Binary package “x11proto-composite-dev” in ubuntu xenial

X11 Composite extension wire protocol

 This package provides development headers describing the wire protocol
 for the Composite extension, used to let arbitrary client programs control
 drawing of the final image.
 .
 More information about X.Org can be found at:
 <URL:http://www.X.org>
 .
 This package is built from the X.org compositeproto proto module.