glibc update error

I just install a fresh system. I switch to developer profile, and then update system. While system building, I get error with glibc-2.12.2 update with following error message:
Checking for suffix of object files... configure: error: in '/var/calculate/tmp/portage/sys-libs/glibc-2.12.2/work/build-amd64-x86_64-pc-linux-gnu-nptl': configure: error: cannot compute suffix for object files: cannot compile
How to build glibc using this profile under x86_64 processor?

I guess this a problem with cflags option.
Sorry for disturb :frowning: