[Haskell-beginners] Beginner trying to install Haskell support in Eclipse and failing

[Alan Shaw]

I installed scion from hackage ok, but then I remembered this, from
http://eclipsefp.sourceforge.net/ :

You cannot use the version from Hackage (0.1.0.2) since commands have
been added for eclipsefp. You'll need to build Scion from source (git
clone git://github.com/JPMoresmau/scion.git, runhaskell Setup.hs
configure/build/install)

So I did the other thing:

cabal install -f-cabal_1_8

And now I have got updates in Eclipse from  http://eclipsefp.sf.net/updates,
and I'm about to "Create a Haskell Project." so if that process
doesn't mystify me I'm good to go for now.

And I plan to update ghc "soon."

Thanks, all!

-A


On Sat, Apr 17, 2010 at 7:43 PM, Daniel Fischer
<daniel.is.fischer at web.de> wrote:
>
> Am Sonntag 18 April 2010 01:07:17 schrieb Alan Shaw:
> > Hi,
> > I'm using cabal for the first time, and I'm confused.
> >
> > I'm trying to build scion as instructed at
> > http://eclipsefp.sourceforge.net/build.html .
> > I have done:
> >
> > git clone git://github.com/JPMoresmau/scion.git
> > cd scion
> > cabal install
> >
> >
> > I'm now at the point where this tells me the following:
> >
> > Resolving dependencies...
> > cabal.exe: dependencies conflict: ghc-6.10.4 requires Cabal ==1.6.0.3
> > however
> > Cabal-1.6.0.3 was excluded because scion-0.1.0.2 requires Cabal ==1.8.*
> > && ==1.8.*
>
> That's odd, the .cabal file says
>
>  if flag(cabal_1_8)
>    build-depends:  Cabal == 1.8.*
>    cpp-options:    -DCABAL_VERSION=108
>  else
>    build-depends:  Cabal == 1.6.*
>    cpp-options:    -DCABAL_VERSION=106
>
> and since you don't have Cabal-1.8.*, it should set the flag to false and
> try again.
>
> Anyway, try setting the flag to false on the command line:
>
> cabal install -f-cabal_1_8
>
> or install the hackage package:
>
> cabal install scion
>
> >
> > Some more information:
> >
> > $ cabal -V
> > cabal-install version 0.6.2
> > using version 1.6.0.3 of the Cabal library
> > $ cabal update
> > Downloading the latest package list from hackage.haskell.org
> > Note: there is a new version of cabal-install available.
> > To upgrade, run: cabal install cabal-install
> > $ cabal install cabal-install
> > (lots and lots of output, ending with:)
> > Linking dist\build\cabal\cabal.exe ...
> > Installing executable(s) in C:\Program Files (x86)\Haskell\bin
>
> Is that directory in your path (and before the directory cabal-
> install-0.6.2 is in)?
>
> > $ cabal -V
> > cabal-install version 0.6.2
> > using version 1.6.0.3 of the Cabal library
>
> perhaps
>
> cabal install cabal-install-0.8.0 (or whatever the latest version working
> on windows is)
>
> >
> >
> > Help?
> >
> > Thanks,
> > -A
>