Integrating editline with ghc

[Christian Maeder]

Christian Maeder wrote:
> Depending on what the ghc team and the library maintainers decide,
> "readline" has to be changed to "readline-compat" in *.cabal

Maybe someone could point out how the conditional build-depends entry
would look like in Shellac-readline.cabal if readline is to be used for
older ghc versions (with GNU readline only) and readline-compat for
newer ghcs (possible using editline).

Will there be a new flag hasReadlineCompat?

Cheers C.