[CMake] INCLUDE_DIR or INCLUDE_DIRS?

[Kedzierski, Artur CIV NAVSURFWARCENDIV CORONA]

	Hi,

	I am looking at the readme.txt file in CMake's modules
directory. It says:

Please use the following consistent variable names for general use.
XXX_INCLUDE_DIRS  
...
You do not have to provide all of the above variables. You should
provide [...] XXX_INCLUDE_DIR [...]

	Should I provide XXX_INCLUDE_DIR or XXX_INCLUDE_DIRS?
	Thank You.

--
Artur Kedzierski
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