I found it a little confusing too. All variables must be in a function?
A7.03 SED 7.02.4

Code:

---

// Lite-C Pure Mode
// main.c
#include <acknex.h>
#include <default.c>

var fps_max = 60; // <- this var must be in a function?

void main()
{
	screen_color.red = 125; //  <- doesn't work, stays blue?
	level_load("world.wmb");
	wait(3);
}

---