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 6.4 How Variables Get Their Values
 ==================================
 
 Variables can get values in several different ways:
 
    * You can specify an overriding value when you run `make'.  
      Overriding Variables Overriding.
 
    * You can specify a value in the makefile, either with an assignment
      ( Setting Variables Setting.) or with a verbatim definition
      ( Defining Variables Verbatim Defining.).
 
    * Variables in the environment become `make' variables.  
      Variables from the Environment Environment.
 
    * Several "automatic" variables are given new values for each rule.
      Each of these has a single conventional use.   Automatic
      Variables.
 
    * Several variables have constant initial values.   Variables
      Used by Implicit Rules Implicit Variables.
 

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