpenGL.

I could install a Fedora or Ubuntu desktop VM to eliminate VcXsrv as a culprit.

Mark.

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