/usr/share/doc/libplplot12/examples/ocaml/ is in libplplot-dev 5.10.0-0ubuntu5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libplplot12/examples/ocaml/CMakeLists.txt
/usr/share/doc/libplplot12/examples/ocaml/Makefile
/usr/share/doc/libplplot12/examples/ocaml/x00.ml
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/usr/share/doc/libplplot12/examples/ocaml/xgtk_interface.ml
/usr/share/doc/libplplot12/examples/ocaml/xplot01.ml