(Casually wonders why #MacPorts has
#libevent
https://ports.macports.org/port/libevent/ [more or less current with upstream]

and
#libevent1

https://ports.macports.org/port/libevent1/ [what is this doing here? I am so confused. Though obviously has some different things which depend on it such as honeyd, also by Niels Provos. So: maybe old and crufty stuff needs older libevent1?] )