Compiling a C++ program for AMD64

[Stefano Simonucci <stefano.simonucci@tin.it>]

I have tried to compile a C++ program for an AMD64.
The command for the compilation was:

g++ -march=athlon -m64 -c Scattdf.cc

Then I get this error message:

cc1plus: sorry, unimplemented: 64-bit mode not compiled in

The compiler version is the following

stefano@debsim:/usr/src$ dpkg -s g++
Package: g++
Status: install ok installed
Priority: standard
Section: devel
Installed-Size: 8
Maintainer: Debian GCC maintainers <debian-gcc@lists.debian.org>
Source: gcc-defaults (1.14)
Version: 4:3.3.3-2
Provides: c++-compiler

Thank you
                  Stefano Simonucci