From the docs for XML::Parser:

This module provides ways to parse XML documents. It is built on top o
+f XML::Parser::Expat, which is a lower level interface to James Clark
+’s expat library.
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which means you must have the expat library for XML::Parser to work. On my linux system, the library is called libexpat.so.0.5.0 which is available through a link as libexpat.so. If you want to use the module, you must find a library (or source for it) for your platform.

Phil