Here was my first try to install cabal-dev (to follow advice to vacate cabal install); C:\Users\ haskell >cabal install cabal-dev Resolving dependencies... In order, the following would be installed: tar-0.3.2.0 (new package) transformers-0.2.2.0 (reinstall) changes: base-4.3.1.0 -> 4.5.0.0 mtl-2.0.1.0 (reinstall) changes: base-4.3.1.0 -> 4.5.0.0 parsec-3.1.3 (reinstall) changes: mtl-2.1.2 -> 2.0.1.0 network-2.3.0.14 (new version) HTTP-4000.2.3 (reinstall) changes: mtl-2.1.1 -> 2.0.1.0, network-2.3.0.13 -> 2.3.0.14, parsec-3.1.2 -> 3.1.3 cabal-dev-0.9.1 (new package) cabal: The following packages are likely to be broken by the reinstalls: regex-base-0.93.2 regex-posix-0.95.1 regex-compat-0.95.1 haskell-platform-2011.3.0.0 regex-posix-0.94.4 regex-compat-0.93.1 haskell-platform-2011.2.0.1 parsec-3.1.1 network-2.3.0.5 cgi-3001.1.7.4 HTTP-4000.1.2 network-2.3.0.2 vcgi-3001.1.7.4 HTTP-4000.1.1 fgl-5.4.2.4 fgl-5.4.2.3 QuickCheck-2.4.0.1 haskell-platform-2012.2.0.0 Use --force-reinstalls if you want to install anyway. The force resultted in the previously reported error - Configuring network-2.3.0.14... cabal: The package has a './configure' script. This requires a Unix compatibility toolchain such as MinGW+MSYS or Cygwin. cabal: Error: some packages failed to install: HTTP-4000.2.3 depends on network-2.3.0.14 which failed to install. cabal-dev-0.9.1 depends on network-2.3.0.14 which failed to install. network-2.3.0.14 failed during the configure step. The exception was: ExitFailure 1 Now after the attempt to do the force (which was advised earlier to resolve package shadowing problems left over from cabal-install's), C:\Users\haskell>cabal install cabal-dev Resolving dependencies... In order, the following would be installed: network-2.3.0.14 (new version) HTTP-4000.2.3 (reinstall) changes: mtl-2.1.1 -> 2.0.1.0, network-2.3.0.13 -> 2.3.0.14, parsec-3.1.2 -> 3.1.3 cabal-dev-0.9.1 (new package) cabal: The following packages are likely to be broken by the reinstalls: haskell-platform-2012.2.0.0 Use --force-reinstalls if you want to install anyway. And yes, I do have network installed;
network-2.3.0.13
-----Original Message----- Oh, I was assuming you already had a version of 'network' installed that came with the Haskell Platform - the platform comes with:
network-2.3.0.13 HTTP-4000.2.3
So I assumed they were being installed again because of the flag.
Really, the platform comes with everything that cabal-dev depends on, so it might be easier to solve whatever error message you're getting without the '--force' flag.