lang/gcc not build

#portmaster lang/gcc
[...]
cd /usr/ports/lang/gcc/work/gcc-4.6.4 ; contrib/gcc_update --touch
configure: loading site script /usr/ports/Templates/config.site
checking build system type... x86_64-portbld-freebsd10.0
checking host system type... x86_64-portbld-freebsd10.0
checking target system type... x86_64-portbld-freebsd10.0
checking for a BSD-compatible install... /usr/bin/install -c -o root -g 
wheel
checking whether ln works... yes
checking whether ln -s works... yes
checking for a sed that does not truncate output... (cached) /usr/bin/sed
checking for gawk... (cached) /usr/bin/awk
checking for gcc... gcc46
checking for C compiler default output file name...
configure: error: in `/usr/ports/lang/gcc/work/build':
configure: error: C compiler cannot create executables
See `config.log' for more details.
===>  Script "../gcc-4.6.4/configure" failed unexpectedly.
Please report the problem to gerald_at_FreeBSD.org [maintainer] and attach the
"/usr/ports/lang/gcc/work/build/config.log" including the output of the 
failure
of your make command. Also, it might be a good idea to provide an overview
of all packages installed on your system (e.g. a /usr/local/sbin/pkg-static
info -g -Ea).
*** Error code 1

#############################################
/etc/make.conf

.if ${.CURDIR:N*/ports/lang/gcc*} == ""
CFLAGS= -O2 -march=athlon64-sse3 -mtune=athlon64-sse3 -pipe -Wformat
CPPFLAGS+= -D_FORTIFY_SOURCE=2
USE_GCC=4.6
.endif

#pkg info -ix gcc
gcc-4.6.3
gcc-ecj-4.5
gccmakedep-1.0.2_1

-- 
Alexander