emacs22 and version control

[T o n g <mlist4suntong@yahoo.com>]

Hi,

I upgrade my emacs from emacs21 to emacs22, but the default version 
control for rcs files are not working any more. 

According to 
http://www.gnu.org/software/emacs/manual/html_node/emacs/Version-
Control.html
"VC is enabled by default in Emacs."

and I never have to do anything before to get emacs and version control 
work for rcs[1]. Do I have to do anything special for emacs22? 

Further, "currently, it [emacs VC] supports ... Subversion", any one 
knows how to utilize it please? How about git? 

Thanks a lot

[1]. As per http://www.linux.org/docs/ldp/howto/RCS-8.html

"When editing a file with emacs(1) which is registered with RCS, the 
command vc-toggle-read-only (bound to C-x C-q by default) will check a 
file in to the emacs's Version Control, and then into RCS. Emacs will 
open a buffer where you can type a log message to be included in the RCS 
log. . . "

but all I get is 

 File is under version-control; use C-x v v to check in/out [2 times]

without getting into the vc log message buffer.

Thanks

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