Where are the "System Macros" defined for CCSv4?

I am new to CCSv4.

In the project Properties dialog box, under C/C++ Build, there is a tab named Macros. This tab in the dialog box provides a facility for defining and editing "User macros". It also displays "System Macros", but these are not editable.

On my system, one of these "System Macros" is incorrect, specifically C5500_CSL_CG_ROOT. However, I have not yet been able to determine where this "System Macro" is defined, so that I can correct it.

What - or where - is the source of definition for "System Macros"?

Thanks in advance for any advice...