>        checking for gmp.h... no
>        configure: error: gmp.h can't be found, or is unusable.
>        make[1]: *** [configure-mpfr] Error 1
>        make[1]: Leaving directory `/media/lfs/build/gcc-4.5.2'
>        make: *** [all] Error 2
>
> What this means?

Looks like you're missing gmp. Did you copied the gmp and mpfr sources
under the gcc source's directory.
Once inside that directory you should do:

tar -jxf ../mpfr-3.0.1.tar.bz2
mv -v mpfr-3.0.1 mpfr
tar -jxf ../gmp-5.0.2.tar.bz2
mv -v gmp-5.0.2 gmp
tar -zxf ../mpc-0.9.tar.gz
mv -v mpc-0.9 mpc

So by this point you should have three more folders under the gcc
directory named "mpfr" "gmp" and "mpc". Those should be the names of
the folders (without number versions).
You can read more about it here:
http://gcc.gnu.org/install/prerequisites.html

Greetings,

               Juan.
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