Martin Huschenbett
$ cabal install ghci-haskeline Resolving dependencies... cabal.exe: dependencies conflict: ghc-6.10.1 requires process ==1.0.1.1 however process-1.0.1.1 was excluded because ghc-6.10.1 requires process ==1.0.1.0
cabal uninstall process-1.0.1.1 is what you want to do, and never, ever[1] use cabal upgrade. If you're interested in the gory details and why it's a bug while at the same time not being one, there's a lengthy thread starting with http://permalink.gmane.org/gmane.comp.lang.haskell.cafe/51759 [1] Until cabal becomes smarter -- (c) this sig last receiving data processing entity. Inspect headers for copyright history. All rights reserved. Copying, hiring, renting, performance and/or quoting of this signature prohibited.