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-rw-r--r--lib/c-strcase.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/c-strcase.h b/lib/c-strcase.h
index 3e874b5e..b75e8dd1 100644
--- a/lib/c-strcase.h
+++ b/lib/c-strcase.h
@@ -1,5 +1,5 @@
/* Case-insensitive string comparison functions in C locale.
- Copyright (C) 1995-1996, 2001, 2003, 2005, 2009-2022 Free Software
+ Copyright (C) 1995-1996, 2001, 2003, 2005, 2009-2024 Free Software
Foundation, Inc.
This file is free software: you can redistribute it and/or modify
@@ -18,6 +18,11 @@
#ifndef C_STRCASE_H
#define C_STRCASE_H
+/* This file uses _GL_ATTRIBUTE_PURE. */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
#include <stddef.h>