make for rcs

[Guy Harris]

We have a version of System III "make" that runs under 4.2BSD and checks
files out automatically when they are needed.  It doesn't use the S3
"make"s SCCS scheme, it has built-in knowledge of RCS which makes various
things work better.  Among other things, if you put in your own ".c.o" rule
you don't have to also add a ".c~.o" rule; i.e., 99% of all Makefiles
should not have to be changed to support RCS other than making sure *all*
dependencies are listed (if they aren't listed "make" doesn't realize that
the file is needed and doesn't bother checking it out) - then again, you
should always list all dependencies anyway or "make" can't do the job
it's supposed to.

	Guy Harris
	{seismo,ihnp4,allegra}!rlgvax!guy