Download
Download a tarball.
Get it from darcs repository:
darcs get http://common-lisp.net/project/plexippus-xpath/darcs/plexippus-xpath/
Installation
Plexippus XPath needs cxml, parse-number, cl-ppcre, and cl-yacc.
ASDF is used for compilation. Register the .asd file, e.g. by symlinking it, then compile Plexippus XPath using asdf:operate.
$ ln -sf `pwd`/xpath.asd /path/to/your/registry/ * (asdf:operate 'asdf:load-op :xpath)