I really need to modify some things in the engine to make it work better on MacOS, so I would really appreciate it if someone could tell me what I did wrong.
Judging from the error message and a five minute research, it would seem make update downloaded dependencies to the wrong path or wrong dependencies altogether.
If that’s what happened, you have to download them again manually. Thrilling, eh? ;>
Note: there’s an UPBGE-specific version of the build steps for Mac here, but it looks very much identical to the one on Blender’s site so I don’t think that’s the issue.