[Haskell-beginners] Problem with installing SDL

[Patrick Wheeler]

Great, I'm glad that it was a simple fix. Have fun hacking on sdl!

Patrick


On Fri, May 9, 2014 at 3:36 AM, Julian Drube <jdrube at mail.de> wrote:

> Thank you,
>
> In the file `Graphics/UI/SDL/Events.hsc` I changed the line
>
> import Data.Typeable (Typeable(typeOf),TypeRep)
>
> to just
>
> import Data.Typeable
>
> and it compiles without problems now.
>
> Julian
>
> On Thursday 08 May 2014 17:43:41 Patrick Wheeler wrote:
> > The error is saying that it can not find `typeOf` in the `Typeable`
> class.
> >  This is because that function is not longer part of the `Typeable` in
> > ghc7.8 and moving forward.  Error like this are still be sorted out for
> ghc
> > 7.8.  You are on a bleeding edge version of ghc so packaging problems
> like
> > this are expected.  Package stability is usually marked by when the
> Haskell
> > Platform updates to the new ghc version.
> >
> > So if you want additional stability HP is where it is at. If you want to
> > live and the bleeding edge then you can download sdl with cabal unpack
> and
> > see if you can not fix the problem for yourself.
> >
> > Here is a link to the `Typeable` module in base:
> >
> http://hackage.haskell.org/package/base-4.7.0.0/docs/Data-Typeable.htmlOf
> >
> > There is replacement function for backward compatibility.
> >
> http://hackage.haskell.org/package/base-4.7.0.0/docs/Data-Typeable.html#v:ty
> > peOf
> >
> > If you fixed the import statement for all of the sdl modules, you might
> fix
> > the incompatibility with the new Typeable.  There will probably be a few
> > other issues that need solving after this one. I have updated several
> > packages on a case by case basis when I need them to new ghc version and
> > has been a lesson in understanding ghc errors and fixing them. If you
> have
> > the time I recommend giving it a shot.
> >
> > Patrick
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-- 
Patrick Wheeler
Patrick.John.Wheeler at gmail.com
Patrick.J.Wheeler at rice.edu
Patrick.Wheeler at colorado.edu
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