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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
"sees" in the makefile, so they cannot be used to control shell
commands 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.