extern void subsurface_open_conf(void);
extern void subsurface_set_conf(char *name, pref_type_t type, const void *value);
extern const void *subsurface_get_conf(char *name, pref_type_t type);
extern void subsurface_open_conf(void);
extern void subsurface_set_conf(char *name, pref_type_t type, const void *value);
extern const void *subsurface_get_conf(char *name, pref_type_t type);
extern void report_error(GError* error);
extern int process_ui_events(void);
extern void update_progressbar(progressbar_t *progress, double value);
extern void report_error(GError* error);
extern int process_ui_events(void);
extern void update_progressbar(progressbar_t *progress, double value);