On Thu, 2008-08-28 at 21:34 +0200, Ben Franksen wrote: > Just some raw ideas: > > What if we had a way to express 'optional dependencies' between packages in > a cabal file. Something like 'if package x is installed (and satisfies > given version constraints) then add module UseX'. > > One problem with this idea is that I might install the missing (optional) > package afterwards, and then I still do not have the instance I would like > (unless I re-build). Could cabal be instructed to re-build a package if an > optional dependency becomes available (or if one gets removed)?
Right, requiring an order of installation is rather unfortunate. Always rebuilding things doesn't really fit well with many deployment models. Duncan _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
