libxau-dev 1:1.0.1-2 (amd64 binary) in ubuntu feisty

 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://xorg.freedesktop.org>
 <URL:http://lists.freedesktop.org/mailman/listinfo/xorg>
 .
 This module can be found as the module 'lib/Xau' at
 :pserver:anoncvs@cvs.freedesktop.org:/cvs/xorg