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Makefiles also contain information about what to do when a depended-on file
changes. This information is provided in command lines, each of which
immediately follows a dependency line. The command line looks like a
command that you would issue yourself if you were providing a command line
by hand. For example, if you were to relink the object files to produce a
new analyze_train program, you would issue the following command:
CC -o analyze_train trains.o containers.o cars.o
Note, however, that command lines in makefiles must begin with a tab character:
CC -o analyze_train trains.o containers.o cars.o