trouble installing gcc 4.8.1

trouble installing gcc 4.8.1

I installed gcc as described above it installed pretty well, but when I
call gcc -v it just shows the former version gcc4.6.3. I do not know where
to find the installation so that I can make a link to call it. Any help?
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
All were done from my home directory.