/usr/share/postgresql-common/dh_make_pgxs/ is in postgresql-server-dev-all 190.
This file is owned by root:root, with mode 0o755.
..
/usr/share/postgresql-common/dh_make_pgxs/debian/
/usr/share/postgresql-common/dh_make_pgxs/debian/compat
/usr/share/postgresql-common/dh_make_pgxs/debian/control.in
/usr/share/postgresql-common/dh_make_pgxs/debian/copyright
/usr/share/postgresql-common/dh_make_pgxs/debian/pgversions
/usr/share/postgresql-common/dh_make_pgxs/debian/rules
/usr/share/postgresql-common/dh_make_pgxs/debian/source/
/usr/share/postgresql-common/dh_make_pgxs/debian/source/format
/usr/share/postgresql-common/dh_make_pgxs/debian/tests/
/usr/share/postgresql-common/dh_make_pgxs/debian/tests/control
/usr/share/postgresql-common/dh_make_pgxs/debian/tests/installcheck