.TH "al_install_system(3alleg5) Allegro reference manual" "" "" "" ""
.SH NAME
.PP
al_install_system \- Allegro 5 API
.SH SYNOPSIS
.IP
.nf
\f[C]
#include\ <allegro5/allegro.h>

bool\ al_install_system(int\ version,\ int\ (*atexit_ptr)(void\ (*)(void)))
\f[]
.fi
.SH DESCRIPTION
.PP
Initialize the Allegro system.
No other Allegro functions can be called before this (with one or two
exceptions).
.PP
The version field should always be set to ALLEGRO_VERSION_INT.
.PP
If atexit_ptr is non\-NULL, and if hasn\[aq]t been done already,
al_uninstall_system(3alleg5) will be registered as an atexit function.
.PP
Returns true if Allegro was successfully initialized by this function
call (or already was initialized previously), false if Allegro cannot be
used.
.SH SEE ALSO
.PP
al_init(3alleg5)