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diff --git a/frontends/riscos/wimputils.h b/frontends/riscos/wimputils.h
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+/*
+ * Copyright 2009 John-Mark Bell <jmb@netsurf-browser.org>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * NetSurf is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** \file
+ * A collection of grubby utilities for working with OSLib's wimp API.
+ */
+
+#ifndef riscos_wimputils_h_
+#define riscos_wimputils_h_
+
+#include <oslib/wimp.h>
+
+/* Magical union to permit aliasing of wimp_window_state and wimp_open
+ * Do not use this directly. Use the macros, instead. */
+typedef union window_open_state {
+	wimp_window_state state;
+	wimp_open open;
+} window_open_state;
+
+/* Convert a pointer to a wimp_window_state into a pointer to a wimp_open */
+#define PTR_WIMP_OPEN(pstate) ((wimp_open *) (window_open_state *) (pstate))
+
+/* Similarly for wimp_message_list */
+typedef struct ns_wimp_message_list {
+	/* Nasty hack to ensure that we have at least one field in the struct */
+	int first;
+	int rest[];
+} ns_wimp_message_list;
+
+typedef union message_list {
+	wimp_message_list wimp;
+	ns_wimp_message_list ns;
+} message_list;
+
+#define PTR_WIMP_MESSAGE_LIST(l) ((wimp_message_list *) (message_list *) (l))
+
+/* Also for VDU variable lists */
+typedef struct ns_os_vdu_var_list {
+	os_vdu_var first;
+	os_vdu_var rest[];
+} ns_os_vdu_var_list;
+
+typedef union vdu_var_list {
+	os_vdu_var_list os;
+	ns_os_vdu_var_list ns;
+} vdu_var_list;
+
+#define PTR_OS_VDU_VAR_LIST(l) ((os_vdu_var_list *) (vdu_var_list *) (l))
+
+#endif