Custom suffixes and rules

Make uses a special target, named .SUFFIXES to allow you to define your own suffixes. For example, the dependency line:
.SUFFIXES: .foo .bar
tells make that you will be using these special suffixes to make your own rules.

Similar to how make already knows how to make a .o file from a .c file, you can define rules in the following manner:

.foo.bar:
        tr '[A-Z][a-z]' '[N-Z][A-M][n-z][a-m]' < $< > $@        
.c.o:
        $(CC) $(CFLAGS) -c $<

The first rule allows you to create a .bar file from a .foo file. (Don't worry about what it does, it basically scrambles the file.) The second rule is the default rule used by make to create a .o file from a .c file.

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