When installing package haskell-src-exts via cabal install, I get the errorLanguage/Haskell/Exts/Syntax.hs:102:7:Could not find module `Data.Data':it is a member of package base, which is hiddenHowever, when manually installingrunhaskell Setup.hs configure/build/installIt works fineSomehow package base is not available in cabal.. don't know why.