/usr/ is in postgresql-plperl-9.3 9.3.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/postgresql/
/usr/lib/postgresql/9.3/
/usr/lib/postgresql/9.3/lib/
/usr/lib/postgresql/9.3/lib/plperl.so
/usr/share/
/usr/share/doc/
/usr/share/doc/postgresql-plperl-9.3/
/usr/share/doc/postgresql-plperl-9.3/copyright
/usr/share/postgresql/
/usr/share/postgresql/9.3/
/usr/share/postgresql/9.3/extension/
/usr/share/postgresql/9.3/extension/plperlu--unpackaged--1.0.sql
/usr/share/postgresql/9.3/extension/plperlu--1.0.sql
/usr/share/postgresql/9.3/extension/plperl--1.0.sql
/usr/share/postgresql/9.3/extension/plperlu.control
/usr/share/postgresql/9.3/extension/plperl.control
/usr/share/postgresql/9.3/extension/plperl--unpackaged--1.0.sql
/usr/share/doc/postgresql-plperl-9.3/changelog.Debian.gz