ActiveState is not the only source of PPM packages. Authors often include README files in the hope that people might bother to READIT. If you did you would note that the ever helpful Randy Kobes has a ppm for it at his repository http://theoryx5.uwinnipeg.ca/ppmpackages/ PMs crazyinsomniac also maintains a very useful repository at http://crazyinsomniac.perlmonk.org/perl/ppm/

ppm install http://theoryx5.uwinnipeg.ca/ppmpackages/XML-LibXML.ppd
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