/usr/lib/GNUstep/Bundles/GSPrinting/GSCUPS.bundle/stamp.make is in gnustep-gui-runtime 0.20.0-2.
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 = _GSCUPSPrincipalClass-
|