lang/gcc not build

[Alexander Panyushkin]

uname
FreeBSD 10.0-ALPHA2 #0 r255833M: Tue Sep 24 10:21:04 EEST 2013
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make.conf
CFLAGS= -O2 -march=athlon64-sse3 -mtune=athlon64-sse3 -pipe
-Qunused-parameter -Wformat -Wformat-security
CPPFLAGS+= -D_FORTIFY_SOURCE=2
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Checking multilib configuration for libgcc...
mkdir x86_64-portbld-freebsd10.0
mkdir x86_64-portbld-freebsd10.0/libgcc
Configuring in x86_64-portbld-freebsd10.0/libgcc
configure: creating cache ./config.cache
checking for --enable-version-specific-runtime-libs... no
checking for a BSD-compatible install... /usr/bin/install -c -o root -g
wheel
checking for gawk... /usr/bin/awk
checking build system type... x86_64-portbld-freebsd10.0
checking host system type... x86_64-portbld-freebsd10.0
checking for x86_64-portbld-freebsd10.0-ar...
/usr/local/x86_64-portbld-freebsd10.0/bin/ar
checking for x86_64-portbld-freebsd10.0-lipo... lipo
checking for x86_64-portbld-freebsd10.0-nm...
/usr/ports/lang/gcc/work/build/./gcc/nm
checking for x86_64-portbld-freebsd10.0-ranlib...
/usr/local/x86_64-portbld-freebsd10.0/bin/ranlib
checking for x86_64-portbld-freebsd10.0-strip...
/usr/local/x86_64-portbld-freebsd10.0/bin/strip
checking whether ln -s works... yes
checking for x86_64-portbld-freebsd10.0-gcc...
/usr/ports/lang/gcc/work/build/./gcc/xgcc
-B/usr/ports/lang/gcc/work/build/./gcc/
-B/usr/local/x86_64-portbld-freebsd10.0/bin/
-B/usr/local/x86_64-portbld-freebsd10.0/lib/ -isystem
/usr/local/x86_64-portbld-freebsd10.0/include -isystem
/usr/local/x86_64-portbld-freebsd10.0/sys-include
checking for suffix of object files... configure: error: in
`/usr/ports/lang/gcc/work/build/x86_64-portbld-freebsd10.0/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
[...]
===> Compilation failed unexpectedly.
Try to set MAKE_JOBS_UNSAFE=yes and rebuild before reporting the failure to
the maintainer.
*** Error code 1

Stop.
make[1]: stopped in /usr/ports/lang/gcc
*** Error code 1