diff --git a/src/include/stdlib.h b/src/include/stdlib.h
index 77ce5c9..43a6356 100644
--- a/src/include/stdlib.h
+++ b/src/include/stdlib.h
@@ -36,4 +36,6 @@
 int atoi(const char *str);
 long strtol(const char * __restrict nptr, char ** __restrict endptr, int base);
 
+const char *getprogname(void);
+
 #endif
diff --git a/src/include/string.h b/src/include/string.h
index 942444d..c5fb9a3 100644
--- a/src/include/string.h
+++ b/src/include/string.h
@@ -43,6 +43,11 @@
 size_t   strlcat(char *, const char *, size_t);
 size_t   strlcpy(char *, const char *, size_t);
 int      bcmp(const void *, const void *, size_t);      /* LEGACY */
+char *strchr(const char *s, int c);
+char *strrchr(const char *s, int c);
+char *strerror(int errnum);
+int strerror_r(int errnum, char *strerrbuf, size_t buflen);
+
 /**** END ****/
 
 #endif