/usr/include/openvas/base/ is in libopenvas-dev 9.0.1-4.
This file is owned by root:root, with mode 0o755.
..
/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