/usr/share/scheme48-1.9/posix/ is in scheme48 1.9-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/scheme48-1.9/posix/check.scm
/usr/share/scheme48-1.9/posix/dir.scm
/usr/share/scheme48-1.9/posix/errno.scm
/usr/share/scheme48-1.9/posix/file-options.scm
/usr/share/scheme48-1.9/posix/func-regexp.scm
/usr/share/scheme48-1.9/posix/io.scm
/usr/share/scheme48-1.9/posix/packages.scm
/usr/share/scheme48-1.9/posix/proc-env.scm
/usr/share/scheme48-1.9/posix/proc.scm
/usr/share/scheme48-1.9/posix/regexp-check.scm
/usr/share/scheme48-1.9/posix/regexp.scm
/usr/share/scheme48-1.9/posix/signal.scm
/usr/share/scheme48-1.9/posix/syslog.scm
/usr/share/scheme48-1.9/posix/test-packages.scm
/usr/share/scheme48-1.9/posix/time.scm