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PSP CSLR SPI Example does not build

Following the readme.txt in C:\Program Files\Texas Instruments\pspdrivers_01_30_00_06\packages\ti\pspiom\cslr\evm6748\examples\spi I tried to load and build this example.  But...I get the error, "could not open source file "ti/pspiom/cslr/soc_C6748.h""

In the project Includes is the directory, "C:\Program Files\Texas Instruments\pspdrivers_01_30_00_06\packages\ti". Ah ha! The "/ti/" is surperfluous.  Upon closer examination the include path "${EXT_ROOT__spi_example}/../../../../.." does not have enough dot-dots.  Added "/..", now it builds.

But...that is not the question.  Another include path is "${C6000_CSL_CG_ROOT}/include".  C6000_CSL_CG_ROOT is not set.  The path becomes "/include". 

This raises the first question, why not?  Why is the CSL_CG_ROOT not set? 

And the follow on question, If I set it in the Macros tab, what would I set it to?  There is no include folder under "C:\Program Files\Texas Instruments\pspdrivers_01_30_00_06\packages\ti\pspiom\cslr".

And, finally, the curisosity question.  is the path "EXT_ROOT__spi_example" a concatenation?  How does it know?