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libevent is a combination of libevent_core and libevent_extra. Mesos/libprocess does not make use of any libevent_extra functionality and additionally it appears that its use is against best practices.
From http://www.wangafu.net/~nickm/libevent-book/Ref0_meta.html:
libevent This library exists for historical reasons; it contains the contents of both libevent_core and libevent_extra. You shouldn’t use it; it may go away in a future version of Libevent.
We should adapt our linkage accordingly.