This has been recently reported as https://github.com/tensorflow/haskell/issues/180 -- I've done a bit of analysis there, but it's not obvious what to do about it.

On Thu, May 17, 2018 at 3:36 AM Francesco Ariis <fa-ml@ariis.it> wrote:
On Thu, May 17, 2018 at 12:17:29PM +0200, Fabien R wrote:
> On 16/05/18 18:54, Vanessa McHale wrote:
> > `cabal new-build` should only rebuild things once, however. And it's
> > generally better.
> Ok. I have another error now:

Try `cabal update` and run it again, if that fails file a bug in:

    https://github.com/tensorflow/haskell

I see there are five pull-requests open, three of them older than
a year; hopefully the repo has not been google'd.


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