Several required perl modules may missing on the host, for example the Text::ParseWords, Thread::Queue and Data::Dumper are not installed by default on recent Fedora releases (19 and 20 AFAIK). There would be wild errors if they don't exist, we can check them in sanity.bbclass, more info: https://www.yoctoproject.org/docs/current/yocto-project-qs/yocto-project-qs.html
Merged into master: http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=8b576acb215b091bd3836aa4fc6022e7e408c420