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/usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.0.2/X11-1.8-9LIA1IrKR3LITr8rHkiWyN/include/XlibExtras.h is in libghc-x11-dev 1.8-3.

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/* This file copied from the X11 package */

/* -----------------------------------------------------------------------------
 * Definitions for package `X11' which are visible in Haskell land.
 * ---------------------------------------------------------------------------*
 */

#ifndef XLIBEXTRAS_H
#define XLIBEXTRAS_H
#include <stdlib.h>
/* This doesn't always work, so we play safe below... */
#define XUTIL_DEFINE_FUNCTIONS
#include <X11/X.h>
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include <X11/Xproto.h>

#include <X11/extensions/Xrandr.h>

#ifdef HAVE_X11_EXTENSIONS_SCRNSAVER_H
#include <X11/extensions/scrnsaver.h>
#endif

/* Xutil.h overrides some functions with macros.
 * In recent versions of X this can be turned off with
 *      #define XUTIL_DEFINE_FUNCTIONS
 * before the #include, but this doesn't work with older versions.
 * As a workaround, we undef the macros here.  Note that this is only
 * safe for functions with return type int.
 */
#undef XDestroyImage
#undef XGetPixel
#undef XPutPixel
#undef XSubImage
#undef XAddPixel
#define XK_MISCELLANY
#define XK_LATIN1
#include <X11/keysymdef.h>
#endif

void x11_extras_set_error_handler();
int x11_extras_IsCursorKey(KeySym keysym);
int x11_extras_IsFunctionKey(KeySym keysym);
int x11_extras_IsKeypadKey(KeySym keysym);
int x11_extras_IsMiscFunctionKey(KeySym keysym);
int x11_extras_IsModifierKey(KeySym keysym);
int x11_extras_IsPFKey(KeySym keysym);
int x11_extras_IsPrivateKeypadKey(KeySym keysym);