pollution: bcmp
extern int bcmp(const void *, const void *, size_t); 

pollution: bcopy
extern void bcopy(const void *, void *, size_t); 

pollution: bzero
extern void bzero(void *, size_t); 

pollution: index
extern char *index(const char *, int); 

pollution: rindex
extern char *rindex(const char *, int); 

pollution: ffs
extern int ffs(int);