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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  The simplest use is to recompile every file that is out
of date.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want just to find out which files are out of date without changing them.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:
`0'
     The exit status is zero if `make' is successful.

`2'
     The exit status is two if `make' encounters any errors.  It will
     print messages describing the particular errors.

`1'
     The exit status is one if you use the `-q' flag and `make'
     determines that some target is not already up to date.  *Note
     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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