/usr/share/postgresql/ is in postgresql-9.4-pgrouting 2.0.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/postgresql/9.4/
/usr/share/postgresql/9.4/contrib/
/usr/share/postgresql/9.4/contrib/pgrouting-2.0/
/usr/share/postgresql/9.4/contrib/pgrouting-2.0/pgrouting.control
/usr/share/postgresql/9.4/contrib/pgrouting-2.0/pgrouting.sql
/usr/share/postgresql/9.4/contrib/pgrouting-2.0/pgrouting_dd_legacy.sql
/usr/share/postgresql/9.4/contrib/pgrouting-2.0/pgrouting_legacy.sql
/usr/share/postgresql/9.4/extension/
/usr/share/postgresql/9.4/extension/pgrouting--2.0.0.sql
/usr/share/postgresql/9.4/extension/pgrouting.control
/usr/share/postgresql/9.4/extension/pgrouting_dd_legacy.sql
/usr/share/postgresql/9.4/extension/pgrouting_legacy.sql