-extern void bp_enable_cachepath(void);
-extern void bp_disable_cachepath(void);
-extern void bp_clear_cachepath(void);
-extern char *BestDistPath(char *, struct sctstr *, struct sctstr *,
- double *);
-extern char *BestLandPath(char *, struct sctstr *, struct sctstr *,
- double *, int);
-extern char *BestShipPath(char *, int, int, int, int, int);
-extern char *BestAirPath(char *, int, int, int, int);
-extern double pathcost(struct sctstr *, char *, int);