Not sure why it fails, or how to progress from here:

...
checking how to run the C preprocessor... /mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/build/./gcc/xgcc -B/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/build/./gcc/ -B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-
pc-linux-gnu/lib/ -isystem /usr/i686-pc-linux-gnu/include -isystem /usr/i686-
pc-linux-gnu/sys-include    -E
checking whether decimal floating point is supported... yes
checking whether fixed-point is supported... no
checking whether assembler supports CFI directives... yes
checking for __attribute__((visibility("hidden")))... yes
checking whether the target assembler supports thread-local storage... yes
checking whether the thread-local storage support is from emutls... no
configure: updating cache ./config.cache
configure: creating ./config.status
config.status: creating Makefile
config.status: executing default commands
make[3]: Entering directory `/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/build/i686-pc-linux-gnu/libgcc'
# If this is the top-level multilib, build all the other
/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/xgcc -
B/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/ -
B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-
pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include    -g -O2 -
march=pentium3 -pipe -O2  -g -O2 -march=pentium3 -pipe -DIN_GCC   -W -Wall -
Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -
DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -
I../.././gcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/. -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../include -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/config/libbid -
DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _muldi3.o -MT _muldi3.o 
-MD -MP -MF _muldi3.dep -DL_muldi3 -c /mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc/libgcc2.c \
  -fvisibility=hidden -DHIDE_EXPORTS
# multilibs.
/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/xgcc -
B/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/ -
B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-
pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include    -g -O2 -
march=pentium3 -pipe -O2  -g -O2 -march=pentium3 -pipe -DIN_GCC   -W -Wall -
Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -
DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -
I../.././gcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/. -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../include -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/config/libbid -
DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _negdi2.o -MT _negdi2.o 
-MD -MP -MF _negdi2.dep -DL_negdi2 -c /mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc/libgcc2.c \
  -fvisibility=hidden -DHIDE_EXPORTS
/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/xgcc -
B/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/ -
B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-
pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include    -g -O2 -
march=pentium3 -pipe -O2  -g -O2 -march=pentium3 -pipe -DIN_GCC   -W -Wall -
Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -
DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -
I../.././gcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/. -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../include -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/config/libbid -
DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _lshrdi3.o -MT 
_lshrdi3.o -MD -MP -MF _lshrdi3.dep -DL_lshrdi3 -c 
/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc/libgcc2.c \
  -fvisibility=hidden -DHIDE_EXPORTS
/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/xgcc -
B/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/ -
B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-
pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include    -g -O2 -
march=pentium3 -pipe -O2  -g -O2 -march=pentium3 -pipe -DIN_GCC   -W -Wall -
Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -
DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -
I../.././gcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/. -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../include -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/config/libbid -
DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _ashldi3.o -MT 
_ashldi3.o -MD -MP -MF _ashldi3.dep -DL_ashldi3 -c 
/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc/libgcc2.c \
  -fvisibility=hidden -DHIDE_EXPORTS
/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/xgcc -
B/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/ -
B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-
pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include    -g -O2 -
march=pentium3 -pipe -O2  -g -O2 -march=pentium3 -pipe -DIN_GCC   -W -Wall -
Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -
DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -
I../.././gcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/. -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../include -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/config/libbid -
DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _ashrdi3.o -MT 
_ashrdi3.o -MD -MP -MF _ashrdi3.dep -DL_ashrdi3 -c 
/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc/libgcc2.c \
  -fvisibility=hidden -DHIDE_EXPORTS
/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/xgcc -
B/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/ -
B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-
pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include    -g -O2 -
