CVS update for only one platform

[AGC <agcarver+netbsd%acarver.net@localhost>]

I'm trying to do a CVS update to try the snprintf fixes from the other 
thread.  While I'm doing that, is there a way to configure the CVS 
update to only pull what is necessary for a single platform?  I only 
need sparc so downloading everything like arm, amiga, m68k and the 
others is of little value.  It would also save space on my very limited 
disk.  I've only got a single 2 GB disk available for /usr/src.  I'm 
trying to find another disk to give me some more space but it's all I 
have at the moment.