xmltv_prereq is a package of several perl modules required to build and
run xmltv. Many of these are now available from SlackBuilds.org, to
prevent conflicts you should remove any of the modules you have installed
separately from the modules list in xmltv_prereq.SlackBuild.
The package includes the following modules by default:

 Class-MethodMaker-2.09   DateManip-5.44   HTML-Parser-3.56
 HTML-TableExtract-2.1   HTML-Tagset-3.10   HTML-Tree-3.23
 libwww-perl-5.805   Lingua-EN-Numbers-Ordinate-1.02   Lingua-Preferred-0.2.4
 PerlIO-gzip-0.18   SOAP-Lite-0.69   Term-ProgressBar-2.09
 TermReadKey-2.30   Tk-804.027   Tk-TableMatrix-1.23   Unicode-String-2.09
 WWW-Mechanize-1.20   XML-LibXML-1.62   XML-LibXML-Common-0.13
 XML-NamespaceSupport-1.09   XML-SAX-0.15   XML-Twig-3.29   XML-Writer-0.602

Requires Compress-Zlib available at SlackBuilds.org