-M option to cc

[Roy Smith]

	I've got a fairly large software package, with many makefiles that
depend on "cc -M" to create the dependency graphs.  I'd like this to be
portable to as many other systems as possible.  My question is, how common
is "cc -M"?  I know BSD4.3 has it, as do SunOS and Ultrix.  What about
System-5 and other flavors?

	If it turns out that expecting virtually everybody to have "cc -M"
or the equivalent is unreasonable, is there a public-domain program that I
could distribute along with my code which would do the same thing?
-- 
Roy Smith, System Administrator
Public Health Research Institute
{allegra,philabs,cmcl2,rutgers}!phri!roy -or- phri!roy at uunet.uu.net
"The connector is the network"