WARNING in hptSomeThingsBelowUs

[Ben Franksen]

This is what I get after removing a file from the working tree and also
from the cabal file for the project and then rebuild.

WARNING in hptSomeThingsBelowUs
  missing module Darcs.Util.Environment
  Probable cause: out-of-date interface files

I am using cabal new-build. Cabal folks tell me this is a ghc problem. I
am using ghc-7.10.3.

Cheers
Ben