cabal: cannot configure show-0.3.4. It requires QuickCheck <2 For the dependency on QuickCheck <2 there are these packages: QuickCheck-1.0, QuickCheck-1.1.0.0 and QuickCheck-1.2.0.0. However none of them are available. QuickCheck-1.0 was excluded because tagsoup-0.8 requires QuickCheck ==2.1.* QuickCheck-1.1.0.0 was excluded because tagsoup-0.8 requires QuickCheck ==2.1.* QuickCheck-1.2.0.0 was excluded because tagsoup-0.8 requires QuickCheck ==2.1.*