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diff --git a/psi/ierrors.h b/psi/ierrors.h
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+/* Copyright (C) 2001-2012 Artifex Software, Inc.
+   All Rights Reserved.
+
+   This software is provided AS-IS with no warranty, either express or
+   implied.
+
+   This software is distributed under license and may not be copied,
+   modified or distributed except as expressly authorized under the terms
+   of the license contained in the file LICENSE in this distribution.
+
+   Refer to licensing information at http://www.artifex.com or contact
+   Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134, San Rafael,
+   CA  94903, U.S.A., +1(415)492-9861, for further information.
+*/
+
+
+/* Definition of error codes */
+
+#ifndef ierrors_INCLUDED
+#  define ierrors_INCLUDED
+
+#include "gserrors.h"
+
+/*
+ * DO NOT USE THIS FILE IN THE GRAPHICS LIBRARY.
+ * THIS FILE IS PART OF THE POSTSCRIPT INTERPRETER.
+ * USE gserrors.h IN THE LIBRARY.
+ */
+
+/*
+ * A procedure that may return an error always returns
+ * a non-negative value (zero, unless otherwise noted) for success,
+ * or negative for failure.
+ * We use ints rather than an enum to avoid a lot of casting.
+ */
+
+/* Define the error name table */
+extern const char *const gs_error_names[];
+
+                /* ------ PostScript Level 1 errors ------ */
+
+#define LEVEL1_ERROR_NAMES\
+ "unknownerror", "dictfull", "dictstackoverflow", "dictstackunderflow",\
+ "execstackoverflow", "interrupt", "invalidaccess", "invalidexit",\
+ "invalidfileaccess", "invalidfont", "invalidrestore", "ioerror",\
+ "limitcheck", "nocurrentpoint", "rangecheck", "stackoverflow",\
+ "stackunderflow", "syntaxerror", "timeout", "typecheck", "undefined",\
+ "undefinedfilename", "undefinedresult", "unmatchedmark", "VMerror"
+
+        /* ------ Additional Level 2 errors (also in DPS) ------ */
+
+#define LEVEL2_ERROR_NAMES\
+ "configurationerror", "undefinedresource", "unregistered"
+
+        /* ------ Additional DPS errors ------ */
+
+#define DPS_ERROR_NAMES\
+ "invalidcontext", "invalidid"
+
+#define ERROR_NAMES\
+ LEVEL1_ERROR_NAMES, LEVEL2_ERROR_NAMES, DPS_ERROR_NAMES
+
+/*
+ * Define which error codes require re-executing the current object.
+ */
+#define GS_ERROR_IS_INTERRUPT(ecode)\
+  ((ecode) == gs_error_interrupt || (ecode) == gs_error_timeout)
+
+#endif /* ierrors_INCLUDED */