[Haskell-cafe] Setting up cabal on EC2

[Lyndon Maydwell]

Many thanks to the Cabal devs :-)

On Sat, Apr 2, 2011 at 7:12 PM, Daniel Fischer
<daniel.is.fischer at googlemail.com> wrote:
> On Saturday 02 April 2011 11:51:03, Lyndon Maydwell wrote:
>> The version of cabal-install on this page seems to be out of date:
>> http://www.haskell.org/cabal/download.html
>
> So-so. Probably the majority of users are still on ghc-6.*, for them, 0.8.2
> is the right choice. The page should have two links, one for ghc-6 and one
> for ghc-7, but I guess the Cabal cabal is too busy doing more important
> things (like writing code) to always think of updating the web-page.
>
>>
>> Luckily the other releases are listed at
>> http://www.haskell.org/cabal/release.
>>
>> This seems to have solved my issue.
>
> Good.
> Just a tip, generally, it's easier to get stuff from hackage,
> http://hackage.haskell.org/package/cabal-install
> in this case.
> You can see the dependencies listed there, and see what version fits best
> with what you have. If something depends on an older version of a library
> than you have, that's a bad sign. If something depends on a newer version
> of time, process, directory, random (a couple of others, basically what ghc
> itself was built with), that's a bad sign too.
> When in doubt,
> $ cabal install whatever --dry-run
> If that says it would install a library you already have, be careful, that
> may introduce the dreaded diamond dependency problem.
>