The current version of the perl package PDL that plplot depends on is ""2.4.4_05", unfortunately the version checker in plplot isn't smart enough to recognize that this is greater than the minimum version of 2.4.1:
-- PDL_VERSION = 2.4.4_05
-- WARNING: PDL version < 2.4.1. Disabling Perl/PDL examples in tests
See the downstream Fedora bug: https://bugzilla.redhat.com/show_bug.cgi?id=519357
with a link to the full build log.