-import GHC.IOBase (IO(..))
---why not import it at __GLASGOW_HASKELL__==606 ?
-#if __GLASGOW_HASKELL__ >= 607
-import GHC.IOBase (unsafeDupableInterleaveIO)
+
+#if __GLASGOW_HASKELL__ >= 611
+import GHC.IO ( IO(..) )
+#else
+import GHC.IOBase ( IO(..) )