On Thu, Jul 24, 2014 at 5:09 AM, George Colpitts <george.colpitts@gmail.com> wrote:

Installed on the Mac, looks good, ...
did cabal install -j3 of threadscope, criterion, hlint, ghc-mod, quickcheck, smallcheck and smartcheck

That's all a good sign...

not sure if following is significant:

ghc-pkg check

Warning: library-dirs: /opt/local/lib/ doesn't exist or isn't a directory
Warning: include-dirs: /opt/local/include/ doesn't exist or isn't a directory
Warning: haddock-interfaces: /Users/gcolpitts/Library/Haskell/ghc-7.8.3/lib/Cabal-1.20.0.1/doc/html/Cabal.haddock doesn't exist or isn't a file

Something is amiss in how things ended up on your machine. I've just double checked the contents of the Mac distro and /opt doesn't appear in any of the package registrations. Furthermore, unless you built Cabal-1.20.0.1, it shouldn't be in your package db. My rough guess is that you've got a 7.8.3 compatible package db left over from a prior install somewhere. Can you e-mail me directly the output of:

which cabal

cabal --version
which ghc
ghc --version

which ghc-pkg

ghc-pkg --version

ghc-pkg list

ghc-pkg dump

Thanks!