[Haskell-cafe] Re: missingH 0.18.6 - problems with cabal configure
duncan.coutts at worc.ox.ac.uk
Wed Aug 20 19:23:58 EDT 2008
On Wed, 2008-08-20 at 20:53 +0200, Ben Franksen wrote:
> Andrew U. Frank wrote:
> > when i run cabal i get an error message:
> > :~/haskellSources/packages/MissingH-0.18.6$ runhaskell Setup configure
> > Setup.hs:19:35:
> > Couldn't match expected type `(Either
> > GenericPackageDescription
> > PackageDescription,
> > HookedBuildInfo)'
> > against inferred type `PackageDescription'
> > In the first argument of `(confHook defaultUserHooks)', namely
> > `mydescrip'
> > In the expression:
> > let
> > mydescrip = case os of
> > "mingw32" -> ...
> > _ -> ...
> > in (confHook defaultUserHooks) mydescrip flags
> > In the definition of `customConfHook':
> > customConfHook descrip flags
> > = let mydescrip = ...
> > in (confHook defaultUserHooks) mydescrip
> > flags
> > what is wrong? i use ghc 6.8.2 and cabal 18.104.22.168
> Looks like you'll have to upgrade Cabal (the library). Which version exactly
> you need I don't know but I'd try the latest and if that fails from there
> on work backwards.
Actually it's an API change that came in in Cabal-1.2.
Looking at the code in the error message it looks like you're generating
a different package description based on the OS. That can now be done
declaratively in the .cabal file itself using something like:
build-depends: base, blah, blah
Take a look in the Cabal user guide or at other .cabal files for
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