extern int DisplayMinX, DisplayMaxX;
extern int DisplayMinY, DisplayMaxY;
-extern void subDisplayLevel();
-extern void ScrollTo(int, int);
-extern void ScrollTowards(int, int);
-extern void SoftScrollTo(int, int, int, int);
+void subDisplayLevel(void);
+void ScrollTo(int, int);
+void ScrollTowards(int, int);
+void SoftScrollTo(int, int, int, int);
-#endif /* DISPLAY_H */
+#endif // DISPLAY_H