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 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