How to make GUI for simple C++ game on linux

I have an idea to program a bot to play an alteration of the snake game. The only piece of knowledge that I'm missing to make this happen is how to bring this simulation to life with a GUI.

So in C++, what is the simplest ways to build a GUI?

Target platform is Linux.
You need to work with a GUI providing library. There are some which are available at linux: Qt, SFML, SDL, etc.
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