x11proto-randr-dev 1.2.1-2 (amd64 binary) in ubuntu gutsy

 This package provides the wire protocol for the RandR extension, used to
 change display properties such as resolution, rotation, reflection, et al,
 on the fly.
 .
 More information about X.Org can be found at:
 <URL:http://xorg.freedesktop.org>
 <URL:http://lists.freedesktop.org/mailman/listinfo/xorg>