Hello Xavier,

you are right man!
Tried to compile httrack-3.31-TEST-1.tar.gz under Panther with Xcode 
and it worked out of the box. No compiler flags were needed anymore.

Thank you!

A little hint for all fink users out there trying not packed software:
I used
./configure --prefix=/opt/httrack
this ensures that you can easily remove httrack for a newer better 
version! ;-)

Greetings
Hendrik