I was using "cabal install aeson" and "cabal install http-enumerator". Running the combined command fixed the issue. I'd forgotten that cabal allows for it.

Is this necessary because of mutual dependencies? With the Platform installation of cabal, I could run cabal install for each package and everything would work fine. What's the difference?

Best,
Mike S Craig
(908) 328 8030


On Mon, Sep 12, 2011 at 4:46 PM, Antoine Latter <aslatter@gmail.com> wrote:
On Mon, Sep 12, 2011 at 3:34 PM, Michael Craig <mkscrg@gmail.com> wrote:
> I'm trying to install aeson and http-enumerator on an otherwise fresh
> installation of ghc 7.2 on OS X 10.7. I was inspired by beastaugh's gist on
> getting cabal-install running on Lion: https://gist.github.com/1169332.
> I can install either aeson or http-enumerator and it'll work fine. However,
> as soon as I install the second one the first one disappears. The files are
> all there in .cabal/lib, but ghc can't find the module.
> Any ideas?
>

What command are you using to install these, specifically?

What does the following do:

> cabal install aeson http-enumerator

Thanks,
Antoine

> Mike S Craig
>
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