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diff --git a/ir_gui.cc b/ir_gui.cc
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index 74ff90a..0f482c6 100644
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--- a/ir_gui.cc
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+++ b/ir_gui.cc
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@@ -1523,7 +1523,7 @@ static void cleanup(LV2UI_Handle ui) {
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 	free(cp);
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 }
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-static LV2UI_Handle instantiate(const struct _LV2UI_Descriptor * descriptor,
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+static LV2UI_Handle instantiate(const struct LV2UI_Descriptor * descriptor,
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 				const char * plugin_uri,
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 				const char * bundle_path,
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 				LV2UI_Write_Function write_function,