Working SDL example

rect.c

// gcc rect.c -o rect `sdl-config --cflags` `sdl-config --libs` && ./rect

// cflags: -I/usr/local/include/SDL -D_GNU_SOURCE=1 -D_THREAD_SAFE
// libs: -L/usr/local/lib -lSDLmain -lSDL -Wl,-framework,Cocoa

#include "SDL.h"
#include <stdbool.h>
#include <unistd.h>

SDL_Surface *screen;

SDL_Event event;

int main(int argc, char *argv[]) {
    SDL_Init(SDL_INIT_VIDEO);

    screen = SDL_SetVideoMode(640, 480, 16, SDL_SWSURFACE);

    SDL_WM_SetCaption("Simple Window", "Simple Window");

    bool done=false;

    while(!done) {
        while(SDL_PollEvent(&event)) {
            if (event.type == SDL_QUIT) {
                done=true;
            }
        }

        // fill the screen with black color
        SDL_FillRect(screen, &screen->clip_rect, SDL_MapRGB(screen->format, 0, 0, 0));

        // update the screen buffer
        SDL_Flip(screen);
        //usleep(1000 * 1000);
    }

    SDL_Quit();

    return 0;
}