You can get and install Emacs Version 23 (emacs-unicode-2) by the following commands.
% cd _WORKING_DIRECTORY_
% cvs -z3 -d:pserver:anonymous@cvs.savannah.gnu.org:/sources/emacs co -r emacs-unicode-2 emacs
% cd emacs
% ./configure
% make bootstrap
% make install
The last step installs everything under /usr/local (e.g. the executable emacs in /usr/local/bin). So, typing "emacs" in the command line of a terminal invokes the just installed emacs. Please check it by invoking this command:
% emacs --version
If it prints "GNU Emacs 23.0.0.X", you are done. If not, perhaps you don't have /usr/local/bin in your PATH environment variable, or you have another emacs somewhere in PATH before /usr/local/bin. In such cases, please put /usr/local/bin at the head of PATH.
If you already have some version of Emacs installed under /usr/local/bin and don't want to override it, instead of the last step (make install), do this:
% ln -s _WORKING_DIRECTORY_/emacs/src/emacs /usr/local/bin/emacs-unicode
Then, you can invoke this emacs by the name "emacs-unicode".