/usr/share/scheme48-1.9/big/ is in scheme48 1.9-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/scheme48-1.9/big/array.scm
/usr/share/scheme48-1.9/big/big-util.scm
/usr/share/scheme48-1.9/big/callback.scm
/usr/share/scheme48-1.9/big/check.scm
/usr/share/scheme48-1.9/big/compact-table.scm
/usr/share/scheme48-1.9/big/compose-cont.scm
/usr/share/scheme48-1.9/big/constant-table-check.scm
/usr/share/scheme48-1.9/big/constant-table.scm
/usr/share/scheme48-1.9/big/defrecord.scm
/usr/share/scheme48-1.9/big/destructure.scm
/usr/share/scheme48-1.9/big/dump.scm
/usr/share/scheme48-1.9/big/dynamic-external.scm
/usr/share/scheme48-1.9/big/either.scm
/usr/share/scheme48-1.9/big/enum-set.scm
/usr/share/scheme48-1.9/big/filename.scm
/usr/share/scheme48-1.9/big/finite-type.scm
/usr/share/scheme48-1.9/big/format.scm
/usr/share/scheme48-1.9/big/general-table.scm
/usr/share/scheme48-1.9/big/hilbert.scm
/usr/share/scheme48-1.9/big/import-def.scm
/usr/share/scheme48-1.9/big/inversion-list-check.scm
/usr/share/scheme48-1.9/big/inversion-list.scm
/usr/share/scheme48-1.9/big/iterate.scm
/usr/share/scheme48-1.9/big/libscheme48.scm
/usr/share/scheme48-1.9/big/linked-queue.scm
/usr/share/scheme48-1.9/big/lock.scm
/usr/share/scheme48-1.9/big/lu-decomp.scm
/usr/share/scheme48-1.9/big/mask.scm
/usr/share/scheme48-1.9/big/matcher-check.scm
/usr/share/scheme48-1.9/big/matcher.scm
/usr/share/scheme48-1.9/big/more-port.scm
/usr/share/scheme48-1.9/big/mvlet.scm
/usr/share/scheme48-1.9/big/os-time-check.scm
/usr/share/scheme48-1.9/big/os-time.scm
/usr/share/scheme48-1.9/big/pipe.scm
/usr/share/scheme48-1.9/big/placeholder.scm
/usr/share/scheme48-1.9/big/pp.scm
/usr/share/scheme48-1.9/big/queue-check.scm
/usr/share/scheme48-1.9/big/queue.scm
/usr/share/scheme48-1.9/big/random.scm
/usr/share/scheme48-1.9/big/reinitializer.scm
/usr/share/scheme48-1.9/big/search-tree.scm
/usr/share/scheme48-1.9/big/shared-object.scm
/usr/share/scheme48-1.9/big/signal.scm
/usr/share/scheme48-1.9/big/strong.scm
/usr/share/scheme48-1.9/big/tconc-queue-check.scm
/usr/share/scheme48-1.9/big/tconc-queue.scm
/usr/share/scheme48-1.9/big/test-suite.scm
/usr/share/scheme48-1.9/big/text-codec-util.scm
/usr/share/scheme48-1.9/big/tlc-table-check.scm
/usr/share/scheme48-1.9/big/tlc-table.scm
/usr/share/scheme48-1.9/big/transport-link-cell-check.scm
/usr/share/scheme48-1.9/big/unicode-normalization-info.scm
/usr/share/scheme48-1.9/big/unicode-normalization.scm
/usr/share/scheme48-1.9/big/value-pipe.scm
/usr/share/scheme48-1.9/big/vararg.scm