I find nowhere on that site, where it uses quotes, and the
example1 clearly states it to be a system included.
Code:
/*****************************************************
SDL Tutorial - Example 1
Andrew M. <andrew@textux.com>
*****************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <SDL.h>
...
So I see no other way than that...