Hi, From a clean install of Haskell Platform 2012.4.0.0 (on Windows) I have issued just:
cabal update cabal install cabal-install cabal install cabal-dev
The last command fails with: Resolving dependencies... In order, the following would be installed: tar-0.3.2.0 (new package) transformers-0.2.2.0 (new version) mtl-2.0.1.0 (new version) parsec-3.1.3 (reinstall) changes: mtl-2.1.2 -> 2.0.1.0 network-2.3.2.0 (new version) HTTP-4000.2.8 (new version) cabal-dev-0.9.1 (new package) cabal: The following packages are likely to be broken by the reinstalls: network-2.3.1.0 haskell-platform-2012.4.0.0 cgi-3001.1.7.4 HTTP-4000.2.5 Use --force-reinstalls if you want to install anyway. I *think* the problem is that cabal-dev has these dependencies: mtl >= 1.1 && < 2.1, transformers >= 0.2 && < 0.3, where the latest version of mtl and transformers are 2.1.2 and 0.3 respectively. At least, if I download the latest cabal-dev package and relax those upper bounds I can get it to install. The irony is, of course, that I'm trying to install cabal-dev to get me out of a totally unrelated dependencies hole! What should I do now? Cheers, -- David Turner Senior Consultant Tracsis PLC Tracsis PLC is a company registered in England and Wales with number 5019106.