As far as I am aware, the AMD Duron (unlike the Opteron) is a 32-bit CPU. So anything specific to 64-bit CPUs will not work.
If memory serves, the Duron is treated as a K7 architecture, which is call-compatible with the i686 (or i586 i486 or i386 if you're desperate) by the GCC compiler.
No doubt someone will point out some mistakes in the above.
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