/usr/lib/GNUstep/Applications/Gridlock.app/stamp.make is in gridlock.app 1.10-3.2build1.
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 = _NSApplication-Gridlock.tiff--
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