I don’t know what you guys are all talking about. I built an ARKit project from preview 4 on Windows 10 no problem, no remote-build required.
afaik, the engine comes pre-compiled with ARKit enabled by default. As long as you don’t need to enable/disable any plugins, you shouldn’t need to recompile the engine. If you do (which you should, as there are a ton of android plugins enabled by default aswell), Xcode will be required. This is when you’d need to either work directly on a Mac or use remote build.