libtevent-dev 0.11.0-0ubuntu0.20.04.1 (amd64 binary) in ubuntu focal

 tevent is a simple library that can handle the main event loop for an
 application. It supports three kinds of events: timed events, file
 descriptors becoming readable or writable and signals.
 .
 Talloc is used for memory management, both internally and for private
 data provided by users of the library.
 .
 This package provides the development files.