al_is_system_installed(3)                            al_is_system_installed(3)

NAME
       al_is_system_installed - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              bool al_is_system_installed(void)


DESCRIPTION
       Returns true if Allegro is initialized, otherwise returns false.

Allegro reference manual                             al_is_system_installed(3)