> I'm sorry to ask this kind of beginer question, but I thought it was possible
> to separate object files from the source tree by creating /usr/obj (and/or
> setting some environment variable). However whatever I tried failed for me.
> 
> Could someone, who knows what do, to please help me?

in a nutshell:

cd /usr/src
make cleandir				<= clean out old objects first
mkdir /usr/obj
make obj				<= set things up to use obj dirs
make					<= and build.


cgd