Hi, how do I have to configure my gcc, if I want to use the -m64 compile-switch? I tried this: ../gcc-3.4.3/configure --prefix=/usr/local/gcc-3.4.3 --with-cpu=athlon64 make bootstrap but that is the result: gcc -m64 bla.c bla.c: sorry, unimplemented: 64-bit mode not compiled in What can I do? Thanks Nico