On Tuesday 05 April 2011 20:25:36, Tom Murphy wrote:
Hi all,
I'm having build troubles with Happstack. I'll let the error message speak for itself:
" $ export PATH=~/.cabal/bin:$PATH $ cabal update $ cabal install happstack Resolving dependencies... cabal: cannot configure unix-2.4.2.0. It requires base >=4.2 && <4.4 For the dependency on base >=4.2 && <4.4 there are these packages: base-4.2.0.0, base-4.2.0.1, base-4.2.0.2, base-4.3.0.0 and base-4.3.1.0. However none of them are available. base-4.2.0.0 was excluded because of the top level dependency base -any base-4.2.0.1 was excluded because of the top level dependency base -any base-4.2.0.2 was excluded because of the top level dependency base -any base-4.3.0.0 was excluded because of the top level dependency base -any base-4.3.1.0 was excluded because of the top level dependency base -any "
Yes, that error message is terrible. What it means is that for some reason, cabal can't choose any of these versions. However, it's suspicious that it tries to install unix-2.4.2.0 at all. You should have a unix package installed that came with your ghc, and that should be used. Have you any packages in your user-db which shadow packages in the global db? What does ghc-pkg check report, and what does $ cabal install -v3 --dry-run happstack say?
Thank you for any help! Tom