The following components are required to be installed through Visual Studio Installer:
Desktop development with C++
Visual C++ ATL for x86 and x64
Visual C++ MFC for x86 and x64
Copy GLAUX.h to your Windows SDK location, it is no longer included with modern SDK installs
Win 10 17763: C:\Program Files (x86)\Windows Kits\10\Include\10.0.17763.0\um\gl
Halo1 Xbox map editor
Made by Grenadiac
Apparently this is a Mac port https://github.com/ChadSki/Swordedit