osx man page for install_timer

install_timer(3alleg4)						  Allegro manual					    install_timer(3alleg4)

NAME
       install_timer - Installs the Allegro timer interrupt handler.

SYNOPSIS
       #include <allegro.h>

       int install_timer();

DESCRIPTION
       Installs  the  Allegro  timer  interrupt  handler. You must do this before installing any user timer routines, and also before displaying a
       mouse pointer, playing FLI animations or MIDI music, and using any of the GUI routines.

RETURN VALUE
       Returns zero on success, or a negative number on failure (but you may decide not to check  the  return  value  as  this	function  is  very
       unlikely to fail).

SEE ALSO
       remove_timer(3alleg4), install_int(3alleg4)

Allegro 							   version 4.4.2					    install_timer(3alleg4)