Hello,
many thanks for your advice. I downloaded "httrack-3.23.20"
and was able to compile and install it successfully.
Afterwards libhttrack-dev was on my system I was able to
compile and install khttrack-0.9. Configuring khttrack-0.10
was also successul, the make process however ended with the
error "aclocal-1.4' is needed, and you do not seem to have
it handy on your system." Since this packet is not offered
by Debians apt, I'll have to get that somewhere else.

Greets
Michael