[Haskell-cafe] problem with editline install

i tried to install editline (because i wanted to install djinn, which depends on it): with cabal install and with downloading and runghc Setup.lhs configure i got the same error: checking for completion_matches... no configure: error: editline not found, so this package cannot be built See `config.log' for more details. in the log i did not see anything helpful (at my level of understanding). i could then install with synaptic because a deb package existed for ubuntu). what did i wrong? thanks for helpful comments andrew ps. in this case a wiki would have been helpful. it would have been a less intruding form to communicate than sending an email to the developer. especially in the case i assume i made some error.