Since I once again missed that 'cvs update -kb' I decided to do 
something about it. I have attached a bat-file that checks for this and 
also for the existence of 'find' and 'xargs' which I believe also are 
needed to build Emacs.

This runs under cmd.exe and it also seems to work under command.com.

Could we please augment configure.bat with this? ;-)