/usr/include/libprelude/ is in libprelude-dev 1.0.0-11ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libprelude/common.h
/usr/include/libprelude/daemonize.h
/usr/include/libprelude/idmef-additional-data.h
/usr/include/libprelude/idmef-class.h
/usr/include/libprelude/idmef-criteria.h
/usr/include/libprelude/idmef-criteria.hxx
/usr/include/libprelude/idmef-criterion-value.h
/usr/include/libprelude/idmef-data.h
/usr/include/libprelude/idmef-message-helpers.h
/usr/include/libprelude/idmef-message-id.h
/usr/include/libprelude/idmef-message-print.h
/usr/include/libprelude/idmef-message-read.h
/usr/include/libprelude/idmef-message-write.h
/usr/include/libprelude/idmef-path.h
/usr/include/libprelude/idmef-path.hxx
/usr/include/libprelude/idmef-time.h
/usr/include/libprelude/idmef-time.hxx
/usr/include/libprelude/idmef-tree-data.h
/usr/include/libprelude/idmef-tree-wrap.h
/usr/include/libprelude/idmef-value-type.h
/usr/include/libprelude/idmef-value.h
/usr/include/libprelude/idmef-value.hxx
/usr/include/libprelude/idmef.h
/usr/include/libprelude/idmef.hxx
/usr/include/libprelude/prelude-async.h
/usr/include/libprelude/prelude-client-easy.hxx
/usr/include/libprelude/prelude-client-profile.h
/usr/include/libprelude/prelude-client-profile.hxx
/usr/include/libprelude/prelude-client.h
/usr/include/libprelude/prelude-client.hxx
/usr/include/libprelude/prelude-config.h
/usr/include/libprelude/prelude-connection-pool.h
/usr/include/libprelude/prelude-connection-pool.hxx
/usr/include/libprelude/prelude-connection.h
/usr/include/libprelude/prelude-connection.hxx
/usr/include/libprelude/prelude-error.h
/usr/include/libprelude/prelude-error.hxx
/usr/include/libprelude/prelude-extract.h
/usr/include/libprelude/prelude-failover.h
/usr/include/libprelude/prelude-hash.h
/usr/include/libprelude/prelude-ident.h
/usr/include/libprelude/prelude-inttypes.h
/usr/include/libprelude/prelude-io.h
/usr/include/libprelude/prelude-linked-object.h
/usr/include/libprelude/prelude-list.h
/usr/include/libprelude/prelude-log.h
/usr/include/libprelude/prelude-log.hxx
/usr/include/libprelude/prelude-message-id.h
/usr/include/libprelude/prelude-msg.h
/usr/include/libprelude/prelude-msgbuf.h
/usr/include/libprelude/prelude-option-wide.h
/usr/include/libprelude/prelude-option.h
/usr/include/libprelude/prelude-plugin.h
/usr/include/libprelude/prelude-string.h
/usr/include/libprelude/prelude-thread.h
/usr/include/libprelude/prelude-timer.h
/usr/include/libprelude/prelude.h
/usr/include/libprelude/prelude.hxx