/usr/lib/ocaml/xstr/META is in libxstr-ocaml-dev 0.2.1-21build6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | version = "0.2.1"
requires = ""
archive(byte) = "xstr.cma"
archive(native) = "xstr.cmxa"
|