darcs patch: [PROOF OF CONCEPT] build readline package with libedit

[Christian Maeder]

Simon Marlow wrote:
> Judah Jacobson wrote:
>> I've actually put together a readline-compat package like you described:
>>
>> http://code.haskell.org/readline-compat
> 
> This is not the way to go, IMO.  As Manuel said, we don't want packages
> with licenses that depend on the way the package is built.  The
> readline-compat package above has this problem, and the only way to fix
> it is to make its license GPL.  But presumably that's exactly what you
> don't want to do, because the purpose of using editline is to avoid the
> GPL.

My major aim was to avoid that users of our software need to install the
GNUReadline.framework (or libreadline) on their macs (although we could
probably also link libreadline and libncurses statically.)

> Packages which want to use either editline or readline should say so in
> their .cabal files, we cannot abstract this choice into a package of its
> own.

You also abstract the choice between windows and unix. Doesn't that have
license implications, too?

Cheers Christian