Error compiling arm-elf-gcc-4.5.0

[Massimiliano Cialdi <massimiliano.cialdi@powersoft.it>]

I have configured as follows:
configure --enable-languages=c,c++ --target=arm-elf --with-gnu-as
--with-gnu-ld --prefix=path-to/arm-elf-gcc-4.5.0 --with-newlib
--disable-shared --enable-newlib --enable-multilib --enable-interwork
--disable-threads  --disable-nls --enable-libstdcxx-allocator=malloc
--with-mpc=/usr/local/mpc

I have static version of mpc 0.8.1

when I make all I get the following error:

Links are now set up to build a cross-compiler
from x86_64-unknown-linux-gnu to arm-unknown-elf.
checking for exported symbols...
path-to/arm-elf-gcc-4.5.0/arm-elf/bin/objdump: conftest: File format not
recognized
checking for -rdynamic... path-to/arm-elf-gcc-4.5.0/arm-elf/bin/objdump:
conftest: File format not recognized

my system is ubuntu 9.10 64 bit with
gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu9)

binutils:
GNU ld (GNU Binutils for Ubuntu) 2.20

what is wrong with it?

thanks