haskell example problems

[JakeWheat]

Hello, I'm trying to use the haskell example:

cd tests/simple-hs ghc Shakefile.hs ./Shakefile touch Utility.hs ./Shakefile

error is:

Shakefile: Error in rule definition: A rule promised to yield the files /home/jake/wd/openshake/openshake/tests/simple-hs/Utility.o and /home/jake/wd/openshake/openshake/tests/simple-hs/Utility.hi in the process of building Utility.o, but the files /home/jake/wd/openshake/openshake/tests/simple-hs/Utility.hi have been independently built by someone else