pollution: crypt
extern char *crypt(const char *, const char *); 

pollution: ctermid_r
extern char *ctermid_r(char *); 

pollution: gethostid
extern long gethostid(void); 

pollution: lockf
extern int lockf(int, int, off_t); 

pollution: nice
extern int nice(int); 

pollution: setpgrp
extern pid_t setpgrp(void); 

pollution: setregid
extern int setregid(gid_t, gid_t); 

pollution: setreuid
extern int setreuid(uid_t, uid_t); 

pollution: swab
extern void swab(const void *restrict, void *restrict, ssize_t); 

pollution: sync
extern void sync(void);