It looks like the bytestring-class package has not been updated in a long time (since 2009) and does not compile under the latest versions of GHC. -Brent On Mon, Jan 21, 2013 at 08:43:17PM +0100, miro wrote:

Hi, please,....I'm trying to install one package (neo4j-haskell-http-client) and below is the error I'm getting. Pls. any ideas how can I fix that?

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1 of 1] Compiling Data.ByteString.Class ( Data/ByteString/Class.hs, dist/build/Data/ByteString/Class.o )

Data/ByteString/Class.hs:39:10: Illegal instance declaration for `StrictByteString String' (All instance types must be of the form (T a1 ... an) where a1 ... an are *distinct type variables*, and each type variable appears at most once in the instance head. Use -XFlexibleInstances if you want to disable this.) In the instance declaration for `StrictByteString String'

Data/ByteString/Class.hs:55:10: Illegal instance declaration for `LazyByteString String' (All instance types must be of the form (T a1 ... an) where a1 ... an are *distinct type variables*, and each type variable appears at most once in the instance head. Use -XFlexibleInstances if you want to disable this.) In the instance declaration for `LazyByteString String' Updating documentation index /Users/miro/Library/Haskell/doc/index.html cabal: Error: some packages failed to install: bytestring-class-0.0.0 failed during the building phase. The exception was: ExitFailure 1 neo4j-haskell-0.4.1 depends on bytestring-class-0.0.0 which failed to install.

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cheers, m.

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