unikernel/duniverse/dune_/doc/explanation/tour/vendor.rst

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+Vendored Libraries
+==================
+
+As an opam package, Dune has no dependencies. But it uses some existing
+libraries by copying, or "vendoring", their source code into the
+:file:`vendor/` directory.
+
+In some cases, the external dependency is extracted from the upstream
+repository. In other cases, we carry patches and refer to a fork in the
+`ocaml-dune GitHub organization <https://github.com/ocaml-dune>`_.
+
+The source code in the :file:`vendor/` directory is not meant to be edited
+directly. Instead, it is edited in the external repository, and the copy in the
+Dune source tree is updated by running an update script, such as
+`update-spawn.sh <https://github.com/ocaml/dune/blob/3.15.0/vendor/update-spawn.sh>`_.