Makefile question

[Ira B. Ekhaus]

hello,
	I currently have my directory mounted to two machines with  different
cpu's, ie DEC and Sun.
What is  the easiest way to set up my makefiles, to use the current CPU to 
decide whether an object file should be updated.  It would be great if 
libraries could be set up for both types of cpu's, and only updated if the
source code was newer, but a separate object file would be susceptible to 
updating whenever a make command on a different CPU type than the object file.
thanks,
ira ekhaus
ibekhaus at athena.mit.edu