>> > I've concluded that "MKOBJDIRS=yes" is a good
>> > idea in all cases to keep object files out of
>> > the source tree.
>> 
>> Isn't that the default?
>
>Not according to "/usr/share/mk/bsd.README" which I quote:
>
>MKOBJDIRS	If "no", don't create objdirs during a "make build".
>		"no" by default.
>
>$ cd /usr/share/mk
>$ grep -n MKOBJDIRS *.mk
>bsd.own.mk:408:MKOBJDIRS:=      no
>$

that's true, but if you're using build.sh, you should also know that

$ ./build.sh -h
Usage:
build.sh [-bdEnortUu] [-a arch] [-B buildid] [-D dest] [-i idir] [-j njob]
    [-k kernel] [-M obj] [-m mach] [-O obj] [-R release] [-T tools] [-w wrapper]
...
    -o          set MKOBJDIRS=no (do not create objdirs at start of build)
...
$

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