I have a dual Opteron w/ AMD-8111 chipset, I need help (a mini-howto) on
how to compile my kernel (2.4.23 on Slack 8.1 and 9.1), and later some
utilities, to support the full 64-bit of the CPUs.

Can I use the standard gcc, or do I have to create a cross-compiler for
the x86_64? If so, anyone know how to do this in Slack?