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--- gtk/gtkthemes.c
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+++ gtk/gtkthemes.c
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@@ -90,7 +90,7 @@ gtk_theme_engine_get (const gchar *name)
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        g_free(engine_path);
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        if (!library)
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 	 {
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-	   g_warning (g_module_error());
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+	   g_warning ("%s", g_module_error());
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 	   return NULL;
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 	 }
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        else
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@@ -107,7 +107,7 @@ gtk_theme_engine_get (const gchar *name)
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 		!g_module_symbol (library, "theme_exit", 
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 				  (gpointer *)&result->exit))
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 	      {
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-		g_warning (g_module_error());
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+		g_warning ("%s", g_module_error());
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 		g_free (result);
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 		return NULL;
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 	      }