It looks like the binary package got its own instance for the version datatype. You could probably make it build by just removing that instance from Binary.hs. And I don't want to dissuade you, but unless there is a reason for you to use jhc, just be aware that ghc has pretty much become the defacto haskell compiler and the others have started to bit rot. On Sun, Jan 24, 2016 at 7:05 AM, Fabien R wrote:

Hello, I want to build jhc 0.82 on debian/amd64. I downloaded the sources and successfully configured the build. The compilation fails with this error:

[149 of 186] Compiling Ho.Binary ( src/Ho/Binary.hs, src/Ho/Binary.o )

src/Ho/Binary.hs:164:10: Duplicate instance declarations: instance [overlap ok] Binary Data.Version.Version -- Defined at src/Ho/Binary.hs:164:10 instance [safe] Binary Data.Version.Version -- Defined in `binary-0.8.0.0:Data.Binary.Class' Makefile:1441: recipe for target 'jhc' failed

The corresponding source code in src/Ho/Binary.hs is:

import Data.Binary import qualified Data.Version

instance Binary Data.Version.Version where put (Data.Version.Version a b) = put a >> put b get = liftM2 Data.Version.Version get get

In the package binary, is this error due to this line ?

import Data.Version (Version(..))

Any hint to solve this ?

-- Fabien

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