I am trying to compile ghc on my powermac (debian 3.0) apt-get source ghc5 succeed, but to do the actual compilation, it need a working ghc (and there is no binary package in the list)

How can I get a (even old) working ghc ?

I'm afraid we don't have a port for your system at the moment. Furthermore the road to porting GHC is long and tortuous :-( We do have a port for Macs running Darwin, however I'm guessing that's quite different to Debian (Darwin has Apple's special version of GCC for one thing). Check out the GHC porting instructions for more details: http://www.haskell.org/ghc/docs/latest/building/sec-porting-ghc.html Cheers, Simon