libexo-1-dev 0.12.2-1 (arm64 binary) in ubuntu cosmic

 libexo is a library for Xfce that contains a bunch of additional widgets and
 a framework for editable toolbars (an improved version of the framework
 present in GNOME), light-weight session management support, functions to
 automatically synchronize object properties (based on GObject Binding
 Properties) and several miscellaneous utility and helper functions for
 application developers.
 .
 This package contains the headers and the static library
 for libexo-1-0.