Did you manage to fix this problem, or are there any updates on it? I am now having the same issue - presumably due to updating my Mac OS X version, because cabal was working fine before that. I can't upgrade cabal or install anything either, same reason. Gordon J. Uszkay uszkaygj@mcmaster.ca On May 22, 2010, at 7:27 AM, Ivan Lazar Miljenovic wrote:

Bill Atkins writes:

...

When I run "cabal update" on my Mac (Snow Leopard, Intel), I get:

% cabal update Downloading the latest package list from hackage.haskell.org cabal: Codec.Compression.Zlib: incompatible zlib version

I'm going to randomly guess that the version of the C zlib library that Cabal was indirectly built against is different to the one on your machine.

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

Hi, For me it turned out to be some problem with MacPorts, removing MacPorts (with all its installed ports) solved the problem regarding ZLib. I assume that a less drastic measure would also work (only remove selected ports or remove the ports from your path). Regards, Jeroen 2010/6/9 Christopher Done :

I am also experiencing this problem.

I read that the problem was fixed in the latest Cabal-install version. But I'm not sure, as I tried to install the latest Cabal-install and got 50 linker errors which I'm not prepared to tackle until the weekend.

On 8 June 2010 18:21, Gordon J. Uszkay wrote:

...

Did you manage to fix this problem, or are there any updates on it?  I am now having the same issue - presumably due to updating my Mac OS X version, because cabal was working fine before that.  I can't upgrade cabal or install anything either, same reason.

Gordon J. Uszkay uszkaygj@mcmaster.ca

On May 22, 2010, at 7:27 AM, Ivan Lazar Miljenovic wrote:

...

Bill Atkins writes:

...

When I run "cabal update" on my Mac (Snow Leopard, Intel), I get:

% cabal update Downloading the latest package list from hackage.haskell.org cabal: Codec.Compression.Zlib: incompatible zlib version

I'm going to randomly guess that the version of the C zlib library that Cabal was indirectly built against is different to the one on your machine.

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

On 10 June 2010 01:08, Gregory Collins wrote:

Jeroen Weijers writes:

...

Hi,

For me it turned out to be some problem with MacPorts, removing MacPorts (with all its installed ports) solved the problem regarding ZLib. I assume that a less drastic measure would also work (only remove selected ports or remove the ports from your path).

This specific error happens when you try to link with a 64-bit library from 32-bit GHC. So the odds are good either your flags aren't set right in /usr/bin/ghc and friends (which was an issue on 6.10), or you're linking to a non-universal copy of zlib (like the one macports will build).

I was having this problem too, so I searched through my mail and found this thread. I upgraded to the latest Haskell Platform 2010.2.0.0, but the problem persisted. I noticed that macports has a universal variant of zlib, so I installed that: sudo port install zlib +universal Then I rebuild cabal, and now it works properly. Cheers, Bernie.