libevent-1.4-2 1.4.9-stable-1 (powerpc binary) in ubuntu karmic

 The libevent API provides a mechanism to execute a callback function
 when a specific event occurs on a file descriptor or after a timeout
 has been reached.
 .
 libevent is meant to replace the asynchronous event loop found in
 event driven network servers. Currently, libevent supports /dev/poll,
 kqueue(2), event ports, select(2), poll(2) and epoll(4).
 .
 For backward compatibility and to transition to libevent_core only or
 libevent_core and libevent_extra, the libevent source package builds
 the libevent library that includes everything in libevent_core and
 libevent_extra.