Provided by: allegro5-doc_5.2.9.1+dfsg-1.1build4_all 

NAME
al_x_set_initial_icon - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro_x.h>
bool al_x_set_initial_icon(ALLEGRO_BITMAP *bitmap)
DESCRIPTION
On some window managers (notably Ubuntu’s Unity) al_set_display_icon doesn’t work and you need to use a
.desktop file. But with this function you can set an icon before calling al_create_display. This works
by setting the icon before XMapWindow.
SINCE
5.2.3
[Unstable API]: New API.
Allegro reference manual al_x_set_initial_icon(3alleg5)