libxml2
auf Solaris: 2.4.23
auf Linux: 2.6.7

Würde eher ungern zu Hammer und Meißel zurückkehren wenn mir einer ne Hilti unter die Nase hält :cool:
Insbesondere "Versions prior to 2.6.8 are known to be broken for various reasons, versions" läßt mich vermuten daß sich da einiges aus gutem Grund geändert hat...

aus der README von XML::LibXML-1.62:

IMPORTANT NOTES
===============

XML::LibXML was almost entirely reimplemented between version 1.40 to version
1.49. This may cause problems on some production machines. With version 1.50 a
lot of compatibility fixes were applied, so programs written for XML::LibXML
1.40 or less should run with version 1.50 again.

In 1.59, a new callback API was introduced. This new API is not compatible with
the previous one. See XML::LibXML::InputCallback manual page for details.

In 1.61 the XML::LibXML::XPathContext module, previously distributed
separately, was merged in.
[...]
As of XML::LibXML 1.61, only versions 2.6.16 and higher are supported.
XML::LibXML will probably not compile with earlier libxml2 versions than 2.5.6.
Versions prior to 2.6.8 are known to be broken for various reasons, versions
prior to 2.1.16 exhibit problems with namespaced attributes and do not
therefore pass XML::LibXML regression tests.