/usr/include/gimp-2.0/libgimp/gimpbrushmenu.h is in libgimp2.0-dev 2.8.16-1ubuntu1.
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 54 55 56 57 | /* LIBGIMP - The GIMP Library
 * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
 *
 * gimpbrushmenu.h
 *
 * This library is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 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
 * Lesser 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, see
 * <http://www.gnu.org/licenses/>.
 */
#if !defined (__GIMP_UI_H_INSIDE__) && !defined (GIMP_COMPILATION)
#error "Only <libgimp/gimpui.h> can be included directly."
#endif
#ifndef __GIMP_BRUSH_MENU_H__
#define __GIMP_BRUSH_MENU_H__
/*  These functions are deprecated and should not be used in newly
 *  written code.
 */
#ifndef GIMP_DISABLE_DEPRECATED
G_BEGIN_DECLS
GtkWidget * gimp_brush_select_widget_new   (const gchar          *title,
                                            const gchar          *brush_name,
                                            gdouble               opacity,
                                            gint                  spacing,
                                            GimpLayerModeEffects  paint_mode,
                                            GimpRunBrushCallback  callback,
                                            gpointer              data);
void        gimp_brush_select_widget_close (GtkWidget            *widget);
void        gimp_brush_select_widget_set   (GtkWidget            *widget,
                                            const gchar          *brush_name,
                                            gdouble               opacity,
                                            gint                  spacing,
                                            GimpLayerModeEffects  paint_mode);
G_END_DECLS
#endif /*  GIMP_DISABLE_DEPRECATED  */
#endif /* __GIMP_BRUSH_MENU_H__ */
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