extern int chkdir(s_char, int, int);
extern int getdir(s_char *, s_char *, s_char *, s_char *);
extern void direrr(s_char *, s_char *, s_char *);
-extern double mcost(struct sctstr *, int);
extern int chkpath(natid, s_char *, coord, coord);
extern void pathrange(register coord, register coord, register s_char *,
int, struct range *);