[Haskell-cafe] Fwd: problem with cabal install MissingH-

Ozgur Akgun ozgurakgun at gmail.com
Thu Sep 22 19:19:12 CEST 2011

Ooops, apparently I forgot to reply to the list. Sorry.

---------- Forwarded message ----------
From: Ozgur Akgun <ozgurakgun at gmail.com>
Date: 22 September 2011 16:49
Subject: Re: [Haskell-cafe] problem with cabal install MissingH-
To: Mariano Cortesi <mcortesi at gmail.com>

Hi Mariano.

On 22 September 2011 12:48, Mariano Cortesi <mcortesi at gmail.com> wrote:

> I'm with mac OS X lion, ghc version 7.2.1
> and when a i try to install MissingH version it fails with
> [24 of 47] Compiling Data.BinPacking  ( src/Data/BinPacking.hs,
> dist/build/Data/BinPacking.o )
> src/Data/BinPacking.hs:45:6:
>     Illegal datatype context (use -XDatatypeContexts): (Num size,

This is weird, because on OS X Lion, and with the following versions, it
doesn't fail for me:

The Glorious Glasgow Haskell Compilation System, version 7.2.1
cabal-install version 0.10.2
using version 1.12.0 of the Cabal library

 Nevertheless, you can try the following to do what cabal asks you to do:

cabal install --ghc-option=-XDatatypeContexts

Which will give a warning, but should succeed anyway.

Hope this helps,

Ozgur Akgun
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