On Thu, Jul 24, 2014 at 5:09 AM, George Colpitts 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!