libX11-xcb provides functions needed by clients which take advantage of Xlib/XCB to mix calls to both Xlib and XCB over the same X connection. . This package contains the development headers for the library found in libx11-xcb1. Non-developers likely have little use for this package. . More information about X.Org can be found at: . More information about XCB can be found at: . This module can be found at git://anongit.freedesktop.org/git/xorg/lib/libX11