How to prevent Fullscreen button on OS X Title Bar

gistfile1.txt

@import AppKit;
#include <SDL2/SDL.h>
#include <SDL2/SDL_syswm.h>

void update_SDL_Window_NSWindow(SDL_Window *win) {
    SDL_SysWMinfo wmi;
    SDL_VERSION(&wmi.version);
    if (SDL_GetWindowWMInfo(win, &wmi)) {
        switch (wmi.subsystem) {
            case SDL_SYSWM_COCOA:
                wmi.info.cocoa.window.collectionBehavior = NSWindowCollectionBehaviorFullScreenAuxiliary;
                break;
            default: ;
        }
    }
}