debian man page for make_version

MAKE_VERSION(3alleg4)						  Allegro manual					     MAKE_VERSION(3alleg4)

NAME
       MAKE_VERSION - Create a 32 bit integer from the Allegro version

SYNOPSIS
       #include <allegro.h>

       Macro MAKE_VERSION(a, b, c)

DESCRIPTION
       This macro can be used to check if some Allegro version is (binary) compatible with the current version. It is safe to use > and < to check
       if one version is more recent than another.  The third number is ignored if the second number is even, so MAKE_VERSION(4, 2, 0) is  equiva-
       lent to MAKE_VERSION(4, 2, 1).  This is because of our version numbering policy since 4.0.0: the second number is even for stable releases,
       which must be ABI-compatible with earlier versions of the same series.  This macro is mainly useful for addon packages and  libraries.  See
       the `ABI compatibility information' section of the manual for more detailed information. Example:

	  /* Check if the current version is compatible with Allegro 4.2.0 */
	  #if (MAKE_VERSION(4, 2, 0) <= MAKE_VERSION(ALLEGRO_VERSION, 
			     ALLEGRO_SUB_VERSION, ALLEGRO_WIP_VERSION))
	     /* Allegro 4.2.0 compatibility */
	  #else
	     /* Work-around */
	  #endif

SEE ALSO
       ALLEGRO_VERSION(3alleg4), ALLEGRO_SUB_VERSION(3alleg4), ALLEGRO_WIP_VERSION(3alleg4)

Allegro 							   version 4.4.2					     MAKE_VERSION(3alleg4)