Hello Alexander, please try the following: Change line 37 of leksah.cabal from: build-depends: Cabal >=1.6.0.1,... to: build-depends: Cabal ==Cabal-1.6.0.3,... or as an alternative try: runghc Setup configure --constraint="Cabal == 1.6.0.3" Jürgen Am Freitag, den 10.04.2009, 21:31 +0200 schrieb Alexander Schell: > Cabal-1.6.0.3