build/installworld break under -j n for n>1

[Chuck Swiger]

Aryeh M. Friedman wrote:
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> Installworld fails to wait for buildworld to complete under the
> following command line:
> 
> make -j n buildworld installworld
> 
> I have not tested for n!=10.

While I find your confidence in doing an installworld without checking for 
whether the build completed sucessfully and without doing a human review to be 
admirable :-), perhaps consider doing this instead:

    make -j n buildworld && make installworld

...?

-- 
-Chuck