Well, I think this is a reasonable workaround for the "minor" half of one of these version splitting packages -- I still think we should downgrade to parsec 2 -- since that's what the haskell platform ships with.
Now, when we do that, there are a few thiings that need >= parsec 3. For those, some new logic in cabal2arch got get them building.
We may just be able to get authors to move though, with more direct calls to stop using non-preferred versions of things.
-- Don
If it's possible to install multiple versions of a package with cabal-install, wouldn't it be possible to create pacman packages which install multiple versions as well? From an outsider's perspective I realize that this may be an ignorant question, but considering the seeming chaos surrounding haskell packages lately and the seeming lack of adherence to uniform standards, perhaps it would be simpler to provide a "parsec" package which contains parsec 2 and parsec 3. Such an approach, if possible, would also prevent headaches from other suggested solutions, such as making different versions of the same package available in the official repos and the AUR. You could use the provides array to specify exactly which packages are provided by a mutli-version package and encourage all haskell packagers to include versions in their depends and makedepends arrays. I haven't tested it but it should be possible to have something along the lines of the following in a depends array: depends=('haskell-parsec>=2' 'haskell-parsec<3') The merged package could then provide e.g. ('haskell-parsec=2.4' haskell-parsec=3.1'). This would create explicit dependency trees which would prevent mismatch breakage while simultaneously enabling the provision of all popular versions of packages, even when those versions are not part of the current platform. Sorry if this is blatantly a bad idea and/or impossible. I'm just thinking out loud. I suspect that the feasibility of this approach depends on how multiple versions of the same package are handled by cabal-install, and I have no idea how they are. Regards, Xyne