Installatin problem in installing gcc-4.9.0

Hi to all,
i'm installing gcc-4.9.0 into my RedHat 6.4 pc. I configure like this :-

  # mkdir objdir
  # ./../gcc-4.9.0/configure
  # make

and now having this problem :-

checking for x86_64-unknown-linux-gnu-gcc... /software/gcc/objdir/./gcc/xgcc -B/software/gcc/objdir/./gcc/ -B/usr/local/x86_64-unknown-linux-gnu/bin/ -B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/x86_64-unknown-linux-gnu/include -isystem /usr/local/x86_64-unknown-linux-gnu/sys-include   
checking for suffix of object files... configure: error: in `/software/gcc/objdir/x86_64-unknown-linux-gnu/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
make[2]: *** [configure-stage1-target-libgcc] Error 1
make[2]: Leaving directory `/software/gcc/objdir'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/software/gcc/objdir'
make: *** [all] Error 2

-----------------------------------------------------
what should I do for this error to overcome?