Libraries Digest, Vol 87, Issue 16

John Lato jwlato at
Tue Nov 9 05:40:26 EST 2010

On Mon, Nov 8, 2010 at 7:46 PM, Matthias Kilian <kili at>wrote:

> Hi,
> On Mon, Nov 08, 2010 at 06:58:52PM +0000, Duncan Coutts wrote:
> > >>
> > >
> > > Well, the policy can be changed if necessary (not that I'm proposing
> that
> > > here).
> > > While packages may need to be present to build an application in the
> > > platform, they don't necessarily need to be exposed as part of the
> platform.
> >
> > That's true for binary packaging systems. It would not be true for
> > source based ones e.g. gentoo, freebsd ports, macports or indeed
> > someone starting with just ghc and using cabal to install the platform
> > meta-package.
> On the other hand, on those systems people would get all packages
> (libraries and programs) required by the Haskell platform, plus
> some additional ones. Wouldn't hurt too much, IMHO (allthough it
> feels a little bit wrong if the platform would contain programs
> that can't be built with only the platform).

I think this was exactly the situation rationale 8.5 means to avoid.

I do think it would be technically possible to make this work, but only by
greatly increasing the maintenance cost for HP (I underestimated this cost
originally).  It's probably not a good trade-off.  If cabal supported
something like run-time-specified repos it would be much simpler.

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