un this scrip as su to install gcc-4.7.1 in /share/apps/gcc in a Rocks Linux cluster
# Note that the installation may take up to a few hours
#! /bin/bash

# source http://gcc.gnu.org/wiki/InstallingGCC
#wget http://www2.fizik.usm.my/configrepo/howto/gcc/gcc.tar.bz2
mkdir /share
mkdir /share/apps
mkdir /share/apps/configrepo

cd /share/apps

wget http://comsics.usm.my/tlyoon/configrepo/howto/customise_centos/gcc/gcc.tar.bz2
tar jxf gcc.tar.bz2
mv gcc.tar.bz2 configrepo/

cd gcc-4.7.1
./contrib/download_prerequisites

cd ..
mkdir objdir
cd objdir
../configure --prefix=/share/apps/gcc
make
make install