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os_version(3)                   Allegro manual                   os_version(3)

NAME
       os_version, os_revision - Version of the OS currently running. Allegro
       game programming library.

SYNOPSIS
       #include <allegro.h>

       extern int os_version;

       extern int os_revision;

DESCRIPTION
       The major and minor version of the Operating System currently running.
       Set by allegro_init(). If Allegro for some reason was not able to
       retrieve the version of the Operating System, os_version and
       os_revision will be set to -1. For example: Under Win98 SE (v4.10.2222)
       os_version will be set to 4 and os_revision to 10.

SEE ALSO
       os_type(3), os_multitasking(3)

Allegro                          version 4.4.2                   os_version(3)