Unfortunately kio_perldoc has been masked with the following information:

# Jeremy Olexa <darkside@gentoo.org> (02 Dec 2008)
# Removed in 30 days at maintainer's request. No interest and doesn't 
+work with
# newer gcc versions. bug #249308
kde-misc/kio_perldoc
[download]

Might be worth some additional investigation before installation!