/usr/include/xfce4/libxfce4ui-2/libxfce4ui/libxfce4ui-config.h is in libxfce4ui-2-dev 4.11.1-2ubuntu1.
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 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | /*
 * Copyright (c) 2007 The Xfce Development Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA
 */
#if !defined (LIBXFCE4UI_INSIDE_LIBXFCE4UI_H) && !defined (LIBXFCE4UI_COMPILATION)
#error "Only <libxfce4ui/libxfce4ui.h> can be included directly, this file may disappear or change contents."
#endif
#ifndef __LIBXFCE4UI_CONFIG_H__
#define __LIBXFCE4UI_CONFIG_H__
#include <glib-object.h>
G_BEGIN_DECLS
#define LIBXFCE4UI_MAJOR_VERSION (4)
#define LIBXFCE4UI_MINOR_VERSION (11)
#define LIBXFCE4UI_MICRO_VERSION (1)
#define LIBXFCE4UI_CHECK_VERSION(major,minor,micro) \
  (LIBXFCE4UI_MAJOR_VERSION > (major) \
   || (LIBXFCE4UI_MAJOR_VERSION == (major) \
       && LIBXFCE4UI_MINOR_VERSION > (minor)) \
   || (LIBXFCE4UI_MAJOR_VERSION == (major) \
       && LIBXFCE4UI_MINOR_VERSION == (minor) \
       && LIBXFCE4UI_MICRO_VERSION >= (micro)))
extern const guint libxfce4ui_major_version;
extern const guint libxfce4ui_minor_version;
extern const guint libxfce4ui_micro_version;
const gchar *libxfce4ui_check_version (guint required_major,
                                       guint required_minor,
                                       guint required_micro);
G_END_DECLS
#endif /* !__LIBXFCE4UI_CONFIG_H__ */
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