- - Mail::Thread (2.5+) libmail-thread-perl
- - URI::Escape liburi-perl
- - XML::Atom::SimpleFeed libxml-atom-simplefeed-perl
+
+Optional modules:
+
+ - CGI[1] perl-modules[2]
+ - Mail::Thread (2.5+)[1] libmail-thread-perl
+ - URI::Escape[1] liburi-perl
+ - XML::Atom::SimpleFeed[1] libxml-atom-simplefeed-perl
+ - Search::Xapian[3] libsearch-xapian-perl
+ - IO::Compress::Gzip[3] libio-compress-perl