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diff --git a/src/H5PLextern.h b/src/H5PLextern.h
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+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://www.hdfgroup.org/licenses.               *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:     Header file for writing external HDF5 plugins.
+ */
+
+#ifndef H5PLextern_H
+#define H5PLextern_H
+
+/* Include HDF5 header */
+#include "hdf5.h"
+
+/* plugins always export */
+#if defined(_MSC_VER) /* MSVC Compiler Case */
+#define H5PLUGIN_DLL __declspec(dllexport)
+#elif (__GNUC__ >= 4) /* GCC 4.x has support for visibility options */
+#define H5PLUGIN_DLL __attribute__((visibility("default")))
+#else
+#define H5PLUGIN_DLL
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+H5PLUGIN_DLL H5PL_type_t H5PLget_plugin_type(void);
+H5PLUGIN_DLL const void *H5PLget_plugin_info(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* H5PLextern_H */