[Savannah-hackers] From a newbie: how to download and install Emacs CVS 21.3.50?

[Rodolfo Medina]

Dear Savannah hackers,

someone told me I need Emacs CVS 21.3.50
in order to type chinese characters using Emacs and `scim' package.
I visited the web site http://savannah.gnu.org
but was not able to find any package named `Emacs CVS 21.3.50'.
Excuse my ignorance: I don't even know the difference
between a `normal' release of Emacs
(I've just upgraded to the 21.3 version)
and a CVS one.
Maybe could you be so kind as to provide help?
Where and how to download and install Emacs CVS 21.3.50?
I installed Emacs-21.3 following the usual 
`./configure', `make' and `make install' procedure.
Is the installation of Emacs CVS 21.3.50 much more complicated than this?

Excuse me, and thanks,
                                Rodolfo