al_make_directory - Allegro 5 API

       Creates a new directory on the filesystem.  This function also creates any parent directories as needed.

       Returns  true  on  success (including if the directory already exists), otherwise returns false on error.
       Fills in Allegro’s errno to indicate the error.

       al_make_directory - Allegro 5 API

al_get_errno(3alleg5)

Allegro reference manual                                                              al_make_directory(3alleg5)

              #include <allegro5/allegro.h>

              bool al_make_directory(const char *path)