/usr/ is in libpostgresql-ocaml-dev 2.0.5-3build1.
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/usr/lib/
/usr/lib/ocaml/
/usr/lib/ocaml/postgresql/
/usr/lib/ocaml/postgresql/libpostgresql_stubs.a
/usr/lib/ocaml/postgresql/postgresql.a
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/usr/share/doc/libpostgresql-ocaml-dev/README.md
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/usr/share/doc/libpostgresql-ocaml-dev/copyright
/usr/share/doc/libpostgresql-ocaml-dev/examples/
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/usr/share/doc-base/
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