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al_install_system - Allegro 5 API
#include <allegro5/allegro.h> bool al_install_system(int version, int (*atexit_ptr)(void (*)(void)))
Initialize the Allegro system. No other Allegro functions can be called before this (with one or two exceptions). The version field should always be set to ALLEGRO_VERSION_INT. If atexit_ptr is non-NULL, and if hasn't been done already, al_uninstall_system(3alleg5) will be registered as an atexit function. Returns true if Allegro was successfully initialized by this function call (or already was initialized previously), false if Allegro cannot be used.