[Hat] problem. Installing hat with GHC version 6.2.1

Hi, I'm trying to install hat on with ghc 6.2.1. under linux. During the execution of the ./configure script, I'm getting this error message: Looking for already-installed Haskell compilers: Looking for ghc... found 6.2.1 WARNING: hat-2.02 needs a version of ghc >= 5.04. Looking for nhc98... (not found) Looking for hmake... found 3.08 ERROR: hat needs at least one of ghc or nhc98 Hmmm, strange. He founds ghc 6.2.1 and hat needs 5.04, but why is he complaining?? What is wrong here? Thanks in advance, Tom