/usr/include/postgresql/10/server/access/ is in postgresql-server-dev-10 10.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/postgresql/10/server/access/amapi.h
/usr/include/postgresql/10/server/access/amvalidate.h
/usr/include/postgresql/10/server/access/attnum.h
/usr/include/postgresql/10/server/access/brin.h
/usr/include/postgresql/10/server/access/brin_internal.h
/usr/include/postgresql/10/server/access/brin_page.h
/usr/include/postgresql/10/server/access/brin_pageops.h
/usr/include/postgresql/10/server/access/brin_revmap.h
/usr/include/postgresql/10/server/access/brin_tuple.h
/usr/include/postgresql/10/server/access/brin_xlog.h
/usr/include/postgresql/10/server/access/bufmask.h
/usr/include/postgresql/10/server/access/clog.h
/usr/include/postgresql/10/server/access/commit_ts.h
/usr/include/postgresql/10/server/access/genam.h
/usr/include/postgresql/10/server/access/generic_xlog.h
/usr/include/postgresql/10/server/access/gin.h
/usr/include/postgresql/10/server/access/gin_private.h
/usr/include/postgresql/10/server/access/ginblock.h
/usr/include/postgresql/10/server/access/ginxlog.h
/usr/include/postgresql/10/server/access/gist.h
/usr/include/postgresql/10/server/access/gist_private.h
/usr/include/postgresql/10/server/access/gistscan.h
/usr/include/postgresql/10/server/access/gistxlog.h
/usr/include/postgresql/10/server/access/hash.h
/usr/include/postgresql/10/server/access/hash_xlog.h
/usr/include/postgresql/10/server/access/heapam.h
/usr/include/postgresql/10/server/access/heapam_xlog.h
/usr/include/postgresql/10/server/access/hio.h
/usr/include/postgresql/10/server/access/htup.h
/usr/include/postgresql/10/server/access/htup_details.h
/usr/include/postgresql/10/server/access/itup.h
/usr/include/postgresql/10/server/access/multixact.h
/usr/include/postgresql/10/server/access/nbtree.h
/usr/include/postgresql/10/server/access/nbtxlog.h
/usr/include/postgresql/10/server/access/parallel.h
/usr/include/postgresql/10/server/access/printsimple.h
/usr/include/postgresql/10/server/access/printtup.h
/usr/include/postgresql/10/server/access/reloptions.h
/usr/include/postgresql/10/server/access/relscan.h
/usr/include/postgresql/10/server/access/rewriteheap.h
/usr/include/postgresql/10/server/access/rmgr.h
/usr/include/postgresql/10/server/access/rmgrlist.h
/usr/include/postgresql/10/server/access/sdir.h
/usr/include/postgresql/10/server/access/skey.h
/usr/include/postgresql/10/server/access/slru.h
/usr/include/postgresql/10/server/access/spgist.h
/usr/include/postgresql/10/server/access/spgist_private.h
/usr/include/postgresql/10/server/access/spgxlog.h
/usr/include/postgresql/10/server/access/stratnum.h
/usr/include/postgresql/10/server/access/subtrans.h
/usr/include/postgresql/10/server/access/sysattr.h
/usr/include/postgresql/10/server/access/timeline.h
/usr/include/postgresql/10/server/access/transam.h
/usr/include/postgresql/10/server/access/tsmapi.h
/usr/include/postgresql/10/server/access/tupconvert.h
/usr/include/postgresql/10/server/access/tupdesc.h
/usr/include/postgresql/10/server/access/tupmacs.h
/usr/include/postgresql/10/server/access/tuptoaster.h
/usr/include/postgresql/10/server/access/twophase.h
/usr/include/postgresql/10/server/access/twophase_rmgr.h
/usr/include/postgresql/10/server/access/valid.h
/usr/include/postgresql/10/server/access/visibilitymap.h
/usr/include/postgresql/10/server/access/xact.h
/usr/include/postgresql/10/server/access/xlog.h
/usr/include/postgresql/10/server/access/xlog_internal.h
/usr/include/postgresql/10/server/access/xlogdefs.h
/usr/include/postgresql/10/server/access/xloginsert.h
/usr/include/postgresql/10/server/access/xlogreader.h
/usr/include/postgresql/10/server/access/xlogrecord.h
/usr/include/postgresql/10/server/access/xlogutils.h