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EXT_ROOT__SPIWriter_DSP is blank

I have a project that references this "System Macro".  The value is blank so that it goes to the root of the drive.  The project has never been from the root, it has always been stored in a target sub-directory.  Since the project is already stored in source control, I would rather fix it than replace it.

How can I fix the value of EXT_ROOT__SPIWriter_DSP?