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diff --git a/ns/ext/ui-resize/ui-resize.h b/ns/ext/ui-resize/ui-resize.h
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+++ b/ns/ext/ui-resize/ui-resize.h
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+/*
+  Copyright 2011 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef LV2_UI_RESIZE_H
+#define LV2_UI_RESIZE_H
+
+#define LV2_UI_RESIZE_URI "http://lv2plug.in/ns/ext/ui-resize"
+
+typedef void* LV2_UI_Resize_Feature_Data;
+
+/**
+   UI Resize Feature.
+
+   This structure may be used in two ways: as a feature passed by the host
+   (e.g. via the features parameter of LV2UI_Descriptor::instantiate()) or
+   as a feature exposed by a UI (e.g. via LV2UI_Descriptor::extension_data()).
+
+   In both cases, the URI to be used is
+   http://lv2plug.in/ns/ext/ui-resize#UIResize
+*/
+typedef struct {
+
+	LV2_UI_Resize_Feature_Data data;
+
+	/**
+	   Request or notify a size change.
+
+	   When this struct is provided by the host, the UI may call this
+	   function to notify the host that a size change is desired, or notify
+	   the host of the initial size of the UI.
+
+	   When this struct is provided by the plugin, the host may call this
+	   function in the UI thread to notify the UI that it should change its
+	   size to the given dimensions.
+
+	   @return 0 on success.
+	*/
+	int (*ui_resize)(LV2_UI_Resize_Feature_Data data,
+	                 int                        width,
+	                 int                        height);
+
+} LV2_UI_Resize_Feature;
+
+#endif  /* LV2_UI_RESIZE_H */
+