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diff --git a/psi/zncdummy.c b/psi/zncdummy.c
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+++ b/psi/zncdummy.c
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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.
+*/
+
+/* Sample implementation for client custom processing of color spaces. */
+
+/*
+ * This module has been created to demonstrate how to add support for the use
+ * of custom color handling to the Ghostscript graphics library via a custom color
+ * callback mechanism.
+ *
+ * See the comments at the start of src/gsncdummy.c for more information.
+ */
+
+#include "math_.h"
+#include "memory_.h"
+#include "gx.h"
+#include "gscdefs.h"
+#include "gsnamecl.h"
+#include "malloc_.h"
+#include "ghost.h"
+#include "oper.h"
+#include "gsncdummy.h"
+
+/*
+ * This procedure is here to simplify debugging.  Normally one would expect the
+ * custom color callback structure to be set up by a calling application.
+ * Since I do not have a calling application, I need a simple way to setup the
+ * callback parameter.  The callback parameter is passed as a string value.
+ * This routine puts the address of our demo callback structure into the
+ * provided string.
+ *
+ * This routine allows the demo version of the PANTONE logic to be enabled
+ * by adding the following to the command line:
+ *  -c "<< /CustomColorCallback 32 string .pantonecallback >> setsystemparams" -f
+ */
+
+/* <string> .pantonecallback <string> */
+static int
+zpantonecallback(i_ctx_t *i_ctx_p)
+{
+    return 0;
+}
+
+/* ------ Initialization procedure ------ */
+
+const op_def pantone_op_defs[] =
+{
+    {"1.pantonecallback", zpantonecallback},
+    op_def_end(0)
+};