On Monday 04 April 2011 16:19:46, Gang Yu wrote:
Hi, cafe,
I always get the following build failure when I try to install encoding:
Configuring encoding-0.6.4... Warning: This package indirectly depends on multiple versions of the same package. This is highly likely to cause a compile failure. package haskell98-1.0.1.1 requires random-1.0.0.2 package HaXml-1.20.2 requires random-1.0.0.2 package random-1.0.0.2 requires time-1.1.4 package random-1.0.0.2 requires time-1.2.0.4
That looks as though you have two random-1.0.0.2 packages (and two time packages), probably one in the global package-db and one in the user-db. haskell98 depends on the one in the global db and probably HaXml depends on the one in the user-db. For some package you installed (or did you perchance run cabal upgrade?), cabal seems to have reinstalled random and time (possibly more), that's not good. Ask ghc-pkg about broken packages, $ ghc-pkg check You might need to remove packages from the user-db
[ 6 of 65] Compiling Data.Encoding.ByteSource ( Data/Encoding/ByteSource.hs, dist/build/Data/Encoding/ByteSource.o )
Data/Encoding/ByteSource.hs:151:17: Not in scope: data constructor `State'
You have mtl-2.*, but encoding would need mtl-1.* it seems, but it hasn't put an upper bound on that dependency. Notify author/maintainer.
I manually installed a ghc-6.12.3, a ubuntu ghc-6.12.1, all the same?
anybody can provide helps? thanks
To circumvent the build failure, have an mtl-1.*, but no mtl-2.* available, then it should build (or you could edit the source to replace all occurrences of the data constructor State with the function state to make it build with mtl-2.*).