Ikiwiki requires the [[!cpan Text::Markdown::Discount]] (or
[[!cpan Text::Markdown]]), [[!cpan URI]],
-[[!cpan HTML::Parser]], [[!cpan HTML::Template]], and [[!cpan HTML::Scrubber]]
-perl modules be installed. It can also use a lot of other perl modules, if
+[[!cpan HTML::Parser]], [[!cpan HTML::Template]], [[!cpan YAML::XS]] and [[!cpan HTML::Scrubber]]
+perl modules be installed.
+It can also use a lot of other perl modules, if
they are available.
Various [[plugins]] use other perl modules and utilities; see their individual