From subsecret
zlib
tar xf zlib-1.2.5.tar.gz cd zlib-1.2.5
Edit configure and replace "shared=0" with "shared=1" near the place where the following is written: "echo No shared library support."
./configure --prefix=/tools make make install cd ..
binutils
tar xf binutils-2.21.tar.gz cd binutils-2.21 ./configure --with-build-sysroot=/tools --prefix=/tools make -j 12 make install cd ..
We are now ready for next step