Gcc compilation "cannot compute suffix of object files: cannot compile"

I'm actually reading the LFS book (version 7.1) and I'm blocked at page 53. Trying to compile gcc, I tried the following command:

./configure --target=$LFS_TGT --prefix=$LFS/build/gcc-build --disable-nls\--disable-shared --disable-multilib --disable-decimal-float --disable-threads\--disable-libmudflap --disable-libssp --disable-libgomp --disable-libquadmath\--disable-target-libiberty --disable-target-zlib\--enable-languages=c\--without-ppl --without-cloog\--with-mpfr-include=$LFS/source/mpfr/src--with-mpfr-lib=$LFS/source/mpfr/src/.libs\--with-gmp-include=/mnt/LFS/source/gmp\--with-gmp-lib=/mnt/LFS/source/gmp/.libs\--with-mpc-include=/mnt/LFS/source/mpc/src\--with-mpc-lib=/mnt/LFS/source/mpc/src/.libs

to run the configure script of gcc (of course I already compiled mpfr, mpc and gmp as well).But once I launch:

make -j4

I get the following error:

checking for suffix of object files... configure: error: in `/mnt/LFS/source/gcc-4.6.2/x86_64-lfs-linux-gnu/libgcc':configure: error: cannot compute suffix of object files: cannot compileSee `config.log' for more details.make[1]: *** [configure-target-libgcc] Error 1

I tried to google for it and tried the solutions I found but nothing worked. Does anyone know why I get this error?