tags:

views:

55

answers:

3
+1  Q: 

Cabal and zlib on OS X

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

Anyone else seeing this? Reinstalling the Haskell Platform hasn't helped. I'm unable to install or update Cabal packages at the moment, so I'd appreciate any help.

Thanks!

+1  A: 

Incompatible zlib version

I think this means the C zlib library you have installed is out of date. Can you update it?

Don Stewart  2010-05-23 23:20:52
I just installed the latest zlib and reinstalled the Haskell Platform. Same thing...
Bill  2010-05-24 00:12:21
Can you confirm what version of zlib the scripts are trying to link haskell-zlib against?
Don Stewart  2010-05-24 00:15:55
So, if I rename ~/.cabal to make it inaccessible, "cabal update" works without a hitch.
Bill  2010-05-24 00:17:35
Removing ~/.cabal/lib/zlib-0.5.2.0 did the trick!cabal is now happily updating.Thanks for the help - hopefully this post will help if someone encounters the same issue.
Bill  2010-05-24 00:20:58
I spoke too soon...I was asked to update cabal-install and after doing so I get the same error again.
Bill  2010-05-24 00:24:47
Sounds like you had a binary that was built against one version of zlib, but downloaded and built cabal-install again against a different one. Look carefully at the C zlib installations on your system.
Don Stewart  2010-05-24 01:10:02
A: 

What I've done is install zlib from MacPorts with the +universal flag and that works without problems. Does this help you?

Martijn  2010-05-25 13:48:44
A: 

So I fixed this by removing MacPorts completely from my machine, re-installing zlib with it, and then clearing out my ~/.cabal.

After that I stopped getting these messages.

Thanks, all.

Bill  2010-05-26 00:04:17

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