mkdir ~/local/emacs
mkdir ~/tmp
cd ~/tmp
wget http://core.ring.gr.jp/pub/GNU/emacs/emacs-22.3.tar.gz
tar -zxvf emacs-22.3.tar.gz
cd emacs-22.3/
./configure --prefix=$HOME/local/emacs
make
make install
ln -s ~/local/emacs/bin/emacs ~/bin/emacs
which emacs