fogleman/Craft ? reverse-engineered prompt

Build me a simple Minecraft style voxel game in C that runs on Windows, Mac, and Linux, with modern OpenGL rendering and shader based graphics. I want the world to generate nicely with hills, trees, grass, clouds, and a day night cycle, and I should be able to place and break blocks, switch between block types, fly around, and move with keyboard and mouse controls.

Please also make the world save changes locally so anything I build stays there when I come back, and add multiplayer so I can connect to a server, see other players, chat, and teleport around with a few simple commands. If you need to look up current docs online for CMake, OpenGL, or any dependencies, go ahead.

Keep it lightweight and practical, with a clean playable result first, then polish the visuals and persistence so it feels like a small but real Minecraft clone.