Do you really need to use XML::Grove? It was one of the first XML::Parser-based module released, but it hasn't been updated this millenium (version 0.46alpha is dated 09 Sep 1999). That might also explain why it fails the tests on a recent perl.

XML::LibXML (based on libxml2), or (shameless plug!) XML::Twig (based on XML::Parser and thus expat) are both well-maintained, and would be better choices these days.