Others probably can answer configuring GCC for Linux/PPC better
than I, but it is looking for something like "powerpc-unknown-linux-gnu"
as the target.
rs6000 is NOT another ppc based architecture.
If you are trying to build a linuxppc compiler hosted on x86
Linux, then you need to build a cross-compiler. Please read the cross-gcc
FAQ to learn how to do this:
http://www.objsw.com/CrossGCC/
David
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