@Barnak in case you didn't get it to compile, you can find a Universal QSS-M (has almost latest QS as part of fork) at https://qssm.quakeone.com 

What does the -M add to QSS? 

Multiplayer 

I tried your game app (QSS-M), and there's a strong mouse issue that makes QSS-M unusable:

The app works, graphics are all okay (AFAIK), but the mouse is way too slow. I adjusted the mouse sensibility to the max in QSS-M options, and the mouse motion is still too slow. But worst: when I quit the app, then my mouse sensibility is turned to the minimum value in the Mac OS. It's painful! I have to go to the OS settings to set back the mouse sensibility to what it was before. I have to redo the same operation each time I quit QSS-M. So there's definitively something wrong with QSS-M. 

Does it work properly in the latest QS? I'd like to see where the bug is, I do not see it on my end. 

Woods, the latest version of regular QS for OSX plays perfectly, there's no problem with the mouse motion and sensitivity. It's an Intel version, so it plays under Rosetta 2 on a Silicon Mac. I'm suprised that your version has an issue with the mouse. 

I am on a M2 MBP. What is your config setup? Mouse and Mac? 

32GB ram, Ventura 13.3.

BlueTooth Apple Magic Mouse, TouchID keyboard. 

just plugged in a logitech mouse, no issues :( wonder what could be causing this, I will investigate further

can you try a wired mouse or diff one? 

but what does QSS-M mean in terms of features? client-side input prediction? interpolation? lag compensation? 

This Google sheet outlines by colors the new features of M vs QSS and QSS vs QS and QS vs Fitzquake

https://docs.google.com/spreadsheets/d/1ubOuromaXpZonfL-eJ-KA7q-xSRiBBuSvxahzF-uFOY/edit#gid=0

Currently no movement prediction; no NetQuake MP still best played at 50 or less ping. 

Ah, I see. Several CPMA-like features! 

Slightly off-topic, if you are interested I would like to chat with you and see if you are interested in assisting me (or joining me) in some engine coding.

You and I have always had the same goals and I always admired your Mac OS mojo. And we could test each other's work.

Let me know. 

Baker that would be a privilege; it's nice to hear from you. I spent the last year or so (trying) to learn how to program with the QSS-M project. When I came back to Quake a few months into the pandemic I dove into all the projects and found so many of your amazing contributions and borrowed from many. 

Excellent! For the lack of a better plan, I'll send you my email address in a private message at quakeone.com in an hour or so. 

I tried with my old mouse (with a cable). It's the same issue. I suspect it's related to the Apple Studio display I use (it's a 5K display). The mouse is way too slow, even when I set its speed to max in QS-M. When I quit the game, my mouse is then reverted to a crawling speed. I need to set it back to my usual speed in the MacOS settings pane. So QS-M is unusable to me.

I also suspect some kind of interaction with the preferences of the regular QS (latest version available for Mac OS). It appears that when I change my prefs settings in QS-M, it may interfere with my settings in regular QS, but I'm not sure. 

I tried vkQuake, which is native on Silicon Macs (it's an universal binary). It works, except that ... sounds totally sucks and apparently there's no option to setup the sound system. Playing vkQuake give me the impression to have a strong hearing problem. WTF is that mono sound system?

Also, vkQuake doesn't give a command line window at the game launch, which sucks! QuakeSpasm is much better (and there's no sound problem with QS!).

The mouse feel is different in vkQuake. It's not as "sensible" as the mouse sensitivity in QS, but it's okay. I can set it to a relatively good feel. But strangely, it affects the mouse sensitivity in QS after I quit vkQuake and I have to set it back in QS! WTF!?

On a side note: vkQuake has a cool control feature that I would like to see in QS: a zoom view using the keyboard. I'm unaware if there's something similar in QS. 

With Windows, you can change the sound settings as for QuakeSpasm in vkQuake by adding :
vkquake.exe -sndspeed 44100

Else, sound sampling is 11025 Hz as for original Quake.

Maybe this works on Mac too? 

Macs applications can't do command line parameters.

Like how the Apple mouse that comes with your Mac has 1 button, so you put the Apple mouse in a drawer and plug in a real mouse with 5 mouse buttons and a scroll wheel. 

The regular QS on Mac has a command line option at start. vkQuake doesn't.

The Apple Magic mouse is a track pad on a curved surface. It has two buttons and a "scroll wheel". In Quake, I don't need to use these options. I use the mouse exactly like my old one-button mouse (with a cable) and it's enough for me in Quake1 (and even in Quake3). I do all the rest with my left hand on the keyboard.