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Here is an example of a rule:
foo.o : foo.c defs.h # module for twiddling the frobs cc -c -g foo.c |
Its target is `foo.o' and its prerequisites are `foo.c' and `defs.h'. It has one command, which is `cc -c -g foo.c'. The command line starts with a tab to identify it as a command.
This rule says two things:
cc
as stated.
The command does not explicitly mention `defs.h', but we presume
that `foo.c' includes it, and that that is why `defs.h' was
added to the prerequisites.