/usr/include/openvas/ is in libopenvas-dev 9.0.1-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/openvas/base/
/usr/include/openvas/base/array.h
/usr/include/openvas/base/credentials.h
/usr/include/openvas/base/cvss.h
/usr/include/openvas/base/drop_privileges.h
/usr/include/openvas/base/gpgme_util.h
/usr/include/openvas/base/kb.h
/usr/include/openvas/base/nvti.h
/usr/include/openvas/base/nvticache.h
/usr/include/openvas/base/openvas_compress.h
/usr/include/openvas/base/openvas_file.h
/usr/include/openvas/base/openvas_hosts.h
/usr/include/openvas/base/openvas_networking.h
/usr/include/openvas/base/openvas_string.h
/usr/include/openvas/base/pidfile.h
/usr/include/openvas/base/pwpolicy.h
/usr/include/openvas/base/settings.h
/usr/include/openvas/misc/
/usr/include/openvas/misc/arglists.h
/usr/include/openvas/misc/bpf_share.h
/usr/include/openvas/misc/ftp_funcs.h
/usr/include/openvas/misc/internal_com.h
/usr/include/openvas/misc/ldap_connect_auth.h
/usr/include/openvas/misc/network.h
/usr/include/openvas/misc/nvt_categories.h
/usr/include/openvas/misc/openvas_auth.h
/usr/include/openvas/misc/openvas_logging.h
/usr/include/openvas/misc/openvas_proctitle.h
/usr/include/openvas/misc/openvas_server.h
/usr/include/openvas/misc/openvas_ssh.h
/usr/include/openvas/misc/openvas_uuid.h
/usr/include/openvas/misc/pcap_openvas.h
/usr/include/openvas/misc/plugutils.h
/usr/include/openvas/misc/popen.h
/usr/include/openvas/misc/prefs.h
/usr/include/openvas/misc/radius.h
/usr/include/openvas/misc/www_funcs.h
/usr/include/openvas/nasl/
/usr/include/openvas/nasl/nasl.h
/usr/include/openvas/omp/
/usr/include/openvas/omp/omp.h
/usr/include/openvas/omp/xml.h
/usr/include/openvas/osp/
/usr/include/openvas/osp/osp.h