/usr/share/openturns/m4/ is in libopenturns-dev 0.15-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/openturns/m4/m4/
/usr/share/openturns/m4/m4/acx_blas.m4
/usr/share/openturns/m4/m4/acx_lapack.m4
/usr/share/openturns/m4/m4/ot_check_dot.m4
/usr/share/openturns/m4/m4/ot_check_doxygen.m4
/usr/share/openturns/m4/m4/ot_check_gs.m4
/usr/share/openturns/m4/m4/ot_check_libdl.m4
/usr/share/openturns/m4/m4/ot_check_libxml2.m4
/usr/share/openturns/m4/m4/ot_check_mpi.m4
/usr/share/openturns/m4/m4/ot_check_openturns.m4
/usr/share/openturns/m4/m4/ot_check_r.m4
/usr/share/openturns/m4/m4/ot_check_r_packages.m4
/usr/share/openturns/m4/m4/ot_check_regex.m4
/usr/share/openturns/m4/m4/ot_check_tbb.m4
/usr/share/openturns/m4/m4/ot_check_threads.m4
/usr/share/openturns/m4/m4/ot_check_win32.m4
/usr/share/openturns/m4/m4/ot_debug.m4
/usr/share/openturns/m4/m4/ot_get_object_default_name.m4