GNU make manual 翻译(三十四)

继续翻译

   * A "directive" is an instruction for `make' to do something special 
     while reading the makefile.  These include:                        
                        
        * Reading another makefile (*note Including Other Makefiles: 
          Include.).                        
                        
        * Deciding (based on the values of variables) whether to use or 
          ignore a part of the makefile (*note Conditional Parts of  
          Makefiles: Conditionals.).                        
                        
        * Defining a variable from a verbatim string containing 
          multiple lines (*note Defining Multi-Line Variables: 
          Multi-Line.).                        

指令就是一系列需要 make 在读取 makefile的时候要做的事情。包括：

   读取另一个 makefile (*note Including Other Makefiles: Include)

   决定(根据变量的值)是忽略还是使用 makfile的某一个部分

   (*note Conditional Parts of Makfiles: Confitionals.)

   * 从一个多行字符串来定义一个变量(*note Defining Multi-Line Variables: Multi-Line.)

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