The code doesn't seem to be tested on macOS. To make the example build I had to add an "#include <cmath>" at the top of both implot3d.cpp and implot3d_demo.cpp, this produces an executable which then fails with:
GLFW Error 65543: NSGL: The targeted version of macOS only supports forward-compatible core profile contexts for OpenGL 3.2 and above
...which is fixed by changing the GLFW window hints like this:
Edit: https://github.com/brenocq/implot3d/pull/7
PS: it looks like the code was tested only on Linux, since the Windows build seems to suffer from the same `std::` prefix problem: https://github.com/floooh/implot3d/actions/runs/12393862255