yesodweb/wai — pull request #42 by JanAhrens (2012-02-01 20:13:58+00:00)
Title: broken zlib 0.5.3.2 causes fresh build to fail

zlib 0.5.3.2 fails to compile due to a macro expansion
error. WAI has an indirect dependency to zlib though
zlib-bindings and zlib-conduit. This caused the build to
fail. Directly depending on a working version of zlib fixes
this problem.

Reference: http://stackoverflow.com/questions/8961413/zlib-build-error-with-ghc