pkgconf_queue_solve
if (!pkgconf_queue_solve(&pkg_client, &pkgq, &world, maximum_traverse_depth))
PKGCONF_API bool pkgconf_queue_solve(pkgconf_client_t *client, pkgconf_list_t *list, pkgconf_pkg_t *world, int maxdepth);
if (!pkgconf_queue_solve(client, list, &world, maxdepth))