/usr/share/common-lisp/source/ is in cl-xlunit 0.6.3-2.
This file is owned by root:root, with mode 0o755.
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/usr/share/common-lisp/source/xlunit/
/usr/share/common-lisp/source/xlunit/assert.lisp
/usr/share/common-lisp/source/xlunit/example.lisp
/usr/share/common-lisp/source/xlunit/fixture.lisp
/usr/share/common-lisp/source/xlunit/listener.lisp
/usr/share/common-lisp/source/xlunit/package.lisp
/usr/share/common-lisp/source/xlunit/printer.lisp
/usr/share/common-lisp/source/xlunit/result.lisp
/usr/share/common-lisp/source/xlunit/suite.lisp
/usr/share/common-lisp/source/xlunit/tcase.lisp
/usr/share/common-lisp/source/xlunit/tests.lisp
/usr/share/common-lisp/source/xlunit/textui.lisp
/usr/share/common-lisp/source/xlunit/xlunit.asd