+typedef enum {
+ PREF_BOOL,
+ PREF_STRING
+} pref_type_t;
+
+#define BOOL_TO_PTR(_cond) ((_cond) ? (void *)1 : NULL)
+#define PTR_TO_BOOL(_ptr) ((_ptr) != NULL)
+
+#if defined __APPLE__
+#define CTRLCHAR "<Meta>"
+#define PREFERENCE_ACCEL "<Meta>comma"
+#else
+#define CTRLCHAR "<Control>"
+#define PREFERENCE_ACCEL NULL
+#endif
+
+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_close_conf(void);
+
+extern const char *subsurface_USB_name(void);
+extern const char *subsurface_icon_name(void);
+extern void subsurface_ui_setup(GtkSettings *settings, GtkWidget *menubar,
+ GtkWidget *vbox, GtkUIManager *ui_manager);
+
+extern const char *divelist_font;
+