register_driver (&options, "-");
-#ifdef HAVE_CAIRO
/* Render to <base>.pdf. */
string_map_insert (&options, "top-margin", "0");
string_map_insert (&options, "bottom-margin", "0");
string_map_insert (&options, "paper-size", "99x99in");
string_map_insert (&options, "trim", "true");
register_driver (&options, "%s.pdf", output_base);
-#endif
string_map_insert (&options, "box", "unicode");
register_driver (&options, "%s.txt", output_base);