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diff --git a/src/H5Ipkg.h b/src/H5Ipkg.h
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+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * 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 files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
+ * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Programmer:	Quincey Koziol <koziol@ncsa.uiuc.edu>
+ *		Thursday, May 15, 2003
+ *
+ * Purpose:	This file contains declarations which are visible only within
+ *		the H5I package.  Source files outside the H5I package should
+ *		include H5Iprivate.h instead.
+ */
+#ifndef H5I_PACKAGE
+#error "Do not include this file outside the H5I package!"
+#endif
+
+#ifndef _H5Ipkg_H
+#define _H5Ipkg_H
+
+/* Get package's private header */
+#include "H5Iprivate.h"
+
+/* Other private headers needed by this file */
+
+/**************************/
+/* Package Private Macros */
+/**************************/
+
+/*
+ * Number of bits to use for Group ID in each atom. Increase if H5I_NGROUPS
+ * becomes too large (an assertion would fail in H5I_init_interface). This is
+ * the only number that must be changed since all other bit field sizes and
+ * masks are calculated from GROUP_BITS.
+ */
+#define GROUP_BITS	5
+#define GROUP_MASK	((1<<GROUP_BITS)-1)
+
+/*
+ * Number of bits to use for the Atom index in each atom (assumes 8-bit
+ * bytes). We don't use the sign bit.
+ */
+#define ID_BITS		((sizeof(hid_t)*8)-(GROUP_BITS+1))
+#define ID_MASK		((1<<ID_BITS)-1)
+
+/* Map an atom to a Group number */
+#define H5I_GROUP(a)	((H5I_type_t)(((hid_t)(a)>>ID_BITS) & GROUP_MASK))
+
+
+/****************************/
+/* Package Private Typedefs */
+/****************************/
+
+/******************************/
+/* Package Private Prototypes */
+/******************************/
+
+#endif /*_H5Ipkg_H*/