--- Libc/Libc-825.26/secure/sprintf_chk.c
+++ Libc/Libc-594.9.4/secure/sprintf_chk.c
@@ -28,7 +28,8 @@
 
 extern void __chk_fail (void) __attribute__((__noreturn__));
 extern int __sprintf_chk (char * __restrict, int, size_t,
-                          const char * __restrict, ...);
+                          const char * __restrict, ...)
+  __DARWIN_LDBL_COMPAT (__sprintf_chk);
 
 int
 __sprintf_chk (char *s, int flags, size_t len, const char *format, ...)