march=pentium3 -pipe -O2  -g -O2 -march=pentium3 -pipe -DIN_GCC   -W -Wall -
Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -
DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -
I../.././gcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/. -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../include -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/config/libbid -
DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _cmpdi2.o -MT _cmpdi2.o 
-MD -MP -MF _cmpdi2.dep -DL_cmpdi2 -c /mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc/libgcc2.c \
  -fvisibility=hidden -DHIDE_EXPORTS
/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/xgcc -
B/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/ -
B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-
pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include    -g -O2 -
march=pentium3 -pipe -O2  -g -O2 -march=pentium3 -pipe -DIN_GCC   -W -Wall -
Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -
DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -
I../.././gcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/. -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../include -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/config/libbid -
DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _ucmpdi2.o -MT 
_ucmpdi2.o -MD -MP -MF _ucmpdi2.dep -DL_ucmpdi2 -c 
/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc/libgcc2.c \
  -fvisibility=hidden -DHIDE_EXPORTS
/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/xgcc -
B/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/ -
B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-
pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include    -g -O2 -
march=pentium3 -pipe -O2  -g -O2 -march=pentium3 -pipe -DIN_GCC   -W -Wall -
Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -
DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -
I../.././gcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/. -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../include -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/config/libbid -
DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _clear_cache.o -MT 
_clear_cache.o -MD -MP -MF _clear_cache.dep -DL_clear_cache -c 
/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc/libgcc2.c \
  -fvisibility=hidden -DHIDE_EXPORTS
/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/xgcc -
B/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/ -
B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-
pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include    -g -O2 -
march=pentium3 -pipe -O2  -g -O2 -march=pentium3 -pipe -DIN_GCC   -W -Wall -
Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -
DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -
I../.././gcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/. -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../include -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/config/libbid -
DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _enable_execute_stack.o 
-MT _enable_execute_stack.o -MD -MP -MF _enable_execute_stack.dep -
DL_enable_execute_stack -c /mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc/libgcc2.c \
  -fvisibility=hidden -DHIDE_EXPORTS
/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/xgcc -
B/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/ -
B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-
pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include    -g -O2 -
march=pentium3 -pipe -O2  -g -O2 -march=pentium3 -pipe -DIN_GCC   -W -Wall -
Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -
DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -
I../.././gcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/. -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../include -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/config/libbid -
DENABLE_DECIMAL_BID_FORMAT -DHAVE_CC_TLS  -DUSE_TLS -o _trampoline.o -MT 
_trampoline.o -MD -MP -MF _trampoline.dep -DL_trampoline -c 
/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc/libgcc2.c \
  -fvisibility=hidden -DHIDE_EXPORTS
/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/xgcc -
B/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/build/./gcc/ -
B/usr/i686-pc-linux-gnu/bin/ -B/usr/i686-pc-linux-gnu/lib/ -isystem /usr/i686-
pc-linux-gnu/include -isystem /usr/i686-pc-linux-gnu/sys-include    -g -O2 -
march=pentium3 -pipe -O2  -g -O2 -march=pentium3 -pipe -DIN_GCC   -W -Wall -
Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-
style-definition  -isystem ./include  -fPIC -g -DHAVE_GTHR_DEFAULT -
DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector   -I. -I. -
I../.././gcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/. -I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../gcc -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/../include -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/libgcc/config/libbid -
DENABLE_DECIMAL_BID_FORMAT -DHAtage/sys-devel/gcc-4.6.3/work/gcc-4.6.3/gcc -
I/mnt/video/tmp_portage/portage/sys-devel/gcc-4.6.3/work/gcc-4.6.3/gcc/. -
I/mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/gcc-4.6.3/gcc/../include -
I/mnt/video/tmp_portage/portage/sys-deLIBPATH}" BOOT_CFLAGS="${BOOT_CFLAGS}" 
${GCC_MAKE_TARGET} || die "emake failed with ${GCC_MAKE_TARGET}";
 *
 * If you need support, post the output of `emerge --info '=sys-
devel/gcc-4.6.3'`,
 * the complete build log and the output of `emerge -pqv '=sys-
devel/gcc-4.6.3'`.
 *
 * Please include /mnt/video/tmp_portage/portage/sys-
devel/gcc-4.6.3/work/build/gcc-build-logs.tar.bz2 in your bug report

Any ideas?
-- 
Regards,
Mick