Re: [Haskell-cafe] cabal problem on OS X

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.