libx11-xcb-dev - 2:1.6.7-1+deb10u2 main

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.
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This package contains the development headers for the library found in
libx11-xcb1. Non-developers likely have little use for this package.
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More information about X.Org can be found at:

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More information about XCB can be found at:

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This module can be found at
git://anongit.freedesktop.org/git/xorg/lib/libX11