WDK Sources, change obfre_win7_x86 directory location?

I've tried searching Internet (nothing found), I've tried chatgpt, it told me to use OBJ_PATH but all that did was to cause the build to fail with it can't find the file %OBJ_PATH%_objects.mak. The objfre_xxx_xxx dir is always in the current directory and I want it in a sub-directory (I just ignored it all these years, but now I'd liked to clean things up).

How do I tell the WDK where to create the objXXXX directory?

Thanks!

probably want OBJECT_ROOT, OBJECT_ROOT (Windows Driver Kit) | Microsoft Learn