/usr/share/common-lisp/source/ is in cl-aserve 1.2.42+cvs.2010.02.08-dfsg-1.2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/common-lisp/source/cl-aserve/
/usr/share/common-lisp/source/cl-aserve/aserve.asd
/usr/share/common-lisp/source/cl-aserve/authorize.cl
/usr/share/common-lisp/source/cl-aserve/cgi.cl
/usr/share/common-lisp/source/cl-aserve/client.cl
/usr/share/common-lisp/source/cl-aserve/decode.cl
/usr/share/common-lisp/source/cl-aserve/defsys.cl
/usr/share/common-lisp/source/cl-aserve/example.cl
/usr/share/common-lisp/source/cl-aserve/headers.cl
/usr/share/common-lisp/source/cl-aserve/load.cl
/usr/share/common-lisp/source/cl-aserve/loadonly.cl
/usr/share/common-lisp/source/cl-aserve/log.cl
/usr/share/common-lisp/source/cl-aserve/macs.cl
/usr/share/common-lisp/source/cl-aserve/main.cl
/usr/share/common-lisp/source/cl-aserve/packages.cl
/usr/share/common-lisp/source/cl-aserve/parse.cl
/usr/share/common-lisp/source/cl-aserve/proxy.cl
/usr/share/common-lisp/source/cl-aserve/publish.cl