On Thu, Oct 31, 2013 at 1:18 PM, Erik de Castro Lopo <mle+hs@mega-nerd.com> wrote:
Badi' Abdul-Wahid wrote:

> I've run into difficulty building happy and alex using the sandbox feature
> of cabal-install 1.18.0.2.
> Installation of dependencies succeeds but both happy and alex fail with:
>
>     setup: The program happy is required but it could not be found
>
> My workaround is to use the --only-dependencies flag, install the
> dependencies, and manually install the packages.

I've run into this problem myself on Linux. My solution is to install
ghc, happy, alex, hlint and cabal-install from debian packages and
everything else using cabal install (either with or without using
sandboxes).

At a guess, both of you need to find the bin directory created *in the sandbox* and add it to $PATH while working in the sandbox. Perhaps there is some better way for cabal sandboxes to handle this automatically.

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