There's a flag to turn it off, does that work? Try cabal install transformers-base -f-OrphanInstances

Sjoerd

On May 9, 2013, at 2:47 PM, jean-christophe mincke <jeanchristophe.mincke@gmail.com> wrote:

Hello Café

I am running into problems  when installing transformers-base-0.4.1.

Has anyone an idea about what is going on?

REM : this is a "brand new" debian install, I have just install ghc, cabal install cabal-install etc.

Thank you

very much

J-C

cabal install transformers-base

Resolving dependencies...

Downloading transformers-base-0.4.1...

Configuring transformers-base-0.4.1...

Preprocessing library transformers-base-0.4.1...

Building transformers-base-0.4.1...

[1 of 1] Compiling Control.Monad.Base ( src/Control/Monad/Base.hs, dist/build/Control/Monad/Base.o )

src/Control/Monad/Base.hs:63:10:

    Duplicate instance declarations:

      instance Applicative (L.ST s)

        -- Defined at src/Control/Monad/Base.hs:63:10

      instance Applicative (L.ST s) -- Defined in `Control.Applicative'

src/Control/Monad/Base.hs:67:10:

    Duplicate instance declarations:

      instance Applicative (S.ST s)

        -- Defined at src/Control/Monad/Base.hs:67:10

      instance Applicative (S.ST s) -- Defined in `Control.Applicative'

cabal: Error: some packages failed to install:

transformers-base-0.4.1 failed during the building phase. The exception was:

ExitFailure 1

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