nx-x11proto-composite-dev 2:3.5.99.21-1 (armhf binary) in ubuntu eoan

 NX is a software suite which implements very efficient
 compression of the X11 protocol. This increases performance when
 using X applications over a network, especially a slow one.
 .
 This package provides development headers describing the wire protocol
 for the Composite extension in nx-X11, used to let arbitrary client
 programs control drawing of the final image.