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-rw-r--r--include/wchar.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/wchar.h b/include/wchar.h
index cdc4e757c3..7187d76c05 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -43,5 +43,10 @@ extern int __vfwscanf (FILE *__restrict __s,
 		       __const wchar_t *__restrict __format,
 		       __gnuc_va_list __arg)
      /* __attribute__ ((__format__ (__wscanf__, 2, 0)) */;
+extern int __vswprintf (wchar_t *__restrict __s, size_t __n,
+			__const wchar_t *__restrict __format,
+			__gnuc_va_list __arg)
+     /* __attribute__ ((__format__ (__wprintf__, 3, 0))) */;
+
 # endif
 #endif