/usr/include/postgres-xc/server/utils/ is in postgres-xc-server-dev 1.1-2ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/postgres-xc/server/utils/acl.h
/usr/include/postgres-xc/server/utils/array.h
/usr/include/postgres-xc/server/utils/ascii.h
/usr/include/postgres-xc/server/utils/attoptcache.h
/usr/include/postgres-xc/server/utils/builtins.h
/usr/include/postgres-xc/server/utils/bytea.h
/usr/include/postgres-xc/server/utils/cash.h
/usr/include/postgres-xc/server/utils/catcache.h
/usr/include/postgres-xc/server/utils/combocid.h
/usr/include/postgres-xc/server/utils/date.h
/usr/include/postgres-xc/server/utils/datetime.h
/usr/include/postgres-xc/server/utils/datum.h
/usr/include/postgres-xc/server/utils/dynahash.h
/usr/include/postgres-xc/server/utils/dynamic_loader.h
/usr/include/postgres-xc/server/utils/elog.h
/usr/include/postgres-xc/server/utils/errcodes.h
/usr/include/postgres-xc/server/utils/fmgroids.h
/usr/include/postgres-xc/server/utils/fmgrtab.h
/usr/include/postgres-xc/server/utils/formatting.h
/usr/include/postgres-xc/server/utils/geo_decls.h
/usr/include/postgres-xc/server/utils/guc.h
/usr/include/postgres-xc/server/utils/guc_tables.h
/usr/include/postgres-xc/server/utils/help_config.h
/usr/include/postgres-xc/server/utils/hsearch.h
/usr/include/postgres-xc/server/utils/inet.h
/usr/include/postgres-xc/server/utils/int8.h
/usr/include/postgres-xc/server/utils/inval.h
/usr/include/postgres-xc/server/utils/json.h
/usr/include/postgres-xc/server/utils/logtape.h
/usr/include/postgres-xc/server/utils/lsyscache.h
/usr/include/postgres-xc/server/utils/memutils.h
/usr/include/postgres-xc/server/utils/nabstime.h
/usr/include/postgres-xc/server/utils/numeric.h
/usr/include/postgres-xc/server/utils/palloc.h
/usr/include/postgres-xc/server/utils/pg_crc.h
/usr/include/postgres-xc/server/utils/pg_crc_tables.h
/usr/include/postgres-xc/server/utils/pg_locale.h
/usr/include/postgres-xc/server/utils/pg_lzcompress.h
/usr/include/postgres-xc/server/utils/pg_rusage.h
/usr/include/postgres-xc/server/utils/plancache.h
/usr/include/postgres-xc/server/utils/portal.h
/usr/include/postgres-xc/server/utils/probes.h
/usr/include/postgres-xc/server/utils/ps_status.h
/usr/include/postgres-xc/server/utils/rangetypes.h
/usr/include/postgres-xc/server/utils/rbtree.h
/usr/include/postgres-xc/server/utils/rel.h
/usr/include/postgres-xc/server/utils/relcache.h
/usr/include/postgres-xc/server/utils/relmapper.h
/usr/include/postgres-xc/server/utils/reltrigger.h
/usr/include/postgres-xc/server/utils/resowner.h
/usr/include/postgres-xc/server/utils/selfuncs.h
/usr/include/postgres-xc/server/utils/snapmgr.h
/usr/include/postgres-xc/server/utils/snapshot.h
/usr/include/postgres-xc/server/utils/sortsupport.h
/usr/include/postgres-xc/server/utils/spccache.h
/usr/include/postgres-xc/server/utils/syscache.h
/usr/include/postgres-xc/server/utils/timestamp.h
/usr/include/postgres-xc/server/utils/tqual.h
/usr/include/postgres-xc/server/utils/tuplesort.h
/usr/include/postgres-xc/server/utils/tuplestore.h
/usr/include/postgres-xc/server/utils/typcache.h
/usr/include/postgres-xc/server/utils/tzparser.h
/usr/include/postgres-xc/server/utils/uuid.h
/usr/include/postgres-xc/server/utils/varbit.h
/usr/include/postgres-xc/server/utils/xml.h