debian man page for os_revision

os_version(3alleg4)						  Allegro manual					       os_version(3alleg4)

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(3alleg4), os_multitasking(3alleg4)

Allegro 							   version 4.4.2					       os_version(3alleg4)