/usr/include/xfce4/libxfcegui4/gtk_style.h is in libxfcegui4-dev 4.10.0-3.
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 | /*
 * xfce4    - (c) 2002 Olivier Fourdan
 * 
 * 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 Lesser 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
 */
#ifndef __GTKSTYLE_H__
#define __GTKSTYLE_H__
#if defined(LIBXFCEGUI4_COMPILATION) || !defined(XFCE_DISABLE_DEPRECATED)
#include <glib.h>
#include <gtk/gtk.h>
#include <pango/pango-font.h>
G_BEGIN_DECLS
gchar *get_style (GtkWidget *widget, const gchar *name, const gchar *state);
GdkGC *get_style_gc (GtkWidget *widget, const gchar *state, const gchar *style);
PangoFontDescription *get_font_desc (GtkWidget *widget);
PangoContext *pango_get_context (GtkWidget *widget);
G_END_DECLS
#endif /* !XFCE_DISABLE_DEPRECATED */
#endif
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