+#if __GLASGOW_HASKELL__ >= 504
+
+#define CONCURRENT Control.Concurrent
+#define EXCEPTION Control.Exception
+ /* If you want Control.Exception.try, get it as Panic.try, which
+ deals with the shift from 'tryAllIO' to 'try'. */
+#define DYNAMIC Data.Dynamic
+#define GLAEXTS GHC.Exts
+#define DATA_BITS Data.Bits
+#define DATA_INT Data.Int
+#define DATA_WORD Data.Word
+#define UNSAFE_IO System.IO.Unsafe
+#define TRACE Debug.Trace
+#define DATA_IOREF Data.IORef
+#define FIX_IO System.IO
+#define MONAD_ST Control.Monad.ST
+#define ST_ARRAY Data.Array.ST
+
+#else
+
+#define CONCURRENT Concurrent
+#define EXCEPTION Exception
+#define DYNAMIC Dynamic
+#define GLAEXTS GlaExts
+#define DATA_BITS Bits
+#define DATA_INT Int
+#define DATA_WORD Word
+#define UNSAFE_IO IOExts
+#define TRACE IOExts
+#define DATA_IOREF IOExts
+#define FIX_IO IOExts
+#define MONAD_ST ST
+#define ST_ARRAY ST
+
+#endif
+