XML::LibXML->load_xml is only available in XML::LibXML 1.70. you should
either require that version or not use that function.
Running Build test
t/XML-LibXML-Overlay.t .. 1/16 Can't locate object method "load_xml" via
package "XML::LibXML::Overlay" at
/home/jk/.cpan/build/XML-LibXML-Overlay-0.1-5m8u2H/blib/lib/XML/LibXML/Overlay.pm
line 13.
# Looks like you planned 16 tests but ran 2.
(with XML::LibXML 1.69)