/usr/lib/GNUstep/Applications/SystemPreferences.app/stamp.make is in systempreferences.app 1.1.0-2build3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | OLD_GNUSTEP_STAMP_ASTRING = _SystemPreferences-SystemPreferences.tiff--
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