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-rw-r--r--liblangtag/lt-lock.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/liblangtag/lt-lock.h b/liblangtag/lt-lock.h
index bb14cff..0194e1d 100644
--- a/liblangtag/lt-lock.h
+++ b/liblangtag/lt-lock.h
@@ -1,7 +1,7 @@
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* lt-lock.h
- * Copyright (C) 2011-2012 Akira TAGOH
+ * Copyright (C) 2011-2015 Akira TAGOH
*
* Authors:
* Akira TAGOH <akira@tagoh.org>
@@ -13,6 +13,10 @@
#ifndef __LT_LOCK_H__
#define __LT_LOCK_H__
+#if !defined (__LANGTAG_PRIVATE)
+#error "Unable to use the private header publicly"
+#endif
+
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif