I'm trying to use HTF by following this tutorial: http://hackage.haskell.org/packages/archive/HTF/0.9.0.0/doc/html/Test-Framework-Tutorial.html

and when I build the project I get the error:
ghc: could not execute: htfpp

I'm using:
$ dpkg -l | grep haskell-platform
ii  haskell-platform                                            2012.2.0.0ubuntu1                         all          Standard Haskell libraries and tools

What am I doing wrong?

Thanks,
ovidiu