That would be a bit inaccurate though - the core library doesn't have a backend. The example you found e.g. implements an OpenGL backend. It doesn't reference

That would be a bit inaccurate though - the core library doesn't have a backend. The example you found e.g. implements an OpenGL backend. It doesn't reference any external libraries (maybe C runtime). IIRC it does not assume you have a malloc() function by default; you provide one or use a #define before include to tell the header it can rely on standard malloc.