[Haskell-cafe] problem with cabal install MissingH-

Brent Yorgey byorgey at seas.upenn.edu
Thu Sep 22 18:08:22 CEST 2011

Hi Mariano,

Unfortunately there are quite a few things (MissingH being one of
them) which have not yet been updated to work with GHC 7.2.1.  Your
options are (1) downgrade to GHC 7.0.4 for now, or (2) wait for
MissingH etc. to be updated.  You can possibly speed up (2) by sending
a bug report to the maintainer of any package you find that doesn't
work (to find the maintaner, look for the package on Hackage,
e.g. http://hackage.haskell.org/package/MissingH, and look at the
"Maintainer" field).


On Thu, Sep 22, 2011 at 08:48:48AM -0300, Mariano Cortesi wrote:
> Hi,
> My name is mariano and I'm quite new to haskell. I trying to setup up my
> environment and use the eclipse plugin for haskell. But is not working
> property because, it tries to compile the scion browser and this depends on
> MissingH which fails on build.
> 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,
>                                                         Ord size,
>                                                         Show size,
>                                                         Show obj) =>
> cabal: Error: some packages failed to install:
> MissingH- failed during the building phase. The exception was:
> ExitFailure 1
> Any ideas?
> I don't know what to do :S
> best,
> Mariano

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