Change Allegro Background Color

[Crommissar]

Hey guys! how are you?
I just started some tutorials on Allegro and I dont know how to change the background color on it, Im on Dev-C++ and when I start a new project, an "Allegro Application [Static]" this default code show up:

#include <allegro.h>

void init();
void deinit();

int main() {
init();

while (!key[KEY_ESC]) {
/* put your code here */
}

deinit();
return 0;
}
END_OF_MAIN()

void init() {
int depth, res;
allegro_init();
depth = desktop_color_depth();
if (depth == 0) depth = 32;
set_color_depth(depth);
res = set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);
if (res != 0) {
allegro_message(allegro_error);
exit(-1);
}

install_timer();
install_keyboard();
install_mouse();
/* add other initializations here */
}

void deinit() {
clear_keybuf();
/* add other deinitializations here */
}


I know that this is the key to change it but I tried switching some numbers and the background is still black.

void init() {
int depth, res;
allegro_init();
depth = desktop_color_depth();
if (depth == 0) depth = 32;
set_color_depth(depth);
res = set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);
if (res != 0) {
allegro_message(allegro_error);
exit(-1);
}
somebody know how to do it?