--- Libc/Libc-825.25/secure/vsprintf_chk.c
+++ Libc/Libc-583/secure/vsprintf_chk.c
@@ -28,7 +28,8 @@
 
 extern void __chk_fail (void) __attribute__((__noreturn__));
 extern int __vsprintf_chk (char * __restrict, int, size_t,
-                           const char * __restrict, va_list arg);
+                           const char * __restrict, va_list arg)
+  __DARWIN_LDBL_COMPAT (__vsprintf_chk);
 
 int
 __vsprintf_chk (char *s, int flags, size_t len, const char *format,