--- ./src/FRP/Reactive/Num.hs.orig	2010-07-28 18:48:55.000000000 +0200
+++ ./src/FRP/Reactive/Num.hs	2012-05-13 12:54:39.226470104 +0200
@@ -1,4 +1,4 @@
-{-# LANGUAGE TypeSynonymInstances #-}
+{-# LANGUAGE TypeSynonymInstances, FlexibleInstances #-}
 {-# OPTIONS_GHC -Wall -fno-warn-orphans #-}
 ----------------------------------------------------------------------
 -- |