Hi, many thanks to all who answered my post, I learned a lot by reading them and the referenced web pages.
> You probably have some packages of yours installed as user and some > others globally. Have a look at: > > http://www.haskell.org/cabal/FAQ.html#dependencies-conflict This explains well why I got the strange error. > I recommend that as soon as you have a running Haskell Platform to > always install new packages with cabal install ... --user This is actually what I did. But this is not fool proof (and I was here the fool), because I can still do harm by asking cabal to install packages - which get registered in the user package db - that are part of ghc - thus registered also in the global db. So I decided now to go the all global route - which is not really global as I did install ghc anyway in my own directory - so that there is only one package db. For the sake of anybody stumbling over this thread in the future, this is what I do now: # Fetch and untar both ghc and cabal-install, install ghc cd /tmp curl -O http://www.haskell.org/ghc/dist/7.0.4/ghc-7.0.4-x86_64-apple-darwin.tar.b z2 curl -O http://www.haskell.org/cabal/release/cabal-install-0.10.2/cabal-install-0 .10.2.tar.gz tar xf ghc-7.0.4-x86_64-apple-darwin.tar.bz2 tar xf cabal-install-0.10.2.tar.gz cd /tmp/ghc-7.0.4 ./configure --prefix=/Users/claudio/Haskell/GHC make install # Modify the path in bootstrap.sh for my own "global" directory # and execute it with the --global option so that all packages it # installs go to the global package db. cd /tmp/cabal-install-0.10.2 perl -i -pe 's"/usr/local"\$HOME/Haskell/GHC"' bootstrap.sh chmod u+rwx bootstrap.sh ./bootstrap.sh --global PATH=$PATH:$HOME/Haskell/GHC/bin cabal update At this point cabal has created its config file $HOME/.cabal/config which I modify so that cabal defaults to global but uses my own directory by applying these changes: $ diff -d config.orig config 31c31 < -- user-install: True --- > user-install: False 68c68 < -- prefix: /usr/local --- > prefix: /Users/claudio/Haskell/GHC claudio _______________________________________________ Haskell mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell
