Try upgrading wai-extra to the newest version (0.2.4), and let me know if that solves it. Older versions linked against the zlib system library directly, but now it goes through zlib-enumerator, which just takes the functions from the zlib Haskell library. I believe having the zlib library imported by both wai-extra and zlib-bindings is causing the issue. Michael On Sun, Oct 17, 2010 at 6:42 PM, Max Cantor wrote:

Has anyone on the list had trouble building yesod-0.5.4?  I'm getting the same linker error as interferon described here:  http://hpaste.org/40633/

I tried all the usual suspects.. cabal install --reinstall <every relevant package>

Seems to be a conflict between zlib and zlib-bindings.

Thanks, Max

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