Remove a friend declaration that's no longer used.
diff --git a/include/fruit/component_function.h b/include/fruit/component_function.h
index 7fe9c7d..56b77a1 100644
--- a/include/fruit/component_function.h
+++ b/include/fruit/component_function.h
@@ -36,10 +36,6 @@
      */
     ComponentFunction(ComponentType (*getComponent)(ComponentFunctionArgs...), ComponentFunctionArgs... args);
 
-	template <typename... ActualArgs>
-    friend ComponentFunction<ComponentType, ComponentFunctionArgs...> componentFunction(
-		ComponentType (*getComponent)(ComponentFunctionArgs...), ActualArgs&&... args);
-
     friend struct fruit::impl::ComponentStorageEntry;
 
 public: