KartKrewDev/RingRacers — reverse-engineered prompt

Build me a free open source kart racing game in the spirit of old Sonic fan games, called Dr. Robotnik's Ring Racers. It should be a real playable game, not just a demo screen, with fast arcade kart racing, colorful retro style presentation, and a source code setup that other fans can build themselves.

Please make it in C or C++ with CMake, and set it up so it can build on Linux, Windows, and macOS with common compilers. Use sensible build presets for debug, development, and release, and handle third party dependencies cleanly, using vcpkg where that makes sense.

Include a clear README that explains what the game is, how to build it from source, and that it is free fan art with no affiliation to SEGA. Add license files and keep the project organized so people can contribute later. Look up current build docs online if you need to.