ALLEGRO_SYSTEM_ID - Allegro 5 API

       The system Allegro is running on.

       • ALLEGRO_SYSTEM_ID_UNKNOWN - Unknown system.

       • ALLEGRO_SYSTEM_ID_XGLX - Xglx

       • ALLEGRO_SYSTEM_ID_WINDOWS - Windows

       • ALLEGRO_SYSTEM_ID_MACOSX - macOS

       • ALLEGRO_SYSTEM_ID_ANDROID - Android

       • ALLEGRO_SYSTEM_ID_IPHONE - iOS

       • ALLEGRO_SYSTEM_ID_GP2XWIZ - GP2XWIZ

       • ALLEGRO_SYSTEM_ID_RASPBERRYPI - Raspberry Pi

       • ALLEGRO_SYSTEM_ID_SDL - SDL

       ALLEGRO_SYSTEM_ID - Allegro 5 API

al_get_system_id(3alleg5)

Allegro reference manual                                                              ALLEGRO_SYSTEM_ID(3alleg5)

       5.2.5

              #include <allegro5/allegro.h>

              enum ALLEGRO_SYSTEM_ID {