--- Libc/Libc-583/include/ftw.h
+++ Libc/Libc-1698.140.3/include/ftw.h
@@ -24,6 +24,9 @@
 #define	_FTW_H
 
 #include <sys/stat.h>
+#include <_bounds.h>
+
+_LIBC_SINGLE_BY_DEFAULT()
 
 /*
  * Valid flags for the 3rd argument to the function that is passed as the