make buildworld error

[Gert Cuykens]

...
cd /usr/src/etc; make buildincludes; make installincludes
===> etc/sendmail
===> etc/sendmail

--------------------------------------------------------------
>>> stage 4.2: building libraries
--------------------------------------------------------------
cd /usr/src;  MAKEOBJDIRPREFIX=/usr/obj  MACHINE_ARCH=amd64 
MACHINE=amd64  CPUTYPE=amd64 
GROFF_BIN_PATH=/usr/obj/usr/src/amd64/legacy/usr/bin 
GROFF_FONT_PATH=/usr/obj/usr/src/amd64/legacy/usr/share/groff_font 
GROFF_TMAC_PATH=/usr/obj/usr/src/amd64/legacy/usr/share/tmac 
_SHLIBDIRPREFIX=/usr/obj/usr/src/amd64  INSTALL="sh
/usr/src/tools/install.sh" 
PATH=/usr/obj/usr/src/amd64/legacy/usr/sbin:/usr/obj/usr/src/amd64/legacy/usr/bin:/usr/obj/usr/src/amd64/legacy/usr/games:/usr/obj/usr/src/amd64/usr/sbin:/usr/obj/usr/src/amd64/usr/bin:/usr/obj/usr/src/amd64/usr/games:/sbin:/bin:/usr/sbin:/usr/bin
make -f Makefile.inc1 DESTDIR=/usr/obj/usr/src/amd64 -DNOFSCHG
-DNOHTML -DNOINFO -DNOLINT -DNOMAN -DNOPROFILE  libraries
cd /usr/src;  make -f Makefile.inc1 _startup_libs;  make -f
Makefile.inc1 _prebuild_libs;  make -f Makefile.inc1 _generic_libs;
===> gnu/lib/csu
make -f /usr/src/gnu/lib/csu/../../usr.bin/cc/cc_tools/Makefile
MFILE=/usr/src/gnu/lib/csu/../../usr.bin/cc/cc_tools/Makefile
GCCDIR=/usr/src/gnu/lib/csu/../../../contrib/gcc tconfig.h
echo '#ifndef GCC_TCONFIG_H'                    > tconfig.h
echo '#define GCC_TCONFIG_H'                    >> tconfig.h
echo '#ifdef IN_GCC'                            >> tconfig.h
echo '# include "ansidecl.h"'                   >> tconfig.h
echo '#endif'                                   >> tconfig.h
echo '#define USED_FOR_TARGET'                  >> tconfig.h
echo '#endif /* GCC_TCONFIG_H */'               >> tconfig.h
make -f /usr/src/gnu/lib/csu/../../usr.bin/cc/cc_tools/Makefile
MFILE=/usr/src/gnu/lib/csu/../../usr.bin/cc/cc_tools/Makefile
GCCDIR=/usr/src/gnu/lib/csu/../../../contrib/gcc tm.h
echo '#ifndef GCC_TM_H'                         > tm.h
echo '#define GCC_TM_H'                         >> tm.h
echo '#ifdef IN_GCC'                            >> tm.h
echo '#include "i386/biarch64.h"'                               >> tm.h
echo '#include "i386/i386.h"'                           >> tm.h
echo '#include "i386/unix.h"'                           >> tm.h
echo '#include "i386/att.h"'                            >> tm.h
echo '#include "dbxelf.h"'                              >> tm.h
echo '#include "elfos.h"'                               >> tm.h
echo '#include "freebsd-native.h"'                              >> tm.h
echo '#include "freebsd-spec.h"'                                >> tm.h
echo '#include "freebsd.h"'                             >> tm.h
echo '#include "i386/freebsd.h"'                                >> tm.h
echo '#include "i386/x86-64.h"'                         >> tm.h
echo '#include "i386/freebsd64.h"'                              >> tm.h
echo '#include "freebsd64-fix.h"'                               >> tm.h
echo '#include "defaults.h"'                            >> tm.h
echo '#if !defined GENERATOR_FILE && !defined USED_FOR_TARGET' >> tm.h
echo '# include "insn-constants.h"'             >> tm.h
echo '# include "insn-flags.h"'                 >> tm.h
echo '#endif'                                   >> tm.h
echo '#endif'                                   >> tm.h
echo '#define EXTRA_MODES_FILE "i386/i386-modes.def"' >> tm.h
echo '#endif /* GCC_TM_H */'                    >> tm.h
rm -f .depend
mkdep -f .depend -a -DCRT_BEGIN   -DIN_GCC -DHAVE_LD_EH_FRAME_HDR
-I/usr/src/gnu/lib/csu/../../../contrib/gcc/config
-I/usr/src/gnu/lib/csu/../../../contrib/gcc -I.
-I/usr/src/gnu/lib/csu/../../usr.bin/cc/cc_tools
/usr/src/gnu/lib/csu/../../../contrib/gcc/crtstuff.c
cc -O -pipe -march=amd64 -DIN_GCC -DHAVE_LD_EH_FRAME_HDR
-finhibit-size-directive -fno-inline-functions  -fno-exceptions
-fno-zero-initialized-in-bss  -fno-omit-frame-pointer
-fno-unit-at-a-time -I/usr/src/gnu/lib/csu/../../../contrib/gcc/config
-I/usr/src/gnu/lib/csu/../../../contrib/gcc -I. 
-I/usr/src/gnu/lib/csu/../../usr.bin/cc/cc_tools  -g0 -DCRT_BEGIN  -c
-o crtbegin.o /usr/src/gnu/lib/csu/../../../contrib/gcc/crtstuff.c
/usr/src/gnu/lib/csu/../../../contrib/gcc/crtstuff.c:1: error: bad
value (amd64) for -march= switch
/usr/src/gnu/lib/csu/../../../contrib/gcc/crtstuff.c:1: error: bad
value (amd64) for -mtune= switch
*** Error code 1

Stop in /usr/src/gnu/lib/csu.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
7rxI#

how do i fix this ?