Supporting GHC7 (Krzysztof Skrzętnicki).

Lang.hs

@@ -1,7 +1,13 @@
+{-# LANGUAGE CPP #-}
+
 module Lang where
 
 import DynFlags
 import Types
 
 listLanguages :: Options -> IO String
+#if __GLASGOW_HASKELL__ >= 700
+listLanguages opt = return $ convert opt supportedLanguagesAndExtensions
+#else
 listLanguages opt = return $ convert opt supportedLanguages
+#endif