Hi, GHC 7.4.1 can't build wxHaskell. This problem is caused by Num class change and TypeSynonymInstances extension's change.
http://www.haskell.org/ghc/docs/7.4.1/html/users_guide/release-7-4-1.html#id3013571 http://www.haskell.org/ghc/docs/7.4.1/html/users_guide/release-7-2-1.html#id3003826 http://sourceforge.net/mailarchive/forum.php?thread_name=CAH55dvPCswVggNV0gGQS2CQftUHHKxouqTnxyE4WQ_qc-b0Ofg%40mail.gmail.com&forum_name=wxhaskell-devel I made patch to fix this problem. Attached patch also include two more changes. I relaxed time and array package's dependency to use GHC 7.4.1 bundled version instead of installing from HackageDB. And I commented out wxcore/Setup.hs' unused ver variable to fix builing with my environment. http://sourceforge.net/mailarchive/message.php?msg_id=28649050 Best Regards, -- shelarcy <shelarcy hotmail.co.jp> http://page.freett.com/shelarcy/
fix-ghc-7.4.1.dpatch
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