/usr/share/common-lisp/source/ is in cl-nibbles 20170403-1.
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/usr/share/common-lisp/source/nibbles/
/usr/share/common-lisp/source/nibbles/macro-utils.lisp
/usr/share/common-lisp/source/nibbles/nibbles.asd
/usr/share/common-lisp/source/nibbles/package.lisp
/usr/share/common-lisp/source/nibbles/rt.lisp
/usr/share/common-lisp/source/nibbles/sbcl-opt/
/usr/share/common-lisp/source/nibbles/sbcl-opt/fndb.lisp
/usr/share/common-lisp/source/nibbles/sbcl-opt/nib-tran.lisp
/usr/share/common-lisp/source/nibbles/sbcl-opt/x86-64-vm.lisp
/usr/share/common-lisp/source/nibbles/sbcl-opt/x86-vm.lisp
/usr/share/common-lisp/source/nibbles/streams.lisp
/usr/share/common-lisp/source/nibbles/tests.lisp
/usr/share/common-lisp/source/nibbles/types.lisp
/usr/share/common-lisp/source/nibbles/vectors.lisp