If you want to try it on Linux, without building the engine yourself, you'll need to run "apt install libxcursor-dev libxinerama-dev libx11-dev" as I described here: https://github.com/FlaxEngine/FlaxDocs/pull/85
And also follow this guide: https://docs.flaxengine.com/manual/scripting/cpp/index.html
And as a workaround for getting VSCode/VSCodium to work correctly is to fix these includes as described here: https://github.com/FlaxEngine/FlaxEngine/issues/666 (add "/usr/" etc.)