The standard "make obj" process seems to need a writable source
	tree in order to work.

	My old meathod of building 3 archs at the same time was to NFS
	export the source tree read-only and then use union mounts on
	the 3 different archs to build all 3 at the same time from the same
	source tree without nasty things like following bad symlinks happening.

	So, is there some way to convince the make process to put ALL files
	somewhere else WITHOUT using symlinks in the source tree? ALL files
	includes droppings like .depend in addition to .o's, .so's, .a's and
	such.

	Or is using the union mount system still the best way to go to keep
	the source tree ABSOLUTELY clean of build related droppings?

		-Rob