Install GCC with an easier way

tar xzf gcc-4.6.2.tar.gz
cd gcc-4.6.2
./contrib/download_prerequisites
cd ..
mkdir objdir
cd objdir
$PWD/../gcc-4.6.2/configure --prefix=$HOME/gcc-4.6.2 
make
make install

Note: Things positioned after "--prefix=" is a directory where you put your gcc files in.

For more information, please refer to :http://gcc.gnu.org/wiki/InstallingGCC