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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.

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

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