[CentOS] gnome-session missing "--silent" switch

[Lorenzo Quatrini]

Hi,
following this documentation (http://tinyurl.com/66z6ly) I found that on the 
version currently shipped whith CentOS 5 (2.16.0) is missing the "--silent" 
switch for use with gnome-session-save

Do you know a workaround to accomplish the same result of "gnome-session-save 
--kill --silent" wich save and close the current session without user intervention?

Or can you point me on the right direction to rebuild the SRPM with the patch 
for this bug (http://bugzilla.gnome.org/show_bug.cgi?id=149447)?

thanks,

Lorenzo Quatrini