On 27 November 2010 10:41, Paul Johnson wrote:

I installed gtk2hs-buildtools as per the Leksah page, and then tried to install Leksah itself. I got:

[root@eiffel download]# cabal install leksah Resolving dependencies... cabal: cannot configure leksah-server-0.8.0.8. It requires ghc>=6.10.1&& <6.13 There is no available version of ghc that satisfies>=6.10.1&& <6.13

But there is...

[root@eiffel download]# ghc --version The Glorious Glasgow Haskell Compilation System, version 6.12.3

I don't know whether this is a problem with the GHC installation or the Leksah build. I'm running Fedora 14 with GHC installed through the package manager.

Interesting. Perhaps Cabal isn't looking at the same GHC version. If you run cabal install with --version passed to GHC, GHC will just output the version instead of doing any compiling and the install will stop. You can see what version Cabal actually uses. Maybe it's different? chris@cn-done:~$ cabal install codepad --ghc-options=--version Resolving dependencies... Configuring mtl-1.1.1.0... The Glorious Glasgow Haskell Compilation System, version 6.12.3

Hi Paul, ghc is a package, which exposes Ghc-Api as a library. It gets usually installed, when you install Ghc or Haskell platform. As I remeber , it is usually in a hidden state, but ghc-pkg list should show it. Jürgen Paul Johnson-2 wrote:

On 27/11/10 11:25, Christopher Done wrote:

...

Interesting. Perhaps Cabal isn't looking at the same GHC version. If you run cabal install with --version passed to GHC, GHC will just output the version instead of doing any compiling and the install will stop. You can see what version Cabal actually uses. Maybe it's different?

Cabal is using ghc-6.12.3. However with Leksah it doesn't seem to be getting that far: it seems to be looking for a package called "ghc" during dependency analysis. However when I run "ghc-pkg list" there is no such package. Obviously this is meant to be a package that flags the compiler version for Cabal. Is it a bug that I don't have one?

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On Sat, Nov 27, 2010 at 10:58:37AM -0500, Albert Y. C. Lai wrote:

On 10-11-27 09:20 AM, jutaro wrote:

...

ghc is a package, which exposes Ghc-Api as a library. It gets usually installed, when you install Ghc or Haskell platform. As I remeber , it is usually in a hidden state, but ghc-pkg list should show it.

Except that Fedora's GHC really doesn't come with the ghc api. It is nowhere to be found in http://rpmfind.net//linux/RPM/fedora/devel/rawhide/i386/ghc-6.12.3-9.fc15.i6... (contains complete file listing)

It doesn't seem to be in Fedora's haskell platform (and its dependencies) either.

GHC api may be in the ghc-ghc-{,devel,prof} packages. Have you tried `yum install ghc-ghc-devel` ? FYI I've recently cabal-install'ed leksah on Fedora14. It's not as easy as one could hope (you need to set cabal 'preference' to mtl>=2.0'), but it's possible. regards, /John

On Fri, Nov 26, 2010 at 12:48 AM, Ross Paterson wrote:

On Fri, Nov 26, 2010 at 12:24:26AM +0100, Bas van Dijk wrote:

...

Maybe it helps if special-functors gets an upper bound on its mtl dependency: mtl < 2.

It should have mtl < 1.1.1.0, because that version lacks one of the instances it relies on.

(CCing this to the special-functors maintainer.) Henning, could you add this upper bound to the mtl dependency? Thanks, Bas

On 25 Nov 2010 at 23:48:27, Ross Paterson wrote:

On Fri, Nov 26, 2010 at 12:24:26AM +0100, Bas van Dijk wrote:

...

Maybe it helps if special-functors gets an upper bound on its mtl dependency: mtl < 2.

It should have mtl < 1.1.1.0, because that version lacks one of the instances it relies on.

Well, that certainly breaks the dependency loop, but still leaves the overall fetch broken. <log> C:\Source\Haskell\Wrapper>cabal fetch mtl-2.0.0.0 Resolving dependencies... cabal: cannot configure special-functors-1.0.0.1. It requires mtl >=1.0 && <1.1.1 For the dependency on mtl >=1.0 && <1.1.1 there are these packages: mtl-1.0, mtl-1.1.0.0, mtl-1.1.0.1 and mtl-1.1.0.2. However none of them are available. mtl-1.0 was excluded because mtl-2.0.0.0 was selected instead mtl-1.0 was excluded because of the top level dependency mtl ==2.0.0.0 mtl-1.1.0.0 was excluded because mtl-2.0.0.0 was selected instead mtl-1.1.0.0 was excluded because of the top level dependency mtl ==2.0.0.0 mtl-1.1.0.1 was excluded because mtl-2.0.0.0 was selected instead mtl-1.1.0.1 was excluded because of the top level dependency mtl ==2.0.0.0 mtl-1.1.0.2 was excluded because mtl-2.0.0.0 was selected instead mtl-1.1.0.2 was excluded because of the top level dependency mtl ==2.0.0.0 </log> I've tried installing transformers-0.2.2.0, but that doesn't seem to help either. Ah, but running with --verbose=3 shows that it's using the 6.4.1 version of ghc- pkg, which doesn't have transformers-0.2.2.0 installed, and if it did would have the dependency on special-functors. I'm fairly sure I've got a pre-built cabal command-line binary, the 6.12.3 version of ghc-pkg is first on the PATH, and there's nothing relevant in ~/cabal/config (I'm on Windows, but we all know what I mean by that). So where's it getting the 6.4.1 ghc-pkg from? I've tried overriding --with-hc-pkg=..., but it's an unrecognized option. -- Iain Alexander ia@stryx.demon.co.uk

On 26 Nov 2010 at 0:24, Bas van Dijk wrote:

BTW what is you ghc --version?

I have several versions available, but the one on the path at the time was probably either 6.4.1 or 6.12.3. -- Iain Alexander ia@stryx.demon.co.uk