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-rw-r--r--gl/lib/sockets.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/gl/lib/sockets.h b/gl/lib/sockets.h
index 75e49fce..55d5e3a4 100644
--- a/gl/lib/sockets.h
+++ b/gl/lib/sockets.h
@@ -1,6 +1,6 @@
/* sockets.h - wrappers for Windows socket functions
- Copyright (C) 2008-2022 Free Software Foundation, Inc.
+ Copyright (C) 2008-2023 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
@@ -20,6 +20,11 @@
#ifndef SOCKETS_H
#define SOCKETS_H 1
+/* This file uses _GL_ATTRIBUTE_CONST. */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
#define SOCKETS_1_0 0x0001
#define SOCKETS_1_1 0x0101
#define SOCKETS_2_0 0x0002