Hello,

> > I wonder if I need to set this up as a shared sandbox so that pandoc gets installed to the sandbox in the parent directory.  Kind of like the first example from the “Advanced usage” section of:
> >
> > http://coldwa.st/e/blog/2013-08-20-Cabal-sandbox.html
>
> Creating a shared sandbox ended up working.  I don’t know it that’s the proper way to do this kind of thing.

For the moment Benjamin's solution seems the best way to go but, just for the record, I think the command you're looking for might be `cabal sandbox add-source ./your-local-patched-pandoc/` and then `install` (see http://www.haskell.org/cabal/users-guide/installing-packages.html under "Sandboxes: Basic usage" or probably the very same article you referred to, which seems the source for the wiki).

--
Nadir