For GHC, implement the Typeable.hs macros using standalone deriving

[ghc-base.git] / System / Timeout.hs

diff --git a/System/Timeout.hs b/System/Timeout.hs
index dbd7181..df33625 100644 (file)
--- a/System/Timeout.hs
+++ b/System/Timeout.hs
@@ -1,4 +1,7 @@
 {-# LANGUAGE CPP #-}
+#ifdef __GLASGOW_HASKELL__
+{-# LANGUAGE DeriveDataTypeable, StandaloneDeriving #-}
+#endif
 
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