Internal Program Version:  xcb-proto 1.8  (The HEADER-Files)

xcb-proto contains descriptions of the X Window System core protocol
and selected extensions in an XML-based data format. The X C Binding
(XCB) library uses these descriptions to generate much of its code.
You only need this package if you want to compile XCB or otherwise
make use of these protocol descriptions.

http://xcb.freedesktop.org