GNU make manual 翻译(九)

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   A "recipe" is an action that `make' carries out.  A recipe may have    
more than one command, either on the same line or each on its own line.    
*Please note:* you need to put a tab character at the beginning of    
every recipe line!  This is an obscurity that catches the unwary.  If    
you prefer to prefix your recipes with a character other than tab, you    
can set the `.RECIPEPREFIX' variable to an alternate character (*note    
Special Variables::).    
    
   Usually a recipe is in a rule with prerequisites and serves to    
create a target file if any of the prerequisites change.  However, the    
rule that specifies a recipe for the target need not have    
prerequisites.  For example, the rule containing the delete command    
associated with the target `clean' does not have prerequisites.    

片段(recipe)是 make 所执行的一个动作。一个片段可以由多个命令，或者在一行，或者每个命令各自一行。

请注意：你需要在每个 片段行前 输入一个 tab 符！这是容易被粗心的人忽略的地方。

如果你想用 tab 符之外的其他字符，你可以设置 .RECIPEPREFIX 变量 为其他字符。(*note Special Variables::(特殊变量))

通常，一个片段是在带有前提条件的 规则里面。一旦前提条件发生变化，就会生成目的(target)文件。

但是，规定了片段的规则也可以不需要前提条件。例如，关联到目的 clean 的，包含 delete 命令的规则，就不需要什么前提条件。

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