version `GLIBC_2.14' not found (required by build/genhooks)‏

[Teodori Serge]

Hello,
I'm building a toolchain in /opt dir. I have already build and installed 
glibc-2.14 and binutils-2.21.1a in /opt.
Now I want to build and install gcc-4.6.1 with gmp, mpfr and mpc also in 
/opt.

Here is my configure:

../gcc-4.6.1/configure --prefix=/tools --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

Here is the last output of my build:

build/genhooks > tmp-target-hooks-def.h
build/genhooks: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.14' 
not found (required by build/genhooks)
make[3]: *** [s-target-hooks-def-h] Error 1
make[3]: *** Waiting for unfinished jobs....
rm gcc.pod
make[3]: Leaving directory `/home/serge/Documents/gcc-build/gcc'
make[2]: *** [all-stage2-gcc] Error 2
make[2]: Leaving directory `/home/serge/Documents/gcc-build'
make[1]: *** [stage2-bubble] Error 2
make[1]: Leaving directory `/home/serge/Documents/gcc-build'
make: *** [all] Error 2

The problem is very obvious, gcc build is not taking the toolchain 
glibc-2.14 in /opt/lib but it is taking the one the host uses which is 
eglibc-2.13 in /usr/lib.
I set various flags to the linker and compiler, they are all looking in 
the right directory. It must be something in the configure script?
Can anyone help me please.
Thank you