> > /tmp/cc5rNAyk.s:317: Error: no such 386 instruction: `fxsave'
>
> This is a known problem. What /usr/src/UPDATING is saying:
>
> 20010803:
> 	(i386 only): i386 kernel now uses new instructions like
>         `fxsave' which old gas doesn't understand.  To build the
> 	kernel successfully, you need to build and install new gas
> 	(gnu/usr.bin/gas.new), or (temporarily) comment out
> 	"options I686_CPU" from your kernel configuration until you
> 	rebuilt your userland (and got a new gas).

...and to build gas.new, you probably need to build a new libbfd from
gnu/lib/libbfd.

- H=E5vard