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/usr/include/X11/extensions/XLbx.h is in libxext-dev 2:1.3.0-3ubuntu0.2.

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/*
 * Copyright 1992 Network Computing Devices
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of NCD. not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  NCD. makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * NCD. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NCD.
 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */
 
#ifndef _XLBX_H_
#define _XLBX_H_

#include <X11/Xfuncproto.h>
#include <X11/Xdefs.h>
#include <X11/Xlib.h>
#include <X11/extensions/lbx.h>

_XFUNCPROTOBEGIN

Bool XLbxQueryExtension(
    Display*		/* dpy */,
    int*		/* requestp */,
    int*		/* event_basep */,
    int*		/* error_basep */
);

Bool XLbxQueryVersion(
    Display*		/* dpy */,
    int*		/* majorVersion */,
    int*		/* minorVersion */
);

int XLbxGetEventBase(Display *dpy);

_XFUNCPROTOEND

#endif