Thanks, mirod and Petruchio. I gave up on trying to install XML::Parser 2.30, and installed 2.29 instead. It works fine.

I hope that the developers of XML::Parser will return to the pre-2.30 practice of offering a version which has expat built in. Some people want to use XML and perl but are not experts in module and C library installation.

Including expat for those who want it seems like the perlish thing to do.