Dear list, Cabal-1.10.1.0 contains a bug that causes it to fail to parse the test-suite target of bytestring-0.9.2.0. Since cabal-install parses all package descriptions to before resolving dependencies, users with that version of Cabal are stuck. Now it seems somebody realised this problem and removed bytestring-0.9.2.0 from hackage. However, 1. http://hackage.haskell.org/package/bytestring is now broken. 2. The downloadeble package index (00-index.tar) still contains the bytestring-0.9.2.0 cabal file, so the problem persists. As a workaround, one can remove the cabal file from the downloaded index manually, tar -f ~/.cabal/packages/hackage.haskell.org/00-index.tar --delete bytestring/0.9.2.0 (or rebuild Cabal / cabal-install starting with 'cabal unpack Cabal; cabal unpack cabal-install') But it really needs to be fixed on the hackage server. Best regards, Bertram