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 9 How to Run `make'
 A makefile that says how to recompile a program can be used in more
 than one way.  The simplest use is to recompile every file that is out
 of date.  Usually, makefiles are written so that if you run `make' with
 no arguments, it does just that.
    But you might want to update only some of the files; you might want
 to use a different compiler or different compiler options; you might
 want just to find out which files are out of date without changing them.
    By giving arguments when you run `make', you can do any of these
 things and many others.
    The exit status of `make' is always one of three values:
      The exit status is zero if `make' is successful.
      The exit status is two if `make' encounters any errors.  It will
      print messages describing the particular errors.
      The exit status is one if you use the `-q' flag and `make'
      determines that some target is not already up to date.  
      Instead of Executing the Commands Instead of Execution.


* Makefile Arguments          How to specify which makefile to use.
* Goals                       How to use goal arguments to specify which
                                   parts of the makefile to use.
* Instead of Execution        How to use mode flags to specify what
                                   kind of thing to do with the commands
                                   in the makefile other than simply
                                   execute them.
* Avoiding Compilation        How to avoid recompiling certain files.
* Overriding                  How to override a variable to specify
                                   an alternate compiler and other things.
* Testing                     How to proceed past some errors, to
                                   test compilation.
* Options Summary             Summary of Options
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