-#ifdef NOT_YET_IMPLEMENTED
-int mblen(const char *_s, size_t _n);
-size_t mbstowcs(wchar_t *_pwcs, const char *_s, size_t _n);
-int wctomb(char *_s, wchar_t _wchar);
-int mbtowc(wchar_t *_pwc, const char *_s, size_t _n);
-double strtod(const char *_nptr, char **_endptr);
-size_t wcstombs(char *_s, const wchar_t *_pwcs, size_t _n);
+#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
+void *alloca __P((size_t)); /* built-in for gcc */
+ /* getcap(3) functions */
+char *getbsize __P((int *, long *));
+char *cgetcap __P((char *, char *, int));
+int cgetclose __P((void));
+int cgetent __P((char **, char **, char *));
+int cgetfirst __P((char **, char **));
+int cgetmatch __P((char *, char *));
+int cgetnext __P((char **, char **));
+int cgetnum __P((char *, char *, long *));
+int cgetset __P((char *));
+int cgetstr __P((char *, char *, char **));
+int cgetustr __P((char *, char *, char **));
+
+int daemon __P((int, int));
+char *devname __P((int, int));
+int getloadavg __P((double [], int));
+
+extern char *optarg; /* getopt(3) external variables */
+extern int opterr, optind, optopt;
+int getopt __P((int, char * const *, const char *));
+
+extern char *suboptarg; /* getsubopt(3) external variable */
+int getsubopt __P((char **, char * const *, char **));
+
+char *group_from_gid __P((unsigned long, int));
+int heapsort __P((void *, size_t, size_t,
+ int (*)(const void *, const void *)));
+char *initstate __P((unsigned, char *, int));
+int mergesort __P((void *, size_t, size_t,
+ int (*)(const void *, const void *)));
+int radixsort __P((const unsigned char **, int, const unsigned char *,
+ unsigned));
+int sradixsort __P((const unsigned char **, int, const unsigned char *,
+ unsigned));
+long random __P((void));
+char *realpath __P((const char *, char resolved_path[]));
+char *setstate __P((char *));
+void srandom __P((unsigned));
+char *user_from_uid __P((unsigned long, int));
+#ifndef __STRICT_ANSI__
+long long
+ strtoq __P((const char *, char **, int));
+unsigned long long
+ strtouq __P((const char *, char **, int));