Resolving dependencies... Downloading ghc-paths-0.1.0.3... Configuring ghc-paths-0.1.0.3... Failed to install ghc-paths-0.1.0.3 Build log ( /home/builder/.cabal/logs/ghc-paths-0.1.0.3.log ): cabal: Entering directory '/tmp/cabal-tmp-28893/ghc-paths-0.1.0.3' cabal: Leaving directory '/tmp/cabal-tmp-28893/ghc-paths-0.1.0.3' cabal: Error: some packages failed to install: ghc-paths-0.1.0.3 failed during the configure step. The exception was: user error ('/opt/ghc/8.0.2/bin/ghc' exited with an error: /tmp/cabal-tmp-28893/ghc-paths-0.1.0.3/dist/setup/setup.hs:8:1: error: Failed to load interface for ‘Distribution.Simple.PackageSet’ Perhaps you meant Distribution.Simple.PackageIndex (from Cabal-1.24.0.0) Distribution.Simple.Configure (from Cabal-1.24.0.0) Distribution.Simple.HaskellSuite (from Cabal-1.24.0.0) Use -v to see a list of the files searched for. )