(make.info) Conditionals

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 Conditional Parts of Makefiles
 ******************************
 
    A "conditional" causes part of a makefile to be obeyed or ignored
 depending on the values of variables.  Conditionals can compare the
 value of one variable to another, or the value of a variable to a
 constant string.  Conditionals control what `make' actually "sees" in
 the makefile, so they _cannot_ be used to control shell commands at the
 time of execution.
 

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* Conditional Example         Example of a conditional
* Conditional Syntax          The syntax of conditionals.
* Testing Flags               Conditionals that test flags.
 

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