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A conditional directive 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 recipes at the time of execution.
| 7.1 Example of a Conditional | Example of a conditional | |
| 7.2 Syntax of Conditionals | The syntax of conditionals. | |
| 7.3 Conditionals that Test Flags | Conditionals that test flags. |
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