path_order_info
const struct path_order_info *a = (const struct path_order_info *) aa;
const struct path_order_info *b = (const struct path_order_info *) bb;
struct path_order_info *info;
struct path_order_info *last_info = 0;
info = (struct path_order_info *)
alloc(sizeof(struct path_order_info) * nwords, ATEMP);
qsort(info, nwords, sizeof(struct path_order_info),