/usr/include/xcb/xcb_util.h is in libxcb-util-dev 0.4.0-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #ifndef __XCB_UTIL_H__
#define __XCB_UTIL_H__
#include <xcb/xcb_atom.h>
#include <xcb/xcb_aux.h>
#include <xcb/xcb_event.h>
#endif /* __XCB_UTIL_H__ */
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