trouble with Debian package ghc5

[Norman Ramsey]

 > However, it seems you are right: whenever _some_ ghc package needs
 > util, it will implicitly depend on libreadline being installed, even
 > if readline is never really linked to.
 > 
 > So, what can be done?
 > 
 > The hot-fix is to install libreadline4-dev.

Done.  Works.   Thanks.

 > I _could_ make readline a hard dependency of ghc, but this is somehow
 > not satisfactory.  I'd rather like readline to be out-factored to its
 > own package (I know, this would break other Haskell programs, but it's
 > arguably easy-to-fix breakage...).
 > 
 > Comments?

For a newbie like me, it would be useful to have a `virtual' package
ghc-util for `ghc programs that need util'.  This could then require
libreadline4-dev.  The key is that something show up in 
  dpkg --list ghc*
Otherwise the need for libreadline4-dev is not obvious to the amateur.


Norman