Provided by: allegro5-doc_5.2.4.0-3_all bug

NAME

       ALLEGRO_PI - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              #define ALLEGRO_PI        3.14159265358979323846

DESCRIPTION

       C99  compilers have no predefined value like M_PI for the constant π, but you can use this
       one instead.