pbt_client->sig = "pbt_client";
pbt_client->frame.scr = pbt_scr_init(pbt_client, pbt_client->waitset,
backend, width, height, NULL, NULL);
pbt_client->sig = "pbt_client";
pbt_client->frame.scr = pbt_scr_init(pbt_client, pbt_client->waitset,
backend, width, height, NULL, NULL);