al_merge_config - Allegro 5 API

       Merge  two  configuration  structures,  and  return  the  result  as  a  new  configuration.   Values  in
       configuration `cfg2' override those in  `cfg1'.   Neither  of  the  input  configuration  structures  are
       modified.  Comments from `cfg2' are not retained.

       al_merge_config - Allegro 5 API

al_merge_config_into(3alleg5)

Allegro reference manual                                                                al_merge_config(3alleg5)

              #include <allegro5/allegro.h>

              ALLEGRO_CONFIG *al_merge_config(const ALLEGRO_CONFIG *cfg1,
                  const ALLEGRO_CONFIG *cfg2)