1 files changed, 7 insertions, 2 deletions

diff --git a/gl/unlocked-io.h b/gl/unlocked-io.h
index fdef624a..0cd9bbf3 100644
--- a/gl/unlocked-io.h
+++ b/gl/unlocked-io.h
@@ -1,6 +1,6 @@
 /* Prefer faster, non-thread-safe stdio functions if available.
 
-   Copyright (C) 2001-2004, 2009-2023 Free Software Foundation, Inc.
+   Copyright (C) 2001-2004, 2009-2024 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -31,6 +31,11 @@
    the *_unlocked functions directly.  On hosts that lack those
    functions, invoke the non-thread-safe versions instead.  */
 
+/* This file uses HAVE_DECL_*_UNLOCKED.  */
+# if !_GL_CONFIG_H_INCLUDED
+#  error "Please include config.h first."
+# endif
+
 # include <stdio.h>
 
 # if HAVE_DECL_CLEARERR_UNLOCKED || defined clearerr_unlocked
@@ -96,7 +101,7 @@
 #  define fwrite_unlocked(w,x,y,z) fwrite (w,x,y,z)
 # endif
 
-# if HAVE_DECL_GETC_UNLOCKED || defined get_unlocked
+# if HAVE_DECL_GETC_UNLOCKED || defined getc_unlocked
 #  undef getc
 #  define getc(x) getc_unlocked (x)
 # else