diff --git a/lib/isc/include/isc/lang.h b/lib/isc/include/isc/lang.h
new file mode 100644
index 0000000000..3edeb72da1
--- /dev/null
+++ b/lib/isc/include/isc/lang.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 1999  Internet Software Consortium.
+ * 
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+#ifndef ISC_LANG_H
+#define ISC_LANG_H 1
+
+#ifdef __cplusplus
+#define ISC_LANG_BEGINDECLS	extern "C" {
+#define ISC_LANG_ENDDECLS	}
+#else
+#define ISC_LANG_BEGINDECLS
+#define ISC_LANG_ENDDECLS
+#endif
+
+#endif /* ISC_LANG_H */