+extern int seteuid(uid_t euid);
+extern int setegid(gid_t egid);
+//extern int setgid(gid_t gid);
+
+typedef uint32_t useconds_t;
+
+extern unsigned int sleep(unsigned int seconds);
+extern int usleep(useconds_t usec);
+extern unsigned int alarm(unsigned int seconds);
+
+// - crypt.c
+extern char *crypt(const char *key, const char *salt);
+
+// - pty.c
+extern char *ttyname(int fd);
+extern int ttyname_r(int fd, char *buf, size_t buflen);