Getting errors upon using "upgrade outdated"

[TheTanster (Kok-Yong Tan)]

I'm getting the following errors which I suspect are associated with the Haskell package due to the "hs-" prefixes but I don't know how to fix them:

perses:~ kytan$ sudo port upgrade outdated
Password:
Nothing to upgrade.
---> Scanning binaries for linking errors
---> Found 4 broken files, matching files to ports
Warning: No port hs-cabal-install found in the index; can't rebuild
Warning: No port hs-alex found in the index; can't rebuild
Warning: No port hs-happy found in the index; can't rebuild
Warning: No port hs-hscolour found in the index; can't rebuild
---> Broken files found, but all associated ports are not in the index and so cannot be rebuilt.