This means that incorrect dependencies are used the first time a source
   file is rebuilt, but after that they self correct.  It also completely
   removes the need for a 'make depend' pass.


i think this is actually a step backwards.  we may lose the make depend
step, but we gain incorrectness...  now i have to run 'make all' twice
to be sure, which is _way_ slower than 'make dependall' once.


.mrg.