make -DRESTART buildworld

[Julian Elischer]

Could someone who knows the buildworld target give a comment as to 
whether it would
 be possible to do a  -DRESTART option?

I have done -DNOCLEAN but it still does quite a bit..
it would be nice to have an option that did
-DNOCLEAN and -DNO_TOOLS -DNO_MKDEP and -DNO_CHROOTLIBS
(if they existed, and went straight to doing the build where it left off 
(and where you
probably fixed the problem..

it's really annoying to have to restart the buildworld after if falls 
over 95% through and have it start
at the beginning again..