I'm trying to install template-haskell-2.4.0.0 on OS X with ghc 6.10.4, but get a compilation error: cabal install template-haskell-2.4.0.0 Resolving dependencies... Configuring template-haskell-2.4.0.0... Preprocessing library template-haskell-2.4.0.0... Building template-haskell-2.4.0.0... [1 of 7] Compiling Language.Haskell.TH.Syntax.Internals ( Language/Haskell/TH/Syntax/Internals.hs, dist/build/Language/Haskell/TH/Syntax/Internals.o ) [2 of 7] Compiling Language.Haskell.TH.Syntax ( Language/Haskell/TH/Syntax.hs, dist/build/Language/Haskell/TH/Syntax.o ) [3 of 7] Compiling Language.Haskell.TH.PprLib ( Language/Haskell/TH/PprLib.hs, dist/build/Language/Haskell/TH/PprLib.o ) [4 of 7] Compiling Language.Haskell.TH.Ppr ( Language/Haskell/TH/Ppr.hs, dist/build/Language/Haskell/TH/Ppr.o ) [5 of 7] Compiling Language.Haskell.TH.Lib ( Language/Haskell/TH/Lib.hs, dist/build/Language/Haskell/TH/Lib.o ) [6 of 7] Compiling Language.Haskell.TH ( Language/Haskell/TH.hs, dist/build/Language/Haskell/TH.o ) [7 of 7] Compiling Language.Haskell.TH.Quote ( Language/Haskell/TH/Quote.hs, dist/build/Language/Haskell/TH/Quote.o ) Language/Haskell/TH/Quote.hs:31:12: Not in scope: data constructor `CharConstr' cabal: Error: some packages failed to install: template-haskell-2.4.0.0 failed during the building phase. The exception was: exit: ExitFailure 1 The offending piece of code is: dataToQa mkCon mkLit appCon antiQ t = case antiQ t of Nothing -> case constrRep constr of AlgConstr _ -> appCon con conArgs IntConstr n -> mkLit $ integerL n FloatConstr n -> mkLit $ rationalL (toRational n) CharConstr c -> mkLit $ charL c I have base 4.1.0.0 installed. Cheers, Bernie.