libxau-dev 1:1.0.8-1 (i386 binary) in ubuntu bionic

 This package provides the main interface to the X11 authorisation handling,
 which controls authorisation for X connections, both client-side and
 server-side.
 .
 This package contains the development headers for the library found in libxau6.
 Non-developers likely have little use for this package.
 .
 More information about X.Org can be found at:
 <URL:http://www.X.org>
 .
 This module can be found at
 git://anongit.freedesktop.org/git/xorg/lib/libXau