error compiling 2.4.1-pre3

[Pau]

gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes -O2
-fomit-frame-pointer -fno-strict-aliasing -pipe
-mpreferred-stack-boundary=2 -march=i686 -DMODULE -DMODVERSIONS -include
/usr/src/linux/include/linux/modversions.h   -DEXPORT_SYMTAB -c xor.c
In file included from /usr/src/linux/include/linux/raid/md.h:51,
                 from xor.c:22:
/usr/src/linux/include/linux/raid/md_k.h: In function `pers_to_level':
/usr/src/linux/include/linux/raid/md_k.h:39: warning: control reaches end
of non-void function
xor.c: In function `calibrate_xor_block':
xor.c:118: `HAVE_XMM' undeclared (first use in this function)
xor.c:118: (Each undeclared identifier is reported only once
xor.c:118: for each function it appears in.)
{standard input}: Assembler messages:
{standard input}:8: Warning: Ignoring changed section attributes for
.modinfo
make[2]: *** [xor.o] Error 1
make[2]: Leaving directory `/usr/src/linux/drivers/md'
make[1]: *** [_modsubdir_md] Error 2
make[1]: Leaving directory `/usr/src/linux/drivers'
make: *** [_mod_drivers] Error 2

 Pau