I think this is mentioned in src/UPDATING - you need to rebuild gas.

On 14 Jan 2002, Zach Hartley wrote:

> Hi,
>
> While trying to compile GENERIC on -current (gotten from
> ftp.netbsd.org/pub/NetBSD-current/tar_files , which seeminly are from
> last saturday) make fails with the following errors spitten out:
>
> <snip>
> cc -ffreestanding -O2 -Werror -Wall -Wno-main -Wpointer-arith
> -Wmissing-prototypes -Wstrict-prototypes -Wno-uninitialized -Di386 -I,
> -I../../../../arch -I../../../.. -nostdinc -DLKM -DMAXUSERS=32 -D_KERNAL
> -D_KERNAL_OPT -c ../../../../arch/i386/isa/npx.c
> /tmp/ccaaESeX.s: Assembler messages:
> /tmp/ccaaESeX.s:317: Error: no such 386 instruction: 'fxsave'
> /tmp/ccaaESeX.s:412: Error: no such 386 instruction: 'fxsave'
> /tmp/ccaaESeX.s:451: Error: no such 386 instruction: 'fxrstor'
> /tmp/ccaaESeX.s:487: Error: no such 386 instruction: 'fxsave'
> /tmp/ccaaESeX.s:571: Error: no such 386 instruction: 'fxsave'
> *** Error Code 1
>
> Stop.
>
> any ideas?
>
> --
> Zachary Todd Hartley
> "Attempted murder. Now honestly, what is that?
> Do they give a Nobel Prize for attempted chemistry?"
> 	--Sideshow Bob
>

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