Binary package “libnx-x11-dev” in ubuntu focal

nxagent's libNX_X11 client-part library (development headers)

 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 of the libNX_X11 library (a
 libX11 drop-in replacement used by nxagent).