extern int unit_interdict(coord, coord, natid, char *, int, int);
extern int off_support(coord, coord, natid, natid);
extern int def_support(coord, coord, natid, natid);
-extern int oprange(struct empobj *, int *);
+extern int oprange(struct empobj *);
extern int cando(int, int);
extern void show_mission(int, struct nstr_item *);
extern int air_defense(coord, coord, natid, struct emp_qelem *,